1.5 Specifications for Steels
1.5.4 API Specifications
The API fost ers the developm ent standar ds, cod es, and safe practi ces within the petrol eum indust ry. The API standar d appears wi th the prefix API before the specif ication. For example, API Spec 5D covers all grades of seaml ess drill pip e (for use in dril ling and pro ducing ope rations), process of manufa cture, ch emical composi tion and mech anical pro perty req uire-ments , testing and inspect ion methods , and requiremen ts for dimens ions, weigh ts, an d lengt hs [59] . API Spe c 5L covers a ll grade s of seaml ess and welded steel line pipe an d requ irements for dimens ions, weight, lengt hs, strengths, threade d en ds, plain ends, belle d ends, and thread protect ors, and test ing and inspect ion method s. Thi s specificat ion includes A25, A, B, X42, X46, X52, X56, X60, X65, X70, an d X80 grades, and grades intermedi ate to grade X42 and higher. It provides the standards for pipe suitable for use in conveying gas, water, and oil on both the oil and natural gas industries [60]. API Spec 5LC covers seamless, centrifugal cast, and welded corrosion-resistant alloy line pipe (austenitic stainless steels, martensitic stainless steels, TABLE 1.15 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Proprietary/AISI-SAE Alloy, and Similar Specification for Wrought Carbon Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 5082E Tubing, seamless, 0.31–0.38C, stress relieved G10350 1035
5085D Sheet, strip, and plate, 0.47–0.55C, annealed G10500 1050 5110F Wire, carbon, spring temper, cold drawn, 0.75–0.88C G10800 1080 5112J Wire, spring quality music wire, 0.70–1.00C, cold
drawn
G10900 1090
5115G Wire, valve spring quality, 0.60–0.75C, hardened and tempered
G10700 1070
5120J Strip, 0.68–0.80C G10740 1074
5121G Sheet and strip, 0.90–1.40C G10950 1095 MIL-S-7947
5122G Strip, 0.90–l.04C, hard temper G10950 1095 MIL-S-7947,
hard temper
5132G Bars, 0.90–1.30C G10950 1095
Source: From Specification for Drill Pipe, API Specification 5D, 3rd ed., August 1, 1992, American Petroleum Institute, Washington, D.C.
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6250H Bars, forgings, and tubing, 1.5Cr
3.5Ni (0.07–0.13C)
K44910 3310 MIL-S-7393,
Composition I 6255A Bars, forgings, and tubing, 1.1Si
1.45Cr 1.0Mo 0.08A1 (0.16–
0.22C), premium air quality, double vacuum melted
K21940 CBS 600
6256A Bars, forgings, and tubing, 1.0Cr 3.0Ni 4.5Mo 0.08A1 0.38V (0.10–0.16C), premium air quality, double vacuum melted
K71350 CBS 1000M
6257 Bars, forgings, and tubing, 1.6Si 0.82Cr 1.8Ni 0.40Mo 0.08V (0.40–0.44C), consumable Electrode vacuum remelted, normalized and tempered 6260L Bars, forgings, and tubing,
carburizing grade, 1.2Cr 3.2Ni 0.12Mo (0.07–0.13C)
G93106 9310
6263H Bars, forgings, and tubing, carburizing grade, 1.2Cr 3.2Ni 0.12Mo (0.11–0.17C)
G93150 9315
6264G Bars, forgings, and tubing, carburizing grade, 3.2Ni 1.2Cr 0.12Mo (0.14–0.20C)
K44414 9317
6265H Bars, forgings, and tubing, 1.2Cr 3.25Ni (0.07–0.13C), vacuum consumable electrode remelted
