Foreword Foreword
The standard has revised GB/T 3077-1988 ”The Technical Conditions of Alloy Structure Steel”. The standard has revised GB/T 3077-1988 ”The Technical Conditions of Alloy Structure Steel”. There have been some changes in this national’s standard over its previous edition in the following There have been some changes in this national’s standard over its previous edition in the following technical aspects:
technical aspects:
-- Change the name of the standard to “Alloy Structure Steel”;Change the name of the standard to “Alloy Structure Steel”;
-- After consultation between the two sides of supply and demand, the bar stock of which the diameterAfter consultation between the two sides of supply and demand, the bar stock of which the diameter is more than 250mm can also be provided;
is more than 250mm can also be provided;
-- Add a chapter of “Order Content”;Add a chapter of “Order Content”;
-- Add the unified digital code for steel grades;Add the unified digital code for steel grades;
-- Cancel steel grades 30Mn2MoW, 20Mn2B, 20SiMnVB, 20Cr3MoWVA, 20CrV and add steel gradeCancel steel grades 30Mn2MoW, 20Mn2B, 20SiMnVB, 20Cr3MoWVA, 20CrV and add steel grade 18CrMnNiMoA which was developed by China;
18CrMnNiMoA which was developed by China;
-- Add the maximum content limit for Mo;Add the maximum content limit for Mo;
-- Delete the clauses 3.1.1.3, 3.1.1.5, 3.5.2.1 and 3.5.2.2 of GB/T 3077-1988;Delete the clauses 3.1.1.3, 3.1.1.5, 3.5.2.1 and 3.5.2.2 of GB/T 3077-1988;
-- Adjust appropriately the heat treatment process of Table 3 and the heat treatment parameters ofAdjust appropriately the heat treatment process of Table 3 and the heat treatment parameters of individual steel grades.
individual steel grades.
The standard will replace GB/T 3077-1988 from the date of the implementation of this standard. The standard will replace GB/T 3077-1988 from the date of the implementation of this standard. The standard was proposed by the State Bureau of Metallurgical Industry.
The standard was proposed by the State Bureau of Metallurgical Industry.
The standard is under the jurisdiction of the National Technical Committee of Standardization Steel. The standard is under the jurisdiction of the National Technical Committee of Standardization Steel. The standard was mainly drafted by the following organizations: Daye Special Steel Co., Ltd., the The standard was mainly drafted by the following organizations: Daye Special Steel Co., Ltd., the Standards Research Institute of Ministry of Metallurgical, and Baoshan Iron & Steel Co., Ltd. Special Standards Research Institute of Ministry of Metallurgical, and Baoshan Iron & Steel Co., Ltd. Special Steel Branch.
Steel Branch.
The standard was mainly drafted by: Mr. Fang Jun, Mr. Liu Wende, Ms. Luan Yan, Mr. Han Guoliang The standard was mainly drafted by: Mr. Fang Jun, Mr. Liu Wende, Ms. Luan Yan, Mr. Han Guoliang and Mr. Chen Changxi.
and Mr. Chen Changxi.
The standards was first released in May 1982 release and first emended in February 1988. The standards was first released in May 1982 release and first emended in February 1988.
National Standa
National Standard of
rd of PRC
PRC
Alloy Structure Steels
Alloy Structure Steels
GB/T 3077-1999
GB/T 3077-1999
Replace GB/T 3077-1988
Replace GB/T 3077-1988
1. Scope
1. Scope
The standard covers the following issues of hot rolled and forging alloy steel: the dimension, shape, The standard covers the following issues of hot rolled and forging alloy steel: the dimension, shape, weight, tolerance, engineering specification, test method, inspection rules, packaging, marking, and weight, tolerance, engineering specification, test method, inspection rules, packaging, marking, and quality certificates.
quality certificates.
The standard applies to alloy structural steel bar 250mm maximum diameter or thickness. After The standard applies to alloy structural steel bar 250mm maximum diameter or thickness. After
consultation between the two sides of supply and demand, bar stock of diameter greater than 250 mm consultation between the two sides of supply and demand, bar stock of diameter greater than 250 mm can also be provided
can also be provided
The chemical compositions of steel grades specified in the standard also apply to steel ingot, billet and The chemical compositions of steel grades specified in the standard also apply to steel ingot, billet and its productions.
its productions.
2. Normative reference
2. Normative reference
The following standards contain provisions, which through reference in this text constitute provisions of The following standards contain provisions, which through reference in this text constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to this standard. At time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this standard are encouraged to investigate the possibility revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
of applying the most recent editions of the standards indicated below.
GB/T 222-1984
GB/T 222-1984 Method of sampling steel for determination of chemical composition andMethod of sampling steel for determination of chemical composition and permissible variations for product analysis
permissible variations for product analysis GB/T
GB/T 224-1984 224-1984 Determination Determination of of depth depth of of decarburizatiodecarburization n of of steelsteel GB/T
GB/T 225-1988 225-1988 Methods Methods of of Harden Harden ability ability Test Test for for Steel Steel End End Quench Quench MethodMethod GB/T
GB/T 226-1991 226-1991 Etch Etch test test for for macrostructure macrostructure and and defect defect of of steelssteels GB/T
GB/T 228-1987 228-1987 Methods Methods of of tensile tensile tests tests for for metalmetal GB/T
GB/T 229-1994 229-1994 Metallic Metallic materials—Charpy materials—Charpy notch notch impact impact testtest GB/T231-1984
GB/T231-1984 Metallic Metallic materials—Brinell materials—Brinell Hardness Hardness testtest GB/T233-1982
GB/T233-1982 Metallic Metallic materials—Forging materials—Forging testtest GB/T702-1986
GB/T702-1986 Hot-rolled round and square steel bars—Dimension, shape, weight andHot-rolled round and square steel bars—Dimension, shape, weight and tolerance
tolerance
GB/T
GB/T 908-1987 908-1987 Forged Forged round round and and square square steels steels dimension, dimension, shape, shape, weight weight and and tolerancetolerance GB/T1979-1980
GB/T1979-1980 Diagram Diagram of of a a low low magnification magnification texture texture blemish blemish grading grading of of structural structural steelsteel GB/T2101-1989
GB/T2101-1989 General requirements of acceptance, packaging, marking, and certification forGeneral requirements of acceptance, packaging, marking, and certification for section steel
section steel GB/T2975-1998
GB/T2975-1998 Steel and steel products--Location and preparation of test pieces forSteel and steel products--Location and preparation of test pieces for mechanical testing
mechanical testing GB/T4336-1984
GB/T4336-1984 Method for photoelectric emission spectroscopic analysis of carbon steel,Method for photoelectric emission spectroscopic analysis of carbon steel, medium and low alloy steel
medium and low alloy steel GB/T6397-1986
GB/T7736-1987
GB/T7736-1987 Ultrasonic Ultrasonic inspecting inspecting method method for for macro-structure macro-structure and and imperfection imperfection of of steelsteel GB/T10561-1989
GB/T10561-1989 Microscopic Microscopic valuation valuation method method for for the the non-metallic non-metallic inclusions inclusions in in steelsteel GB/T13299-1991
GB/T13299-1991 SteelSteel－－Determination of microstructureDetermination of microstructure
GB/T15711-1995
GB/T15711-1995 Steel Steel products--Method products--Method for for etch etch test test of of tower tower samplesample GB/T17505-1998
GB/T17505-1998 Steel Steel and and steel steel products products General General technical technical delivery delivery requirementsrequirements GB/T17616-1998
GB/T17616-1998 Unified numbering system for designations of iron, steel and alloyUnified numbering system for designations of iron, steel and alloy
YB/T5148-1993
YB/T5148-1993 Metal-methods for estimating the average grain sizeMetal-methods for estimating the average grain size
Normative reference of chemolysis
Normative reference of chemolysis methods of iron and steel please see Annex A. (Normative Annex)methods of iron and steel please see Annex A. (Normative Annex)
3. Order Content
3. Order Content
Order or contract according to this standard should including following content:
Order or contract according to this standard should including following content:
a) Standard Number;
a) Standard Number;
b) Product Name;
b) Product Name;
c) Steel grade or
c) Steel grade orunified digital code;unified digital code;
d) Control of residual elements (For requirements, refer 6.1.1.2);
d) Control of residual elements (For requirements, refer 6.1.1.2);
e) The weight or quantity of delivery;
e) The weight or quantity of delivery;
f) Size and Shape;
f) Size and Shape;
g) Processing methods;
g) Processing methods;
h) Delivery condition;
h) Delivery condition;
i) Delivery with heat treatment condition (For requirements, refer 6.4);
i) Delivery with heat treatment condition (For requirements, refer 6.4);
j) Hot heading (For requirements, refer 6.7);
j) Hot heading (For requirements, refer 6.7);
k) Decarburization (For requirements, refer 6.8);
k) Decarburization (For requirements, refer 6.8);
l) Non-metallic impurities (For requirements, refer 6.9);
l) Non-metallic impurities (For requirements, refer 6.9);
m) Special requirements (For requirements, refer 6.10).
m) Special requirements (For requirements, refer 6.10).
4. Classification and code
4. Classification and code
4.1 By different metallurgical quality, steel divided into the following three categories:
4.1 By different metallurgical quality, steel divided into the following three categories:
a) Fine steel;
a) Fine steel;
b) High-grade fine steel (code “A” added following steel grade);
b) High-grade fine steel (code “A” added following steel grade);
c) Extra fine steel (code “E” added following steel grade).
c) Extra fine steel (code “E” added following steel grade).
4.2 By different using and processing purpose, steel divided into the following two categories. The
applied processing method should be specified in the contract. If it is not specified, cutting used steel is
applied processing method should be specified in the contract. If it is not specified, cutting used steel is
default.
default.
a)
a) Pressure Pressure process used process used steel steel (code: (code: UP)UP)
1)
1) Hot Hot pressure process pressure process used steel used steel (code: UHP(code: UHP))
2)
2) Upset Upset forging forging steel steel (code: (code: UF)UF)
3)
3) Cold Cold drawn drawn steel steel (code: (code: UCD)UCD)
b)
b) Cutting Cutting used used steel steel (code: (code: UC)UC)
5. Size, Shape, Weight and Tolerance
5. Size, Shape, Weight and Tolerance
5.1 The size, shape weight and tolerance of hot-rolled bar and square steel should be consistent with the
5.1 The size, shape weight and tolerance of hot-rolled bar and square steel should be consistent with the
relevant regulation of GB/T 702, and the particular requirements should be specified in the contract.
relevant regulation of GB/T 702, and the particular requirements should be specified in the contract.
5.2 The size, shape weight and tolerance of forged bar and square steel should be consistent with the
5.2 The size, shape weight and tolerance of forged bar and square steel should be consistent with the
relevant regulation of GB/T 908, and the particular requirements should be specified in the contract.
relevant regulation of GB/T 908, and the particular requirements should be specified in the contract.
5.3 The size, shape weight and tolerance of profiled bar should be c
5.3 The size, shape weight and tolerance of profiled bar should be comply with the appropriateomply with the appropriate standards or terms of the agreement reached between supplier and buyer, and the
standards or terms of the agreement reached between supplier and buyer, and theparticularparticular
requirements should be specified in the contract.
requirements should be specified in the contract.
6. Technical specification
6. Technical specification
6.1 Steel grade and chemical composition
6.1 Steel grade and chemical composition
6.1.1 Steel grade, unified digital code and chemical composition (melting analysis) should be consistent
6.1.1 Steel grade, unified digital code and chemical composition (melting analysis) should be consistent
with the specification of Table 1.
with the specification of Table 1.
6.1.1.1 The
6.1.1.1 Thesulfur, phosphorus and residual content of copper, chromium, nickel, molybdenum of steelsulfur, phosphorus and residual content of copper, chromium, nickel, molybdenum of steel should be consistent with the specification of Table 2.
should be consistent with the specification of Table 2.
6.1.1.2 The residual content of tungsten, vanadium, and titanium content should be analyzed, and the 6.1.1.2 The residual content of tungsten, vanadium, and titanium content should be analyzed, and the results should be recorded in the quality certificate. According to the buyer’s request, the restrictions of results should be recorded in the quality certificate. According to the buyer’s request, the restrictions of residual tungsten, vanadium, titanium content can be set up.
residual tungsten, vanadium, titanium content can be set up.
6.1.1.3 The maximum copper content of hot pressure process used steel is 0.2%.
6.1.1.3 The maximum copper content of hot pressure process used steel is 0.2%.
6.1.2 The permissible deviation of chemical composition of steels (or billets) should comply with GB/T
6.1.2 The permissible deviation of chemical composition of steels (or billets) should comply with GB/T
222.
Table 1
Table 1
Chemical Composition % Chemical Composition % Steel Steel GroupGroup I I t t e e m
m UnifiedUnifieddigitaldigital
code code Steel grade Steel grade C Si C Si Mn Mn Cr Cr Mo Mo Ni Ni W W B B Al Al Ti Ti VV 1 A00202 20Mn2 1 A00202 20Mn2 00..1177~~00..2244 00..1177~~00..3377 11..4400~~11..8800 2 A00302 30Mn2 2 A00302 30Mn2 00..2277~~00..3344 00..1177~~00..3377 11..4400~~11..8800 3 A00352 35Mn2 3 A00352 35Mn2 00..3322~~00..3399 00..1177~~00..3377 11..4400~~11..8800 4 A00402 40Mn2 4 A00402 40Mn2 00..3377~~00..4444 00..1177~~00..3377 11..4400~~11..8800 5 A00452 45Mn2 5 A00452 45Mn2 00..4422~~00..4499 00..1177~~00..3377 11..4400~~11..8800 Mn Mn 6 A00502 50Mn2 6 A00502 50Mn2 00..4477~~00..5555 00..1177~~00..3377 11..4400~~11..8800 MnV MnV 7 7 A01202 A01202 20MnV20MnV 00..1177~~00..2244 00..1177~~00..3377 11..3300~~11..660 0 00..0077~~00..1122 8 A10272 27SiMn 8 A10272 27SiMn 00..2244~~00..3322 11..1100~~11..4400 11..1100~~11..4400 9 A10352 35SiMn 9 A10352 35SiMn 00..3322~~00..4400 11..1100~~11..4400 11..1100~~11..4400 SiMn SiMn 10
10 A10422 A10422 42SiMn42SiMn 00..3399~~00..4455 11..1100~~11..4400 1.1.1100~~11..4400
11
11 A14202 A14202 20SiMn2MoV20SiMn2MoV 00.1.177~0~0.2.233 0.0.990~0~1.1.2020 2.202.20~2~2..660 0 0.0.3030~~0.0.440 0 0.0.0505~~0.0.1212
12
12 A14262 A14262 25SiMn2MoV25SiMn2MoV 00.2.222~0~0.2.288 0.0.990~0~1.1.2020 2.202.20~2~2..660 0 0.0.3030~~0.0.440 0 0.0.0505~~0.0.1212
SiMnMoV SiMnMoV
13
13 A14372 A14372 37SiMn2MoV37SiMn2MoV 00.3.333~0~0.3.399 0.0.660~0~0.0.9090 1.601.60~1~1..990 0 0.0.4040~~0.0.550 0 0.0.0505~~0.0.1212
14 14 A70402 A70402 40B40B 00..3377~~00..4444 00..1177~~00..3377 00..6600~~00..990 0 00..00000055~~00..00003355 15 15 A70452 A70452 45B45B 00..4422~~00..4499 00..1177~~00..3377 00..6600~~00..990 0 00..00000055~~00..00003355 B B 16 16 A70502 A70502 50B50B 00..4477~~00..5555 00..1177~~00..3377 00..6600~~00..990 0 00..00000055~~00..00003355 17 17 A71402 A71402 40MnB40MnB 00..3377~~00..4444 00..1177~~00..3377 11..1100~~11..440 0 00..00000055~~00..00003355 MnB MnB 18 18 A71452 A71452 45MnB45MnB 00..4422~~00..4499 00..1177~~00..3377 11..1100~~11..440 0 00..00000055~~00..00003355 MnMoB
MnMoB 19 19 A72202 A72202 20MnMoB20MnMoB 00.1.166~0~0.2.222 0.0.117~7~0.0.3737 0.0.9090~1~1..20 20 0.0.220~0~0.0.330 0 0.0.0000005~5~0.0.00003535
20 20 A73152 A73152 15MnVB15MnVB 00..1122~~00..1188 00..1177~~00..3377 11..2200~~11..660 0 00..00000055~~00..0000335 5 00..0077~~00..1122 21 21 A73202 A73202 20MnVB20MnVB 00..1177~~00..2233 00..1177~~00..3377 11..2200~~11..660 0 00..00000055~~00..0000335 5 00..0077~~00..1122 MnVB MnVB 22 22 A73402 A73402 40MnVB40MnVB 00..3377~~00..4444 00..1177~~00..3377 11..1100~~11..440 0 00..00000055~~00..0000335 5 00..0055~~00..1100 23
23 A74202 A74202 20MnTiB20MnTiB 00..1177~~00..2244 00..1177~~00..3377 11..3300~~11..660 0 00..00000055~~00..0000335 5 00..0044~~00..1100
MnTiB MnTiB
24
24 A74252 A74252 25MnTiBRE25MnTiBRE 00..2222~~00..2288 00..2200~~00..4455 11..3300~~11..660 0 00..00000055~~00..0000335 5 00..0044~~00..1100
Table 1(continued)
Table 1(continued)
Chemical Composition % Chemical Composition % Steel Steel GroupGroup I I t t e e m m
Unified Unified digital digital code code Steel grade Steel grade C Si C Si Mn Mn Cr Cr Mo Mo Ni Ni W W B B Al Al Ti Ti VV 25 25 A20152 A20152 15Cr15Cr 00..1122~~00..1188 00..1177~~00..3377 00..4400~~00..7700 00..7700~~11..0000 26