G93106 9310
6266G Bars, forgings, and tubing, 0.50Cr 1.82Ni 0.25Mo 0.003B 0.06V (0.08–0.13C)
K21028 43BV12
6267D Bars, forgings, and tubing, 1.2Cr 3.25Ni 0.12Mo (0.07–0.13C), electroslag remelted or vacuum remelted, consumable electrode
G93106 9310
6270L Bars, forgings, and tubing, 0.5Cr 0.55Ni 0.20Mo (0.11–0.17C)
G86150 8615
6272H Bars, forgings, and tubing, 0.50Cr 0.55Ni 0.20Mo (0.15–0.20C)
G86170 8617
6274L Bars, forgings, and tubing, 0.50Cr 0.55Ni 0.20Mo (0.18–0.23C)
G86200 8620
6275F Bars, forgings, and tubing, 0.40Cr 0.45Ni 0.12Mo 0.002B (0.15–
0.20C)
G94171 94B17
6276F Bars, forgings, and tubing, 0.50Cr 0.55Ni 0.20Mo (0.18–0.23C), consumable electrode vacuum melted
G86200 8620
Continued
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6277D Bars, forgings, and tubing, 0.50Cr
0.55Ni 0.20Mo (0.18–0.23C), vacuum arc or electroslag remelted
G86200 8620
6278A Bars, forgings, and tubing, 4.1Cr 3.4Ni 4.2Mo 1.2V (0.11–0.15C), premium aircraft quality for bearing applications, double vacuum melted
6280H Bars, forgings, and rings, 0.50Cr 0.55Ni 0.20Mo (0.28–0.33C)
G86300 8630 MIL-S-6050
6281G Tubing, mechanical, 0.50Cr 0.55Ni 0.20Mo (0.28–0.33C)
G86300 8630
6282G Tubing, mechanical, 0.50Cr 0.55Ni 0.25Mo (0.33–0.38C)
G87350 8735
6290F Bars and forgings, carburizing grade, 1.8Ni 0.25Mo (0.11–0.17C)
G46150 4615 MIL-S-7493,
Composition 4615 6292F Bars and forgings, carburizing
grade, 1.8Ni 0.25Mo (0.14–0.20C)
G46170 4617 MIL-S-7493
Composition 4617 6294F Bars and forgings, carburizing
grade, 1.8Ni 0.25Mo (0.17–0.22C)
G46200 4620
6299C Bars, forgings, and tubing, 0.50Cr 1.8Ni 0.25Mo (0.17–0.23C)
H43200 4320H
6300C Bars and forgings, 0.25Mo (0.35–0.40C)
G40370 4037
6302E Bars, forgings, and tubing, low alloy, heat resistant, 0.65Si 1.25Cr 0.50Mo 0.25V (0.28–0.33C)
K23015 17-22A(S)
6303E Bars and forgings, low alloy, heat resistant, 0.65Si 1.25Cr 0.50Mo 0.85V (0.25–0.30C)
K22770 17-22A(V)
6304G Bars, forgings, and tubing, low alloy, heat resistant, 0.95Cr 0.55Mo 0.30V (0.40–0.50C)
K14675 17-22A MIL-S-24502
MAM
6304 Bars, forgings, and tubing, low alloy, heat resistant, 0.95Cr 0.55Mo 0.30V (0.40–0.50C)
K14675 17-22A MIL-S-24502
6305B Bars, forgings, and tubing, low alloy, heat resistant, 0.95Cr 0.55Mo 0.30V (0.40–0.50C), vacuum arc remelted
K14675 17–22A
Continued
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6308A Bars and forgings, 0.90Si 1.0Cr
2.0Ni 3.2Mo 2.0Cu 0.10V (0.07–0.13C), vacuum arc or electroslag remelted
K71040 Pyrowear, alloy 53
6312E Bars, forgings, and tubing, 1.8Ni 0.25Mo (0.38–0.43C)
K22440 4640
6317F Bars and forgings, 1.8Ni 0.25Mo (0.38–0.43C), heat treated, 125 ksi (862 MPa) tensile strength
K22400 4640
6320J Bars, forgings, and rings, 0.50Cr 0.55Ni 0.25Mo (0.33–0.38C)
G87350 8735
6321D Bars, forgings, and tubing, 0.42Cr 0.30Ni 0.12Mo 0.003B (0.38–0.43C)
K03810 81B40
6322K Bars, forgings, and rings, 0.50Cr 0.55Ni 0.25Mo (0.38–0.43C)
G87400 8740 MIL-S-6049
6323H Tubing, mechanical, 0.50Cr 0.55Ni 0.25Mo (0.38–0.43C)
G87400 8740
6324E Bars, forgings, and tubing, 0.65Cr 0.70Ni 0.25Mo (0.38–0.43C)
K11640 8740 Mod
6325F Bars and forgings, 0.50Cr 0.55Ni 0.25Mo (0.38–0.43C), heat treated, 105 ksi (724 MPa) tensile strength
G8740 8740 MIL-S-6049
6327G Bars and forgings, 0.50Cr 0.55Ni 0.25Mo (0.38–0.43C), heat treated, 125 ksi (862 MPa) tensile strength
G8740 8740 MIL-S-6049
6328H Bars, forgings, and tubing, 0.50Cr 0.55Ni 0.25Mo (0.48–0.53C)
K13550 8750
6330E Bars, forgings, and tubing, 0.65Cr 1.25Ni (0.33–0.38C)
K22033
6331 Wire, welding, 0.50Cr 0.55Ni 0.20Mo (0.33–0.38C), vacuum melted, environment controlled packaging
G87350 8735
6342H Bars, forgings, and tubing, 0.80Cr 1.0Ni 0.25Mo (0.38–0.43C)
G98400 9840
6348A Bars, 0.95Cr 0.20Mo (0.28–0.33C), normalized
G41300 4130 MIL-S-6758
6349B Bars, 0.95Cr 0.20Mo (0.38–0.43C), normalized
G41400 4140 MIL-S-5626
6350H Sheet, strip, and plate, 0.95Cr 0.20Mo (0.28–0.33C)
G41300 4130 MIL-S-18729
6351E Sheet, strip, and plate, 0.95Cr 0.20Mo (0.28–0.33C), spheroidized
G41300 4130
6352F Sheet, strip, and plate, 0.95Cr 0.20Mo (0.33–0.38C)
G41350 4135
Continued
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6354D Sheet, strip, and plate, 0.75Si
0.62Cr 0.20Mo 0.10Zr (0.10–0.17C)
K11914 NAX 9115-AC
6356D Sheet, strip, and plate, 0.95Cr 0.20Mo (0.30–0.35C)
G41320 4132
6357G Sheet, strip, and plate, 0.50Cr 0.55Ni 0.25Mo (0.33–0.38C)
G87350 8735
6358F Sheet, strip, and plate, 0.50Cr 0.55Ni 0.25Mo (0.38–0.43C)
G87400 8740
6359F Sheet, strip, and plate, 0.80Cr 1.8Ni 0.25Mo (0.38–0.43C)
G43400 4340
6360J Tubing, seamless, 0.95Cr 0.20Mo (0.28–0.33C), normalized or stress relieved
G41300 4130 MIL-T-6736
Condition N
6361C Tubing, seamless round, 0.95Cr 0.20Mo (0.28–0.33C), 125 ksi (860 MPa) tensile strength
G41300 4130 MIL-T-6736
6362D Tubing, seamless, 0.95Cr 0.20Mo (0.28–0.33C), 150 ksi (1034 MPa) tensile strength
G41300 4130 MIL-T-6736
Condition HT 6365H Tubing, seamless, 0.95Cr 0.20Mo
(0.33–0.38C), normalized or stress relieved
G41350 4135 MIL-T-6735
6370K Bars, forgings, and rings, 0.95Cr 0.20Mo (0.28–0.33C)
6373C Tubing, welded, 0.95Cr 0.20Mo (0.28–0.33C)
G41300 4130 MIL-T-6736
6374A Tubing, seam-free, round, 0.95Cr 0.20Mo (0.28–0.33C), 95 ksi (655 MPa) tensile strength
G41300 4130
6375 Wire, welding, 0.50Cr 0.55Ni 0.20Mo (0.18–0.23C), vacuum melted, environment controlled packaging
G86200 8620
6378E Bars, 1.0Cr 0.20Mo 0.045Se (0.39–0.48C), die drawn, 130 ksi (896 MPa) yield strength, free machining
K11542 4142H Mod
6379A Bars, die drawn, 0.95Cr 0.20Mo 0.05Te (0.40–0.53C), tempered, 165 ksi (1140 MPa) yield strength
K11546 4140 Mod
6381E Tubing, mechanical, 0.95Cr 0.20Mo (0.38–0.43C)
G41400 4140
Continued
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6382K Bars, forgings, and rings, 0.95Cr
0.20Mo (0.38–0.43C)
G41400 4140 MIL-S-5626
6385E Sheet, strip, and plate, low alloy, heat resistant, 1.25Cr 0.50Mo 0.65Si 0.25V (0.27–0.33C)
K23015 17–22A/S
6386B Sheet and plate, heat treated, 90 ksi and 100 ksi yield strength