26 A20153 A20153 15CrA15CrA 00..1122~~00..1177 00..1177~~00..3377 00..4400~~00..7700 00..7700~~11..0000
27 27 A20202 A20202 20Cr20Cr 00..1188~~00..2244 00..1177~~00..3377 00..5500~~00..8800 00..7700~~11..0000 28 28 A20302 A20302 30Cr30Cr 00..2277~~00..3344 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..1100 29 29 A20352 A20352 35Cr35Cr 00..3322~~00..3399 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..1100 30 30 A20402 A20402 40Cr40Cr 00..3377~~00..4444 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..1100 31 31 A20452 A20452 45Cr45Cr 00..4422~~00..4499 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..1100 Cr Cr 32 32 A20502 A20502 50Cr50Cr 00..4477~~00..5544 11..1100~~11..4400 00..5500~~00..8800 00..8800~~11..1100 CrSi
CrSi 33 33 A21382 A21382 38CrSi38CrSi 00..3355~~00..4433 11..0000~~11..3300 00..3300~~00..6600 11..3300~~11..6600
34
34 A30122 A30122 12CrMo12CrMo 00..0088~~00..1155 00..1177~~00..3377 00..4400~~00..7700 00..4400~~00..7700 00..4400~~00..5555
35
35 A30152 A30152 15CrMo15CrMo 00..1122~~00..1188 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..4400~~00..5555
36
36 A30202 A30202 20CrMo20CrMo 00..1177~~00..2244 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..1155~~00..2255
37
37 A30302 A30302 30CrMo30CrMo 00..2266~~00..3344 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..1155~~00..2255
38
38 A30303 A30303 30CrMoA30CrMoA 00..2266~~00..3333 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..1155~~00..2255
39
39 A30352 A30352 35CrMo35CrMo 00..3322~~00..4400 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..1155~~00..2255
CrMo CrMo
40
Table 1(continued)
Table 1(continued)
Chemical Composition % Chemical Composition % Steel Steel GroupGroup I I t t e e m m
Unified Unified digital digital code code Steel grade Steel grade C Si C Si Mn Mn Cr Cr Mo Mo Ni Ni W W B B Al Al Ti Ti VV 25 25 A20152 A20152 15Cr15Cr 00..1122~~00..1188 00..1177~~00..3377 00..4400~~00..7700 00..7700~~11..0000 26
26 A20153 A20153 15CrA15CrA 00..1122~~00..1177 00..1177~~00..3377 00..4400~~00..7700 00..7700~~11..0000
27 27 A20202 A20202 20Cr20Cr 00..1188~~00..2244 00..1177~~00..3377 00..5500~~00..8800 00..7700~~11..0000 28 28 A20302 A20302 30Cr30Cr 00..2277~~00..3344 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..1100 29 29 A20352 A20352 35Cr35Cr 00..3322~~00..3399 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..1100 30 30 A20402 A20402 40Cr40Cr 00..3377~~00..4444 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..1100 31 31 A20452 A20452 45Cr45Cr 00..4422~~00..4499 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..1100 Cr Cr 32 32 A20502 A20502 50Cr50Cr 00..4477~~00..5544 11..1100~~11..4400 00..5500~~00..8800 00..8800~~11..1100 CrSi
CrSi 33 33 A21382 A21382 38CrSi38CrSi 00..3355~~00..4433 11..0000~~11..3300 00..3300~~00..6600 11..3300~~11..6600
34
34 A30122 A30122 12CrMo12CrMo 00..0088~~00..1155 00..1177~~00..3377 00..4400~~00..7700 00..4400~~00..7700 00..4400~~00..5555
35
35 A30152 A30152 15CrMo15CrMo 00..1122~~00..1188 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..4400~~00..5555
36
36 A30202 A30202 20CrMo20CrMo 00..1177~~00..2244 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..1155~~00..2255
37
37 A30302 A30302 30CrMo30CrMo 00..2266~~00..3344 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..1155~~00..2255
38
38 A30303 A30303 30CrMoA30CrMoA 00..2266~~00..3333 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..1155~~00..2255
39
39 A30352 A30352 35CrMo35CrMo 00..3322~~00..4400 00..1177~~00..3377 00..4400~~00..7700 00..8800~~11..1100 00..1155~~00..2255
CrMo CrMo
40
40 A30422 A30422 42CrMo42CrMo 00..3388~~00..4455 00..1177~~00..3377 00..5500~~00..8800 00..9900~~11..2200 00..1155~~00..2255
41
41 A31122 A31122 12CrMoV12CrMoV 00..0088~~00..1155 0.0.1177~~00..3377 00..4400~~00..7700 00..3300~~00..6600 00..2255~~00..335 5 00..1155~~00..3300
42
42 A31352 A31352 35CrMoV35CrMoV 00..3300~~00..3388 0.0.1177~~00..3377 00..4400~~00..7700 11..0000~~11..3300 00..2200~~00..330 0 00..1100``00..2200
43
43 A31132 A31132 12Cr1MoV12Cr1MoV 00..0088~~00..1155 0.0.1177~~00..3377 00..4400~~00..7700 00..9900~~11..2200 00..2255~~00..335 5 00..1155~~00..3300
44
44 A31253 A31253 25Cr2MoVA25Cr2MoVA 00..2222~~00..2288 0.0.1177~~00..3377 00..4400~~00..7700 11..5500~~11..8800 00..2255~~00..335 5 00..1155~~00..3300
CrMoV CrMoV
45
45 A31263 A31263 25Cr2Mo1VA25Cr2Mo1VA 00..2222~~00..2299 0.0.1177~~00..3377 00..5500~~00..8800 22..1100~~22..5500 00..9900~~11..110 0 00..3300~~00..5500
CrMoAl
CrMoAl 46 46 A33382 A33382 38CrMoAl38CrMoAl 00..3355~~00..4422 00..2200~~00..4455 00..3300~~00..6600 11..3355~~11..6655 00..1155~~00..225 5 00..7700~~11..1100
47
47 A23402 A23402 40CrV40CrV 00..3377~~00..4444 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..110 0 00..1100~~00..2200
CrV CrV
48
48 A23503 A23503 50CrVA50CrVA 00..4477~~00..5544 00..1177~~00..3377 00..5500~~00..8800 00..8800~~11..110 0 00..1100~~00..2200
Table 1(continued)
Table 1(continued)
Chemical Composition % Chemical Composition % Steel Steel GroupGroup I I t t e e m
m UnifiedUnifieddigitaldigital
code code Steel grade Steel grade C Si C Si Mn Mn Cr Cr Mo Mo Ni Ni W W B B Al Al Ti Ti 49 49 A22152 A22152 15CrMn15CrMn 00..1122~~00..1188 00..1177~~00..3377 11..1100~~11..4400 00..4400~~00..7700 50 50 A22202 A22202 20CrMn20CrMn 00..1177~~00..2233 00..1177~~00..3377 00..9900~~11..2200 00..9900~~11..2200 CrMn CrMn 51 51 A22402 A22402 40CrMn40CrMn 00..3377~~00..4455 00..1177~~00..3377 00..9900~~11..2200 00..9900~~11..2200 52
52 A24202 A24202 20CrMnSi20CrMnSi 00..1177~~00..2233 00..9900~~11..2200 00..8800~~11..1100 00..8800~~11..1100
53
53 A24252 A24252 25CrMnSi25CrMnSi 00..2222~~00..2288 00..9900~~11..2200 00..8800~~11..1100 00..8800~~11..1100
54
54 A24302 A24302 30CrMnSi30CrMnSi 00..2277~~00..3344 00..9900~~11..2200 00..8800~~11..1100 00..8800~~11..1100
55
55 A24303 A24303 30CrMnSiA30CrMnSiA 00..2288~~00..3344 00..9900~~11..2200 00..8800~~11..1100 00..8800~~11..1100
CrMnSi
CrMnSi
56
56 A24353 A24353 35CrMnSiA35CrMnSiA 00..3322~~00..3399 11..1100~~11..4400 00..8800~~11..1100 11..1100~~11..4400
57
57 A34202 A34202 20CrMnMo20CrMnMo 00..1177~~00..2233 00..1177~~00..3377 00..9900~~11..2200 11..1100~~11..4400 00..2200~~00..3300
CrMnMo
CrMnMo
58
58 A34402 A34402 40CrMnMo40CrMnMo 00..3377~~00..4455 00..1177~~00..3377 00..9900~~11..2200 00..9900~~11..2200 00..2200~~00..3300
59
59 A26202 A26202 20CrMnTi20CrMnTi 0.0.1717~0~0.2.233 0.0.1717~0~0.3.377 0.80~1.100.80~1.10 1.1.0000~1~1.3.30 0 0.0.0404
CrMnTi
CrMnTi
60
60 A26302 A26302 30CrMnTi30CrMnTi 0.0.2424~0~0.3.322 0.0.1717~0~0.3.377 0.800.80~1~1.1.100 1.1.0000~1~1.3.300 0.04~0.100.04~0.10
61
Table 1(finished)
Table 1(finished)
Chemical Composition % Chemical Composition % Steel Group Steel Group I I t t e e m m Unified Unified digital digital code code Steel grade Steel grade C C Si Si Mn Mn Cr Cr Mo Mo Ni Ni W W B B Al Al Ti Ti VV CrMnNiMoCrMnNiMo 74 74 A50183 A50183 18CrNiMnMoA18CrNiMnMoA 0.15~0.21 0.15~0.21 0.17~0.37 0.17~0.37 1.10~1.40 1.10~1.40 1.00~1.30 1.00~1.30 0.20~0.30 0.20~0.30 1.00~1.301.00~1.30
CrNiMoV
CrNiMoV 75 75 A51453 A51453 45CrNiMoVA45CrNiMoVA 0.42~0.42~0.49 0.49 0.170.17~0.37 ~0.37 0.50~0.80 0.50~0.80 0.800.80~1.10 ~1.10 0.200.20~0.30 ~0.30 1.301.30~1.80 ~1.80 0.10~0.10~0.200.20
CrNiW
CrNiW 76 76 A52183 A52183 18Cr2Ni4WA18Cr2Ni4WA 0.13~0.13~0.19 0.19 0.170.17~0.37 ~0.37 0.30~0.30~0.60 0.60 1.351.35~1.65 ~1.65 4.00~4.00~4.504.50 0.80~0.80~1.201.20
77
77 A52253 A52253 25Cr2Ni4WA25Cr2Ni4WA 0.21~0.21~0.28 0.28 0.170.17~0.37 ~0.37 0.30~0.30~0.60 0.60 1.351.35~1.65 ~1.65 4.00~4.00~4.504.50 0.80~0.80~1.201.20
Notes: Notes: 1.