K11856 —
6390C Tubing, mechanical, 0.95Cr 0.20Mo (0.38–0.43C)
G41400 4140
6395D Sheet, strip, and plate, 0.95Cr 0.20Mo (0.38–0.43C)
G41400 4140
6396B Sheet, strip, and plate, 0.80Cr 1.8Ni 0.25Mo (0.49–0.55C), annealed
K22950
6406C Sheet, strip, and plate, 2.1Cr 0.58Mo 1.6Si 0.05V (0.41–
0.46C), annealed
K34378 X200
6407E Bars, forgings, and tubing, 1.2Cr 2.0Ni 0.45Mo (0.27–0.33C)
K33020 IIS-220
6408 Bars and forgings, tool, hotwork, 5.2Cr 1.5Mo 1.0V (0.35–0.45C), electroslag remelted (ESR) or consumable electrode vacuum arc remelted (VAR), annealed
T20813 H-13
6409 Bars, forgings, and tubing, 0.80Cr 1.8Ni 0.25Mo (0.38–0.43C), special aircraft quality cleanliness, normalized and tempered
G43400 4340 MIL-S-5000
6411D Bars, forgings, and tubing, 0.88Cr 1.8Ni 0.42Mo 0.08V (0.28–
0.33C), consumable electrode remelted
K23080 4340 Mod
6412J Bars and forgings, 0.80Cr 1.8Ni 0.25Mo (0.35–0.40C)
G43370 4337
6413H Tubing, mechanical, 0.80Cr 1.8Ni 0.25Mo (0.35–0.40C)
G43370 4337
6414F Bars, forgings, and tubing, 0.80Cr 1.8Ni 0.25Mo (0.38–0.43C), vacuum consumable electrode remelted
G43400 4340
6415M MAM Bars, forgings, and tubing, 0.80Cr 1.8Ni 0.25Mo (0.38–0.43C)
G43400 4340 MIL-S-5000
6415 Bars, forgings, and tubing, 0.80Cr 1.8Ni 0.25Mo (0.38–0.43C)
G43400 4340 MIL-S-5000
6417D Bars, forgings, and tubing, 0.82Cr 1.8Ni 0.40Mo 1.6Si 0.08V (0.38–0.43C), consumable electrode remelted
K44220 300M
Continued
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6418G Bars, forgings, tubing, and rings,
0.30Cr 1.8Ni 0.40Mo 1.3Mn 1.5Si (0.23–0.28C)
K32550 Hy-Tuf MIL-S-7108
6419C Bars, forgings, and tubing, 0.82Cr 1.8Ni 0.40Mo 0.08V 1.6Si (0.40–
0.45C), consumable electrode vacuum remelted
K44220 300M MIL-S-8844
6421C Bars, forgings, and tubing, 0.80Cr 0.85Ni 0.20Mo 0.003B (0.35–0.40C)
— 98B37 Mod
6422F Bars, forgings, and tubing, 0.80Cr 0.85Ni 0.20Mo 0.003B 0.04V (0.38–0.43C)
K11940 98BV40 Mod
6423D Bars, forgings, and tubing, 0.92Cr 0.75Ni 0.52Mo 0.003B 0.04V (0.40–0.46C)
K24336 98BV40 Mod
6424B Bars, forgings, and tubing, 0.80Cr 1.8Ni 0.25Mo (0.49–0.55C)
K22950 —
6425 Bars, forgings, and tubing, 0.30Cr 1.8Ni 0.40Mo 1.4Mn 1.5Si (0.23–0.28C), consumable vacuum electrode remelted
K32550 Hy-Tuf
6426D Bars, forging, and tubing, 1.0Cr 0.58Mo 0.75Si (0.80–0.90C), consumable electrode melted
K18597 52CB
6427H Bars, forgings, and tubing, 0.88Cr 1.8Ni 0.42Mo 0.08V
(0.28–0.33C)
K23080 4330 Mod
6428D Bars, forgings, and tubing, 0.80Cr 1.8Ni 0.35Mo 0.20V
(0.32–0.38C)
K23477 4335 Mod
6429D Bars, forgings, tubing, and rings, 0.78Cr 1.8Ni 0.35Mo 0.20V (0.33–0.38C), consumable electrode vacuum melted
K33517 4335 Mod
6430D Bars, forgings, tubing, and rings, 0.78Cr 1.8Ni 0.35Mo 0.20V 0.75Mn (0.32–0.38C)
K33517 4335 Mod
6431J Bars, forgings, and tubing, 1.05Cr 0.55Ni 1.0Mo 0.11V
(0.45–0.50C), consumable electrode vacuum melted
K24728 D6 MIL-S-8949
6432A Bars, forgings, and tubing, 1.05Cr 0.55Ni 1.0Mo 0.12V
(0.43–0.49C)
K24728 D6A