1. The steel grades with The steel grades with code “A” in the code “A” in the standard can only be ordered as standard can only be ordered as high-grade fine steel and other as fine high-grade fine steel and other as fine steel.steel. 2.
2. According to their requirement, the buyer can According to their requirement, the buyer can order, by order, by adding code “A” or adding code “A” or “E” following the steel “E” following the steel grades (remove code “A” first grades (remove code “A” first for the steel grades with for the steel grades with it), theit), the steel grades in Table 1 as high-grade fine steel (for the steel grades without code “A”) or extra fine steel (for all steel grades). The buyer can place a special order steel grades in Table 1 as high-grade fine steel (for the steel grades without code “A”) or extra fine steel (for all steel grades). The buyer can place a special order if they have more requirements against chemical compositions of steel grades in table.
if they have more requirements against chemical compositions of steel grades in table. 3.
3. The unified digital codes are added according to the regulation of GB/T 17616. The trailing number of fine steel is “2”, high-grade fine steel (with code “A”) is “3”,The unified digital codes are added according to the regulation of GB/T 17616. The trailing number of fine steel is “2”, high-grade fine steel (with code “A”) is “3”, and extra fine steel (with code “E”) is “6”.
and extra fine steel (with code “E”) is “6”. 4.
4. Rare earth element can be added as 0.05% calculated volume, and the analysis results of finished products for reference.Rare earth element can be added as 0.05% calculated volume, and the analysis results of finished products for reference.
Table 1(continued)
Table 1(continued)
Chemical Composition % Chemical Composition % Steel Steel GroupGroup I I t t e e m
m UnifiedUnifieddigitaldigital
code code Steel grade Steel grade C Si C Si Mn Mn Cr Cr Mo Mo Ni Ni W W B B Al Al Ti Ti 49 49 A22152 A22152 15CrMn15CrMn 00..1122~~00..1188 00..1177~~00..3377 11..1100~~11..4400 00..4400~~00..7700 50 50 A22202 A22202 20CrMn20CrMn 00..1177~~00..2233 00..1177~~00..3377 00..9900~~11..2200 00..9900~~11..2200 CrMn CrMn 51 51 A22402 A22402 40CrMn40CrMn 00..3377~~00..4455 00..1177~~00..3377 00..9900~~11..2200 00..9900~~11..2200 52
52 A24202 A24202 20CrMnSi20CrMnSi 00..1177~~00..2233 00..9900~~11..2200 00..8800~~11..1100 00..8800~~11..1100
53
53 A24252 A24252 25CrMnSi25CrMnSi 00..2222~~00..2288 00..9900~~11..2200 00..8800~~11..1100 00..8800~~11..1100
54
54 A24302 A24302 30CrMnSi30CrMnSi 00..2277~~00..3344 00..9900~~11..2200 00..8800~~11..1100 00..8800~~11..1100
55
55 A24303 A24303 30CrMnSiA30CrMnSiA 00..2288~~00..3344 00..9900~~11..2200 00..8800~~11..1100 00..8800~~11..1100
CrMnSi
CrMnSi
56
56 A24353 A24353 35CrMnSiA35CrMnSiA 00..3322~~00..3399 11..1100~~11..4400 00..8800~~11..1100 11..1100~~11..4400
57
57 A34202 A34202 20CrMnMo20CrMnMo 00..1177~~00..2233 00..1177~~00..3377 00..9900~~11..2200 11..1100~~11..4400 00..2200~~00..3300
CrMnMo
CrMnMo
58
58 A34402 A34402 40CrMnMo40CrMnMo 00..3377~~00..4455 00..1177~~00..3377 00..9900~~11..2200 00..9900~~11..2200 00..2200~~00..3300
59
59 A26202 A26202 20CrMnTi20CrMnTi 0.0.1717~0~0.2.233 0.0.1717~0~0.3.377 0.80~1.100.80~1.10 1.1.0000~1~1.3.30 0 0.0.0404
CrMnTi
CrMnTi
60
60 A26302 A26302 30CrMnTi30CrMnTi 0.0.2424~0~0.3.322 0.0.1717~0~0.3.377 0.800.80~1~1.1.100 1.1.0000~1~1.3.300 0.04~0.100.04~0.10
61
61 A40202 A40202 20CrNi20CrNi 0.0.1717~0~0.2.233 0.0.1717~0~0.3.377 0.400.40~0~0.7.700 0.0.4545~0~0.7.755 1.00~1.401.00~1.40
62
62 A40402 A40402 40CrNi40CrNi 0.0.3737~0~0.4.444 0.0.1717~0~0.3.377 0.500.50~0~0.8.800 0.0.4545~0~0.7.755 1.00~1.401.00~1.40
63
63 A40452 A40452 45CrNi45CrNi 0.0.4242~0~0.4.499 0.0.1717~0~0.3.377 0.500.50~0~0.8.800 0.0.4545~0~0.7.755 1.00~1.401.00~1.40
64
64 A40502 A40502 50CrNi50CrNi 00..4477~~00..5544 00..1177~~00..3377 00..5500~~00..8800 00..4455~~00..775 5 11..0000~~11..4400
65
65 A41122 A41122 12CrNi212CrNi2 00..1100~~00..1177 00..1177~~00..3377 00..3300~~00..6600 00..6600~~00..990 0 11..5500~~11..9900
66
66 A42122 A42122 12CrNi312CrNi3 00..1100~~00..1177 00..1177~~00..3377 00..3300~~00..6600 00..6600~~00..990 0 22..7755~~33..1155
67
67 A42202 A42202 20CrNi320CrNi3 00..1177~~00..2244 00..1177~~00..3377 00..3300~~00..6600 00..6600~~00..990 0 22..7755~~33..1155
68
68 A42302 A42302 30CrNi330CrNi3 00..2277~~00..3333 00..1177~~00..3377 00..3300~~00..6600 00..6600~~00..990 0 22..7755~~33..1155
69
69 A42372 A42372 37CrNi337CrNi3 00..3344~~00..4411 00..1177~~00..3377 00..3300~~00..6600 11..2200~~11..660 0 33..0000~~33..5500
70
70 A43122 A43122 12Cr2Ni412Cr2Ni4 00..1100~~00..1166 00..1177~~00..3377 00..3300~~00..6600 11..2255~~11..665 5 33..2255~~33..6655
CrNi
CrNi
71
71 A43202 A43202 20Cr2Ni420Cr2Ni4 00..1177~~00..2233 00..1177~~00..3377 00..3300~~00..6600 11..2255~~11..665 5 33..2255~~33..6655
72
72 A50202 A50202 20CrNiMo20CrNiMo 00..1177~~00..2233 00..1177~~00..3377 00..6600~~00..9955 00..4400~~00..7700 00..2200~~00..330 0 00..3355~~00..7755
CrNiMo
CrNiMo
73
Table 1(finished)
Table 1(finished)
Chemical Composition % Chemical Composition % Steel Group Steel Group I I t t e e m m Unified Unified digital digital code code Steel grade Steel grade C C Si Si Mn Mn Cr Cr Mo Mo Ni Ni W W B B Al Al Ti Ti VV CrMnNiMoCrMnNiMo 74 74 A50183 A50183 18CrNiMnMoA18CrNiMnMoA 0.15~0.21 0.15~0.21 0.17~0.37 0.17~0.37 1.10~1.40 1.10~1.40 1.00~1.30 1.00~1.30 0.20~0.30 0.20~0.30 1.00~1.301.00~1.30
CrNiMoV
CrNiMoV 75 75 A51453 A51453 45CrNiMoVA45CrNiMoVA 0.42~0.42~0.49 0.49 0.170.17~0.37 ~0.37 0.50~0.80 0.50~0.80 0.800.80~1.10 ~1.10 0.200.20~0.30 ~0.30 1.301.30~1.80 ~1.80 0.10~0.10~0.200.20
CrNiW
CrNiW 76 76 A52183 A52183 18Cr2Ni4WA18Cr2Ni4WA 0.13~0.13~0.19 0.19 0.170.17~0.37 ~0.37 0.30~0.30~0.60 0.60 1.351.35~1.65 ~1.65 4.00~4.00~4.504.50 0.80~0.80~1.201.20
77
77 A52253 A52253 25Cr2Ni4WA25Cr2Ni4WA 0.21~0.21~0.28 0.28 0.170.17~0.37 ~0.37 0.30~0.30~0.60 0.60 1.351.35~1.65 ~1.65 4.00~4.00~4.504.50 0.80~0.80~1.201.20
Notes: Notes: 1.
1. The steel grades with The steel grades with code “A” in the code “A” in the standard can only be ordered as standard can only be ordered as high-grade fine steel and other as fine high-grade fine steel and other as fine steel.steel. 2.
2. According to their requirement, the buyer can According to their requirement, the buyer can order, by order, by adding code “A” or adding code “A” or “E” following the steel “E” following the steel grades (remove code “A” first grades (remove code “A” first for the steel grades with for the steel grades with it), theit), the steel grades in Table 1 as high-grade fine steel (for the steel grades without code “A”) or extra fine steel (for all steel grades). The buyer can place a special order steel grades in Table 1 as high-grade fine steel (for the steel grades without code “A”) or extra fine steel (for all steel grades). The buyer can place a special order if they have more requirements against chemical compositions of steel grades in table.
if they have more requirements against chemical compositions of steel grades in table. 3.
3. The unified digital codes are added according to the regulation of GB/T 17616. The trailing number of fine steel is “2”, high-grade fine steel (with code “A”) is “3”,The unified digital codes are added according to the regulation of GB/T 17616. The trailing number of fine steel is “2”, high-grade fine steel (with code “A”) is “3”, and extra fine steel (with code “E”) is “6”.
and extra fine steel (with code “E”) is “6”. 4.
4. Rare earth element can be added as 0.05% calculated volume, and the analysis results of finished products for reference.Rare earth element can be added as 0.05% calculated volume, and the analysis results of finished products for reference.
Table 2
Table 2
P P S S Cu Cu Cr Cr Ni Ni MoMo Steel Categories Steel Categories Maximum % Maximum % FineFine Steel Steel 0.035 0.035 0.035 0.035 0.30 0.30 0.30 0.30 0.30 0.30 0.150.15
High-grade
High-grade Fine Fine Steel Steel 0.025 0.025 0.025 0.025 0.25 0.25 0.30 0.30 0.30 0.30 0.100.10 Extra
Extra Fine Fine Steel Steel 0.025 0.025 0.015 0.015 0.25 0.25 0.30 0.30 0.30 0.30 0.100.10
6.2 Smelting method
6.2 Smelting method
The smelting method is optional for metallurgical refinery unless it has been specified in the contract.
The smelting method is optional for metallurgical refinery unless it has been specified in the contract.
6.3 Delivery condition
6.3 Delivery condition
The delivery condition of steels is usually hot-rolled or hot heading. According to buyer’s requirements
The delivery condition of steels is usually hot-rolled or hot heading. According to buyer’s requirements
(written in the contract), steels can also be delivered as heat treatment condition (anneal, normalizing, or
(written in the contract), steels can also be delivered as heat treatment condition (anneal, normalizing, or
high tempering).
high tempering).
Pressure process used bar steel, according to the agreement reached between supplier and buyer, can
Pressure process used bar steel, according to the agreement reached between supplier and buyer, can
be delivered as turning, peeling or other finishing condition.
be delivered as turning, peeling or other finishing condition.
6.4 Mechanical properties
6.4 Mechanical properties
6.4.1 Determine the longitudinal mechanical properties and hardness of anneal or high tempering of
6.4.1 Determine the longitudinal mechanical properties and hardness of anneal or high tempering of
steel, by the test specimen with heat treatment, and the determination results should be accordance with
steel, by the test specimen with heat treatment, and the determination results should be accordance with
Table 3.
Table 3.
6.4.2 The mechanical properties specified in Table 3 apply to steels of 80mm maximum section size. For
6.4.2 The mechanical properties specified in Table 3 apply to steels of 80mm maximum section size. For
steels from 80 to 100mm in size, the elongation, reduction of area and impact absorbing energy are
steels from 80 to 100mm in size, the elongation, reduction of area and impact absorbing energy are
permissible to reduce 1% (absolute value), 5% (absolute value), and 5% (absolute value) respectively;
6.2 Smelting method
6.2 Smelting method
The smelting method is optional for metallurgical refinery unless it has been specified in the contract.
The smelting method is optional for metallurgical refinery unless it has been specified in the contract.
6.3 Delivery condition
6.3 Delivery condition
The delivery condition of steels is usually hot-rolled or hot heading. According to buyer’s requirements
The delivery condition of steels is usually hot-rolled or hot heading. According to buyer’s requirements
(written in the contract), steels can also be delivered as heat treatment condition (anneal, normalizing, or
(written in the contract), steels can also be delivered as heat treatment condition (anneal, normalizing, or
high tempering).
high tempering).
Pressure process used bar steel, according to the agreement reached between supplier and buyer, can
Pressure process used bar steel, according to the agreement reached between supplier and buyer, can
be delivered as turning, peeling or other finishing condition.
be delivered as turning, peeling or other finishing condition.
6.4 Mechanical properties
6.4 Mechanical properties
6.4.1 Determine the longitudinal mechanical properties and hardness of anneal or high tempering of
6.4.1 Determine the longitudinal mechanical properties and hardness of anneal or high tempering of
steel, by the test specimen with heat treatment, and the determination results should be accordance with
steel, by the test specimen with heat treatment, and the determination results should be accordance with
Table 3.
Table 3.
6.4.2 The mechanical properties specified in Table 3 apply to steels of 80mm maximum section size. For
6.4.2 The mechanical properties specified in Table 3 apply to steels of 80mm maximum section size. For
steels from 80 to 100mm in size, the elongation, reduction of area and impact absorbing energy are
steels from 80 to 100mm in size, the elongation, reduction of area and impact absorbing energy are
permissible to reduce 1% (absolute value), 5% (absolute value), and 5% (absolute value) respectively;
permissible to reduce 1% (absolute value), 5% (absolute value), and 5% (absolute value) respectively;
for size from 100 to 150mm, the elongation, reduction of area and impact absorbing energy are
for size from 100 to 150mm, the elongation, reduction of area and impact absorbing energy are
permissible to reduce 2% (absolute value), 10% (absolute value) and 10% (absolute value) respectively;
permissible to reduce 2% (absolute value), 10% (absolute value) and 10% (absolute value) respectively;
for size from 150 to 250mm, the elongation, reduction of area and impact absorbing energy are
for size from 150 to 250mm, the elongation, reduction of area and impact absorbing energy are
permissible to reduce 3% (absolute value), 15 (absolute value) and 15% (absolute value) respectively.
permissible to reduce 3% (absolute value), 15 (absolute value) and 15% (absolute value) respectively.
6.4.3 It is permissible to forge (or roll) the steels test specimen, of which the size more than 80mm, to
6.4.3 It is permissible to forge (or roll) the steels test specimen, of which the size more than 80mm, to
make its section size as 70~80mm. The determination result should comply with Table 3.
make its section size as 70~80mm. The determination result should comply with Table 3.
6.4.4 If the steels are deliver as quenching or tempering condition by the buyer request; the test
6.4.4 If the steels are deliver as quenching or tempering condition by the buyer request; the test
specimen for mechanical properties should be free of heat treatment. The mechanical properties should
specimen for mechanical properties should be free of heat treatment. The mechanical properties should
be specified on the agreement reached between supplier and buyer.
be specified on the agreement reached between supplier and buyer.
6.5 Macrostructure
6.5 Macrostructure
6.5.1 The acid etch macroscopic cross-section of steel specimens should be free of visible cavity, air
6.5.1 The acid etch macroscopic cross-section of steel specimens should be free of visible cavity, air
bubble, crackle, inclusion, skull patch, shatter crack, and intergranular crack.
bubble, crackle, inclusion, skull patch, shatter crack, and intergranular crack.
6.5.2 The acid etch macrostructure grade should be comply with the Table 4.
6.5.2 The acid etch macrostructure grade should be comply with the Table 4.
6.5.2.1 The surface spot segregation and edge spot segregation of 38CrMoAl or 38CrMoAlA should not
6.5.2.1 The surface spot segregation and edge spot segregation of 38CrMoAl or 38CrMoAlA should not
be more than grade 2.5 and 1.5 respectively.
be more than grade 2.5 and 1.5 respectively.
6.5.2.2 The cutting used steel is allowed to have subsurface inclusion, subsurface bubble etc. defects
6.5.2.2 The cutting used steel is allowed to have subsurface inclusion, subsurface bubble etc. defects
which not more than the depth of surface defects permissible.
which not more than the depth of surface defects permissible.