6433D Sheet, strip, and plate, 0.80Cr 1.8Ni 0.35Mo 0.20V 0.75Mn (0.33–0.38C)
K33517 4335 Mod
Continued
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6434D Sheet, strip, and plate, 0.78Cr 1.8Ni
0.35Mo 0.20V (0.33–0.38C)
K33517 4335 Mod
6435C Sheet, strip, and plate, 0.78Cr 1.8Ni 0.35Mo 0.20V (0.33–0.38C), vacuum consumable electrode melted, annealed
K33517 4335 Mod
6436B Sheet, strip, and plate, low alloy, heat resistant, 0.65Si 1.25Cr 0.50Mo 0.85V (0.25–0.30C), annealed
K22770 17–22A(V)
6437D Sheet, strip, and plate, 5.0Cr 1.3Mo 0.50V (0.38–0.43C)
T20811 H-H
6438D Sheet, strip, and plate, 1.05Cr 0.55Ni 1.0Mo 0.12V (0.45–0.50C), consumable electrode vacuum melted
K24728 D6
6439B Sheet, strip, and Plate, 1.05Cr 0.55Ni 1.0Mo 0.12V (0.42–0.48C), consumable electrode vacuum melted, annealed
K24728 D6AC MIL-S-8949
6440J Bars, forgings, and tubing, 1.45Cr (0.98–1.10C), for bearing applications
G52986 52100
6442E Bars and forgings, 0.50Cr (0.98–1.10C), for bearing applications
G50986 50100 MIL-S-7420
6443E Bars, forgings, and tubing, 1.0Cr (0.98–1.10C), consumable electrode vacuum melted
G51986 51100
6444H Bars, forgings, and tubing, 1.45Cr (0.98–1.10C), premium aircraft quality, consumable electrode vacuum melted
G52986 52100
6445E Bars, forgings, and tubing, 1.05Cr 1.1Mn (0.92–1.02C), consumable electrode vacuum melted
K22097 51100 Mod
6446C Bars, forgings, and tubing, 1.0Cr (0.98–1.10C), electroslag remelted
G51986 51100
6447D Bars, forgings, and tubing, 1.4Cr (0.98–1.10C), electroslag remelted
G52986 52100
6448F Bars, forgings, and tubing, 0.95Cr 0.22V (0.48–0.53C)
G61500 6150 MIL-S-8503
6449C Bars, forgings, and tubing, 1.0Cr (0.98–1.10C), for bearing applications
G51986 51100 MIL-S-7420
Continued
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6450F Wire, spring, 0.95Cr 0.22V
(0.48–0.53C), annealed and cold drawn
G61500 6150
6451A Wire, spring, 1.4Si 0.65Cr (0.51–0.59C), oil tempered
G92540 9254
6452A Wire, welding, 0.95Cr 0.20Mo (0.38–0.43C), vacuum melted, environment controlled packaging
G43406 E4340 MIL-R-5632,
Type II
6453 Wire, welding, 0.30 Cr 1.8Ni 0.40Mo (0.23–0.28C), vacuum melted, environment controlled packaging
K 32550 Hy-Tuf
6454B Sheet, strip, and plate, 1.8Ni 0.8Cr 0.25Mo (0.38–0.43C),
consumable electrode melted
G43400 4340
6455G Sheet, strip, and plate, 0.95Cr 0.22V (0.48–0.53C)
G61500 6150 MIL-S-18731
6456A Wire, welding, 0.8Cr 1.8Ni 0.25Mo (0.35–0.40C), vacuum melted, environment controlled packaging
4340 Mod MIL-R-5632, Type III
6457A Wire, welding, 0.95Cr 0.20Mo (0.28–0.33C), vacuum melted, environment controlled packaging
K13147 4130 MIL-R-5632,
Type I
6458F Wire, welding, 1.25Cr 0.50Mo 0.30V 0.65Si (0.28–0.33C), vacuum melted, environment controlled packaging
K23015 17–22A(S)
6459B Wire welding, 1.0Cr 1.0Mo 0.12V (0.18–0.23C), vacuum induction melted
K22720
6460D Wire, welding, 0.62Cr 0.20Mo 0.75Si 0.10Zr (0.10–0.17C)
K11365 NAX-915-AC
6461G Wire, welding, 0.95Cr 0.20V (0.28–0.33C), vacuum melted, environment controlled packaging
K13148 6130