6.5.2.3 If the supplier can guarantee the macrostructure test of steels is qualified, ultrasonic or other
6.5.2.3 If the supplier can guarantee the macrostructure test of steels is qualified, ultrasonic or other
nondestructive inspection method can be used to replace acid etch.
Table 3
Table 3
Heat Treatment
Heat Treatment Mechanical PropertiesMechanical Properties Quenching
Quenching TemperTemper
Heating-up Temperature Heating-up Temperature ( (℃℃)) Tensile Tensile Strength Strength (MPa) (MPa) Yield Yield Strength Strength (MPa) (MPa) Elong. Elong. (%) (%) Red. of Red. of area area (%) (%) Impact Impact absorbing absorbing Energy Energy (J) (J) S S t t e e e e l l G G r r o o u u p p I I t t e e m m S S t t e e e e l l G G r r a a d d e e T T e e s s t t S S p p e e c c i i m m e e
n n
S S i i z z e e ( ( m m m m ) ) First First Quenching Quenching Second Second Quenching Quenching Quenching Quenching compound compound Heating-up Heating-up Temperature Temperature ( (℃℃)) Coolant Coolant Minimum Minimum Max. Max. Brinell Brinell Hardness Hardness on anneal on anneal or high or high tempering tempering condition condition 850
850 - - Water, Water, Oil Oil 200200 Water,Water, Air Air 1
1 20Mn2 20Mn2 1515
880
880 - - Water, Water, Oil Oil 440440 Water,Water, Air Air
785 59
785 590 0 10 10 40 40 47 47 187187
2 30Mn2
2 30Mn2 2525 840 840 - - Water Water 500 500 Water Water 785 785 635 635 12 12 45 45 63 63 207207
3 35Mn2
3 35Mn2 2525 840 840 - - Water Water 500 500 Water Water 835 835 685 685 12 12 45 45 55 55 207207
4 40Mn2
4 40Mn2 2525 840 840 - - Water, Water, Oil Oil 540 540 Water Water 885 885 735 735 12 12 45 45 55 55 217217
5 45Mn2
5 45Mn2 2525 840 840 - - Oil Oil 550550 Water,Water, Oil
Oil 885 885 73735 5 10 10 45 45 47 47 217217 Mn
Mn
6 50Mn2
6 50Mn2 2525 820 820 - - Oil Oil 550550 Water,Water, Oil
Oil 930 930 785 785 9 9 40 40 39 39 229229 MnV
MnV 7 7 20MnV20MnV 1515 880 880 - - Water, Water, Oil Oil 200200 Water,Water, Air
Air 785 785 59590 0 10 10 40 40 55 55 187187
8 27SiMn
8 27SiMn 2525 920 920 - - Water Water 450450 Water,Water, Oil
Oil 980 980 83835 5 12 12 40 40 39 39 217217
9 35SiMn
9 35SiMn 2525 900 900 - - Water Water 570570 Water,Water, Oil
Oil 885 885 73735 5 15 15 45 45 47 47 229229 SiMn
SiMn
10 42SiMn
10 42SiMn 2525 880 880 - - Water Water 590 590 Water Water 885 885 735 735 15 15 40 40 47 47 229229 11
11 20SiMn220SiMn2 MoV
MoV SampleSample 900 900 - - Oil Oil 200200
Water, Water, Air Air 1380 1380 - - 10 10 45 45 55 55 269269 12 12 25SiMn225SiMn2 MoV
MoV SampleSample 900 900 - - Oil Oil 200200
Water, Water, Air Air 1470 1470 - - 10 10 40 40 47 47 269269 S S i i M M n n M M o o V V 13 13 37SiMn237SiMn2 MoV
MoV 2525 870 870 - - Water, Water, Oil Oil 650650
Water, Water, Air
Air 980 980 83835 5 12 12 50 50 63 63 269269
14 40B
14 40B 2525 840 840 - - Water Water 550 550 Water Water 785 785 635 635 12 12 45 45 55 55 207207
15 45B
15 45B 2525 840 840 - - Water Water 550 550 Water Water 835 835 685 685 12 12 45 45 47 47 217217 B
B
16 50B
16 50B 2020 840 840 - - Oil Oil 600 600 Air Air 785 785 540 540 10 10 45 45 39 39 207207
Table 3 (Continued)
Table 3 (Continued)
Heat Treatment
Heat Treatment Mechanical PropertiesMechanical Properties Quenching
Quenching TemperTemper
Heating-up Temperature Heating-up Temperature ( (℃℃)) Tensile Tensile Strength Strength (MPa) (MPa) Yield Yield Strength Strength (MPa) (MPa) Elong. Elong. (%) (%) Red. of Red. of area area (%) (%) Impact Impact absorbing absorbing Energy Energy (J) (J) S S t t e e e e l l G G r r o o u u p p I I t t e e m m S S t t e e e e l l G G r r a a d d e e T T e e s s t t S S p p e e c c i i m m e e
n n
S S i i z z e e ( ( m m m m ) ) First First Quenching Quenching Second Second Quenching Quenching Quenching Quenching compound compound Heating-up Heating-up Temperature Temperature ( (℃℃)) Coolant Coolant Minimum Minimum Max. Max. Brinell Brinell Hardness Hardness on anneal on anneal or high or high tempering tempering condition condition 17
17 40MnB 40MnB 2525 850850 - - Oil Oil 500500 Water,Water,
Oil
Oil 980 980 785 785 10 10 45 45 47 47 207207 MnB
MnB 18
18 45MnB 45MnB 2525 840840 - - Oil Oil 500500 Water,Water,
Oil Oil 1030 1030 835 835 9 9 40 40 39 39 217217 M M n n M M o o B B 19
19 20MnMoB 20MnMoB 1515 880880 - - Oil Oil 200 200 Oil, Oil, Air Air 1080 1080 885 885 10 10 50 50 55 55 207207
20 15MnVB
20 15MnVB 1515 860 860 - - Oil Oil 200200 Water,Water, Air
Air 885 885 635 635 10 10 45 45 55 55 207207
21 20MnVB
21 20MnVB 1515 860 860 - - Oil Oil 200200 Water,Water, Air
Air 1080 1080 885 885 10 10 45 45 55 55 207207 MnVB
MnVB
22 40MnVB
22 40MnVB 2525 850 850 - - Oil Oil 520520 Water,Water, Oil
Oil 980 980 785 785 10 10 45 45 47 47 207207 23 20MnTiB
23 20MnTiB 1515 860 860 - - Oil Oil 200200 Water,Water, Air Air 1130 1130 930 930 10 10 45 45 55 55 187187 M M n n T T i i B B 24
24 25MnTiBRE25MnTiBRE SampleSample 860 860 - - Oil Oil 200200 Water,Water, Air
Table 3 (Continued)
Table 3 (Continued)
Heat Treatment
Heat Treatment Mechanical PropertiesMechanical Properties Quenching
Quenching TemperTemper
Heating-up Temperature Heating-up Temperature ( (℃℃)) Tensile Tensile Strength Strength (MPa) (MPa) Yield Yield Strength Strength (MPa) (MPa) Elong. Elong. (%) (%) Red. of Red. of area area (%) (%) Impact Impact absorbing absorbing Energy Energy (J) (J) S S t t e e e e l l G G r r o o u u p p I I t t e e m m S S t t e e e e l l G G r r a a d d e e T T e e s s t t S S p p e e c c i i m m e e
n n
S S i i z z e e ( ( m m m m ) ) First First Quenching Quenching Second Second Quenching Quenching Quenching Quenching compound compound Heating-up Heating-up Temperature Temperature ( (℃℃)) Coolant Coolant Minimum Minimum Max. Max. Brinell Brinell Hardness Hardness on anneal on anneal or high or high tempering tempering condition condition 17
17 40MnB 40MnB 2525 850850 - - Oil Oil 500500 Water,Water,
Oil
Oil 980 980 785 785 10 10 45 45 47 47 207207 MnB
MnB 18
18 45MnB 45MnB 2525 840840 - - Oil Oil 500500 Water,Water,
Oil Oil 1030 1030 835 835 9 9 40 40 39 39 217217 M M n n M M o o B B 19
19 20MnMoB 20MnMoB 1515 880880 - - Oil Oil 200 200 Oil, Oil, Air Air 1080 1080 885 885 10 10 50 50 55 55 207207
20 15MnVB
20 15MnVB 1515 860 860 - - Oil Oil 200200 Water,Water, Air
Air 885 885 635 635 10 10 45 45 55 55 207207
21 20MnVB
21 20MnVB 1515 860 860 - - Oil Oil 200200 Water,Water, Air
Air 1080 1080 885 885 10 10 45 45 55 55 207207 MnVB
MnVB
22 40MnVB
22 40MnVB 2525 850 850 - - Oil Oil 520520 Water,Water, Oil
Oil 980 980 785 785 10 10 45 45 47 47 207207 23 20MnTiB
23 20MnTiB 1515 860 860 - - Oil Oil 200200 Water,Water, Air Air 1130 1130 930 930 10 10 45 45 55 55 187187 M M n n T T i i B B 24
24 25MnTiBRE25MnTiBRE SampleSample 860 860 - - Oil Oil 200200 Water,Water, Air
Air 1380 1380 - - 10 10 40 40 47 47 229229
25 15Cr
25 15Cr 1515 880 880 780~820 780~820 Water, Water, Oil Oil 200200 Water,Water, Air
Air 735 735 490 490 11 11 45 45 55 55 179179 26 15CrA
26 15CrA 1515 880 880 770~820 770~820 Water, Water, Oil Oil 180 180 Oil, Oil, Air Air 685 685 490 490 12 12 45 45 55 55 179179 27 20Cr
27 20Cr 1515 880 880 780~820 780~820 Water, Water, Oil Oil 200200 Water,Water, Air
Air 835 835 540 540 10 10 40 40 47 47 179179 28 30Cr
28 30Cr 2525 860 860 - - Oil Oil 500500 Water,Water,
Oil
Oil 885 885 685 685 11 11 45 45 47 47 187187 29 35Cr
29 35Cr 2525 860 860 - - Oil Oil 500500 Water,Water,
Oil
Oil 930 930 735 735 11 11 45 45 47 47 207207 Cr
Cr
30 40Cr
30 40Cr 2525 850 850 - - Oil Oil 520520 Water,Water,
Oil
Oil 980 980 785 785 9 9 45 45 47 47 207207
Table 3 (Continued)
Table 3 (Continued)
Heat Treatment
Heat Treatment Mechanical PropertiesMechanical Properties Quenching
Quenching TemperTemper
Heating-up Temperature Heating-up Temperature ( (℃℃)) Tensile Tensile Strength Strength (MPa) (MPa) Yield Yield Strength Strength (MPa) (MPa) Elong. Elong. (%) (%) Red. of Red. of area area (%) (%) Impact Impact absorbing absorbing Energy Energy (J) (J) S S t t e e e e l l G G r r o o u u p p I I t t e e m m S S t t e e e e l l G G r r a a d d e e T T e e s s t t S S p p e e c c i i m m e e
n n
S S i i z z e e ( ( m m m m ) ) First First Quenching Quenching Second Second Quenching Quenching Quenching Quenching compound compound Heating-up Heating-up Temperature Temperature ( (℃℃)) Coolant Coolant Minimum Minimum Max. Max. Brinell Brinell Hardness Hardness on anneal on anneal or high or high tempering tempering condition condition 31
31 45Cr 45Cr 2525 840840 - - Oil Oil 520520 Water,Water,
Oil
Oil 1030 1030 835 835 9 9 40 40 39 39 217217 Cr
Cr
32
32 50Cr 50Cr 2525 830830 - - Oil Oil 520520 Water,Water,
Oil
Oil 1080 1080 930 930 9 9 40 40 39 39 229229 CrSi
CrSi 33 33 38CrSi 38CrSi 2525 900900 - - Oil Oil 600600 Water,Water, Oil
Oil 980 980 835 835 12 12 50 50 55 55 255255 34 12CrMo
34 12CrMo 3030 900 900 - - Air Air 650 650 Air Air 410 410 265 265 24 24 60 60 110 110 179179 35 15CrMo
35 15CrMo 3030 900 900 - - Air Air 650 650 Air Air 440 440 295 295 22 22 60 60 94 94 179179 36 20CrMo
36 20CrMo 1515 880 880 - - Water, Water, Oil Oil 500500 Water,Water, Oil
Oil 885 885 685 685 12 12 50 50 78 78 197197 37 30CrMo
37 30CrMo 2525 880 880 - - Water, Water, Oil Oil 540540 Water,Water, Oil
Oil 930 930 785 785 12 12 50 50 63 63 229229
38 30CrMoA
38 30CrMoA 1515 880 880 - - Oil Oil 540540 Water,Water, Oil
Oil 930 930 735 735 12 12 50 50 71 71 229229 39 35CrMo
39 35CrMo 2525 850 850 - - Oil Oil 550550 Water,Water, Oil
Oil 980 980 835 835 12 12 45 45 63 63 229229 CrMo
CrMo
40 42CrMo
40 42CrMo 2525 850 850 - - Oil Oil 560560 Water,Water, Oil
Table 3 (Continued)
Table 3 (Continued)
Heat Treatment
Heat Treatment Mechanical PropertiesMechanical Properties Quenching
Quenching TemperTemper
Heating-up Temperature Heating-up Temperature ( (℃℃)) Tensile Tensile Strength Strength (MPa) (MPa) Yield Yield Strength Strength (MPa) (MPa) Elong. Elong. (%) (%) Red. of Red. of area area (%) (%) Impact Impact absorbing absorbing Energy Energy (J) (J) S S t t e e e e l l G G r r o o u u p p I I t t e e m m S S t t e e e e l l G G r r a a d d e e T T e e s s t t S S p p e e c c i i m m e e
n n
S S i i z z e e ( ( m m m m ) ) First First Quenching Quenching Second Second Quenching Quenching Quenching Quenching compound compound Heating-up Heating-up Temperature Temperature ( (℃℃)) Coolant Coolant Minimum Minimum Max. Max. Brinell Brinell Hardness Hardness on anneal on anneal or high or high tempering tempering condition condition 31
31 45Cr 45Cr 2525 840840 - - Oil Oil 520520 Water,Water,
Oil
Oil 1030 1030 835 835 9 9 40 40 39 39 217217 Cr
Cr
32
32 50Cr 50Cr 2525 830830 - - Oil Oil 520520 Water,Water,
Oil
Oil 1080 1080 930 930 9 9 40 40 39 39 229229 CrSi
CrSi 33 33 38CrSi 38CrSi 2525 900900 - - Oil Oil 600600 Water,Water, Oil
Oil 980 980 835 835 12 12 50 50 55 55 255255 34 12CrMo
34 12CrMo 3030 900 900 - - Air Air 650 650 Air Air 410 410 265 265 24 24 60 60 110 110 179179 35 15CrMo
35 15CrMo 3030 900 900 - - Air Air 650 650 Air Air 440 440 295 295 22 22 60 60 94 94 179179 36 20CrMo
36 20CrMo 1515 880 880 - - Water, Water, Oil Oil 500500 Water,Water, Oil
Oil 885 885 685 685 12 12 50 50 78 78 197197 37 30CrMo
37 30CrMo 2525 880 880 - - Water, Water, Oil Oil 540540 Water,Water, Oil
Oil 930 930 785 785 12 12 50 50 63 63 229229
38 30CrMoA
38 30CrMoA 1515 880 880 - - Oil Oil 540540 Water,Water, Oil
Oil 930 930 735 735 12 12 50 50 71 71 229229 39 35CrMo
39 35CrMo 2525 850 850 - - Oil Oil 550550 Water,Water, Oil
Oil 980 980 835 835 12 12 45 45 63 63 229229 CrMo
CrMo
40 42CrMo
40 42CrMo 2525 850 850 - - Oil Oil 560560 Water,Water, Oil
Oil 1080 1080 930 930 12 12 45 45 63 63 217217
41 12CrMoV
41 12CrMoV 3030 970 970 - - Air Air 750 750 Air Air 440 440 225 225 22 22 50 50 78 78 241241
42 35CrMoV
42 35CrMoV 2525 900 900 - - Oil Oil 630630 Water,Water, Oil
Oil 1080 1080 930 930 10 10 50 50 71 71 241241
43 12Cr1MoV
43 12Cr1MoV 3030 970 970 - - Air Air 750 750 Air Air 490 490 245 245 22 22 50 50 71 71 179179 44
44 25Cr2MoVA25Cr2MoVA 2525 900 900 - - Oil Oil 640 640 Air Air 930 930 785 785 14 14 55 55 63 63 241241
C C r r M M o o V V 45
45 25Cr2Mo1VA25Cr2Mo1VA 2525 1040 1040 - - Air Air 700 700 Air Air 735 735 590 590 16 16 50 50 47 47 241241 CrMo
CrMo Al
Al 4646 38CrMoAl38CrMoAl 3030 940 940 - - Water, Water, Oil Oil 640640
Water, Water, Oil
Oil 980 980 835 835 14 14 50 50 71 71 229229
CrV 47
CrV 47 40CrV40CrV 2525 880 880 - - Oil Oil 650650 Water,Water, Oil
Oil 885 885 735 735 10 10 50 50 71 71 241241
Table 3 (Continued)
Table 3 (Continued)
Heat Treatment
Heat Treatment Mechanical PropertiesMechanical Properties Quenching
Quenching TemperTemper
Heating-up Temperature Heating-up Temperature ( (℃℃)) Tensile Tensile Strength Strength (MPa) (MPa) Yield Yield Strength Strength (MPa) (MPa) Elong. Elong. (%) (%) Red. of Red. of area area (%) (%) Impact Impact absorbing absorbing Energy Energy (J) (J) S S t t e e e e l l G G r r o o u u p p I I t t e e m m S S t t e e e e l l G G r r a a d d e e T T e e s s t t S S p p e e c c i i m m e e
n n
S S i i z z e e ( ( m m m m ) ) First First Quenching Quenching Second Second Quenching Quenching Quenching Quenching compound compound Heating-up Heating-up Temperature Temperature ( (℃℃)) Coolant Coolant Minimum Minimum Max. Max. Brinell Brinell Hardness Hardness on anneal on anneal or high or high tempering tempering condition condition CrV
CrV 48 48 50CrVA 50CrVA 2525 860860 - - Oil Oil 500500 Water,Water, Oil
Oil 1280 1280 1130 1130 10 10 40 40 - - 255255 49
49 15CrMn 15CrMn 1515 880880 - - Oil Oil 200200 Water,Water,
Air
Air 785 785 590 590 12 12 50 50 47 47 179179 50
50 20CrMn 20CrMn 1515 850850 - - Oil Oil 200200 Water,Water,
Air
Air 930 930 735 735 10 10 45 45 47 47 187187 CrMn
CrMn
51 40CrMn
51 40CrMn 2525 840 840 - - Oil Oil 550550 Water,Water, Oil
Oil 980 980 835 835 9 9 45 45 47 47 229229 CrMn
CrMn Si
Si 52 52 20CrMnSi20CrMnSi 2525 880 880 - - Oil Oil 480480
Water, Water, Oil
Oil 785 785 635 635 12 12 45 45 55 55 207207 53 25CrMnSi
53 25CrMnSi 2525 880 880 - - Oil Oil 480480 Water,Water, Oil
Oil 1080 1080 885 885 10 10 40 40 39 39 217217 54 30CrMnSi
54 30CrMnSi 2525 880 880 - - Oil Oil 520520 Water,Water, Oil
Oil 1080 1080 885 885 10 10 45 45 39 39 229229 55 30CrMnSiA
55 30CrMnSiA 2525 880 880 - - Oil Oil 540540 Water,Water, Oil
Oil 1080 1080 835 835 10 10 45 45 39 39 229229
Sample
Sample Heating up to 880Heating up to 880℃℃, isothermal quench at 280~310, isothermal quench at 280~310℃℃ C C r r M M n n S S i i 56 35CrMnSiA 56 35CrMnSiA Sample
Table 3 (Continued)
Table 3 (Continued)
Heat Treatment
Heat Treatment Mechanical PropertiesMechanical Properties Quenching
Quenching TemperTemper
Heating-up Temperature Heating-up Temperature ( (℃℃)) Tensile Tensile Strength Strength (MPa) (MPa) Yield Yield Strength Strength (MPa) (MPa) Elong. Elong. (%) (%) Red. of Red. of area area (%) (%) Impact Impact absorbing absorbing Energy Energy (J) (J) S S t t e e e e l l G G r r o o u u p p I I t t e e m m S S t t e e e e l l G G r r a a d d e e T T e e s s t t S S p p e e c c i i m m e e
n n
S S i i z z e e ( ( m m m m ) ) First First Quenching Quenching Second Second Quenching Quenching Quenching Quenching compound compound Heating-up Heating-up Temperature Temperature ( (℃℃)) Coolant Coolant Minimum Minimum Max. Max. Brinell Brinell Hardness Hardness on anneal on anneal or high or high tempering tempering condition condition CrV
CrV 48 48 50CrVA 50CrVA 2525 860860 - - Oil Oil 500500 Water,Water, Oil
Oil 1280 1280 1130 1130 10 10 40 40 - - 255255 49
49 15CrMn 15CrMn 1515 880880 - - Oil Oil 200200 Water,Water,
Air
Air 785 785 590 590 12 12 50 50 47 47 179179 50
50 20CrMn 20CrMn 1515 850850 - - Oil Oil 200200 Water,Water,
Air
Air 930 930 735 735 10 10 45 45 47 47 187187 CrMn
CrMn
51 40CrMn
51 40CrMn 2525 840 840 - - Oil Oil 550550 Water,Water, Oil
Oil 980 980 835 835 9 9 45 45 47 47 229229 CrMn
CrMn Si
Si 52 52 20CrMnSi20CrMnSi 2525 880 880 - - Oil Oil 480480
Water, Water, Oil
Oil 785 785 635 635 12 12 45 45 55 55 207207 53 25CrMnSi
53 25CrMnSi 2525 880 880 - - Oil Oil 480480 Water,Water, Oil
Oil 1080 1080 885 885 10 10 40 40 39 39 217217 54 30CrMnSi
54 30CrMnSi 2525 880 880 - - Oil Oil 520520 Water,Water, Oil
Oil 1080 1080 885 885 10 10 45 45 39 39 229229 55 30CrMnSiA
55 30CrMnSiA 2525 880 880 - - Oil Oil 540540 Water,Water, Oil
Oil 1080 1080 835 835 10 10 45 45 39 39 229229
Sample
Sample Heating up to 880Heating up to 880℃℃, isothermal quench at 280~310, isothermal quench at 280~310℃℃ C C r r M M n n S S i i 56 35CrMnSiA 56 35CrMnSiA Sample
Sample 950 950 890 890 Oil Oil 230 230 Air, Air, OilOil
57 20CrMnMo
57 20CrMnMo 1515 850 850 - - Oil Oil 200200 Water,Water, Air Air 1180 1180 885 885 10 10 45 45 55 55 217217 CrMn CrMn Mo Mo 58 40CrMnMo
58 40CrMnMo 2525 850 850 - - Oil Oil 600600 Water,Water, Oil
Oil 980 980 785 785 10 10 45 45 63 63 217217 59 20CrMnTi
59 20CrMnTi 1515 880 880 870 870 Oil Oil 200200 Water,Water, Air Air 1080 1080 850 850 10 10 45 45 55 55 217217 CrMn CrMn Ti Ti 60 30CrMnTi
60 30CrMnTi SampleSample 880 880 850 850 Oil Oil 200200 Water,Water, Air
Air 1470 1470 - - 9 9 40 40 47 47 229229
61 20CrNi
61 20CrNi 2525 850 850 - - Water, Water, Oil Oil 460460 Water,Water, Oil
Oil 785 785 590 590 10 10 50 50 63 63 197197 CrNi
CrNi
62 40CrNi
62 40CrNi 2525 820 820 - - Oil Oil 500500 Water,Water, Oil
Oil 980 980 785 785 10 10 45 45 55 55 241241
Table 3 (Continued)
Table 3 (Continued)
Heat Treatment
Heat Treatment Mechanical PropertiesMechanical Properties Quenching
Quenching TemperTemper
Heating-up Temperature Heating-up Temperature ( (℃℃)) Tensile Tensile Strength Strength (MPa) (MPa) Yield Yield Strength Strength (MPa) (MPa) Elong. Elong. (%) (%) Red. of Red. of area area (%) (%) Impact Impact absorbing absorbing Energy Energy (J) (J) S S t t e e e e l l G G r r o o u u p p I I t t e e m m S S t t e e e e l l G G r r a a d d e e T T e e s s t t S S p p e e c c i i m m e e
n n
S S i i z z e e ( ( m m m m ) ) First First Quenching Quenching Second Second Quenching Quenching Quenching Quenching compound compound Heating-up Heating-up Temperature Temperature ( (℃℃)) Coolant Coolant Minimum Minimum Max. Max. Brinell Brinell Hardness Hardness on anneal on anneal or high or high tempering tempering condition condition 63
63 45CrNi 45CrNi 2525 820820 - - Oil Oil 530530 Water,Water,
Oil
Oil 980 980 785 785 10 10 45 45 55 55 255255 64
64 50CrNi 50CrNi 2525 820820 - - Oil Oil 500500 Water,Water,
Oil
Oil 1080 1080 835 835 8 8 40 40 39 39 255255 65
65 12CrNi2 12CrNi2 1515 860860 780 780 Water, Water, Oil Oil 200200 Water,Water, Air
Air 785 785 590 590 12 12 50 50 63 63 207207 66 12CrNi3
66 12CrNi3 1515 860 860 780 780 Oil Oil 200200 Water,Water, Air
Air 930 930 685 685 11 11 50 50 71 71 217217 67 20CrNi3
67 20CrNi3 2525 830 830 - - Water, Water, Oil Oil 480480 Water,Water, Oil
Oil 930 930 735 735 11 11 55 55 78 78 241241 68 30CrNi3
68 30CrNi3 2525 820 820 - - Oil Oil 500500 Water,Water, Oil
Oil 980 980 785 785 9 9 45 45 63 63 241241 69 37CrNi3
69 37CrNi3 2525 820 820 - - Oil Oil 500500 Water,Water, Oil
Oil 1130 1130 980 980 10 10 50 50 47 47 269269 70 12Cr2Ni4
70 12Cr2Ni4 1515 860 860 780 780 Oil Oil 200200 Water,Water, Air
Air 1080 1080 835 835 10 10 50 50 71 71 269269 CrNi
CrNi
71 20Cr2Ni4
71 20Cr2Ni4 1515 880 880 780 780 Oil Oil 200200 Water,Water, Air
Air 1180 1180 1080 1080 10 10 45 45 63 63 269269 72 20CrNiMo