6462F Wire, welding, 0.95Cr 0.20V (0.28–0.33C)
K13149 6130
6463B Wire, welding, 18.5Ni 8.5Co 5.2Mo 0.72Ti 0.10A1, vacuum
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6465B Wire, welding, 2.0Cr 10Ni 8.0Co
1.0Mo 0.02A1 0.06V
6467C Electrode, welding, covered, 5Cr 0.55Mo
W50210 Type 502
6468B Wire, welding, 1.0Cr 3.8Co 0.45Mo 0.08V (0.14–0.17C), vacuum melted, environment controlled packaging
K91461 HP 9-4-20
6469A Wire, welding, 1.75Mn 0.80Cr 2.8Ni 0.85Mo (0.09–0.12C), vacuum melted, environment controlled packaging
— —
6470J Bars, forgings, and tubing, nitriding grade, 1.6Cr 0.35Mo 1.1A1 (0.38–
0.43C)
K24065 135 Mod MIL-S-6709
6471D Bars, forgings, and tubing, nitriding grade, 1.6Cr 0.35Mo 1.2A1 (0.38–
0.43C), consumable electrode vacuum melted
K24065 135 Mod
6472C Bars and forgings, nitriding grade, 1.6Cr 0.35Mo 1.1 A1 (0.38–
0.43C), hardened and tempered, 112 ksi (772 MPa) tensile strength
K24065 135 Mod MIL-S-6709
6473 Wire, welding, 0.88Cr 1.8Ni 1.6Co 0.42Mo 0.08V (0.28–0.33C), vacuum melted, environment controlled packaging
6475F Bars, forgings, and tubing, nitriding grade, 1.1Cr 3.5Ni 0.25Mo 1.25A1 (0.21–0.26C)
K52355
6476 Bars, forgings, and tubing, 0.50Cr 0.12Mo (0.89–1.01C), for bearing applications
6477 Bars, forgings, and tubing, 0.80Cr (0.90–1.03C), for bearing applications
6485G Bars and forgings, 5.0Cr 1.3Mo 0.50V (0.38–0.43C)
T20811 H-11 FED-QQ-T-570
Class H-11 6487G Bars and forgings, 5.0Cr 1.3Mo 0.50V
(0.38–0.43C), consumable electrode vacuum melted
T20811 H-11
6488E Bars and forgings, 5.0Cr 1.3Mo 0.5V (0.38–0.43C)
T20811 H-11
Continued
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6490D Bars, forgings, and tubing, 4.0Cr
4.2Mo 1.0V (0.77–0.85C),
6491A Bars, forgings, and tubing, 4.1Cr 4.2Mo 1.0V (0.80–0.85C), premium aircraft quality for bearing applications, Double vacuum melted
T11350 M-50
6501A Wire, welding, maraging steel, 18Ni 8.0Co 4.9Mo 0.40Ti 0.10A1, vacuum induction melted, environment controlled packaging
K92890 Maraging 250
6512C Bars, forgings, tubing, and rings, 18Ni 7.8Co 4.9Mo 0.40Ti
6514C Bars, forgings, tubing, and rings, Maraging, 18.5Ni 9Co 4.9Mo 6518A Sheet, strip, and plate, maraging,
19Ni 3.0Mo 1.4Ti 0.10A1, double vacuum melted, solution heat treated
6519A Bars, forgings, tubing, and rings, maraging, 19Ni 3.0Mo 1.4Ti 0.10A1, double vacuum melted, annealed
6520B Sheet, strip, and plate, maraging 250, 18Ni 7.8Co 4.9Mo 0.40Ti 0.10A1, consumable electrode melted, Solution heat treated
K92890 Maraging 250
6521A Sheet, strip, and plate, 18.5NI 9.0Co 4.9Mo 0.65Ti 0.10A1, consumable electrode melted, solution heat treated
K93120 Maraging 300 MIL-S-46850
Grade 300
6522A plate, 2.0Cr 10Ni 14Co 1.0Mo (0.13–0.17C), vacuum melted, normalized and overaged
K92571 AF-1410
6523C Sheet, strip, and plate, 0.75Cr 9.0Ni 4.5Co 1.0Mo 0.09V
ß2006 by Taylor & Francis Group, LLC.
TABLE 1.16 (Continued )
AMS Number, Title of Specification, and Equivalent UNS Number, Nearest Proprietary or AISI-SAE Grade, and Similar Specification for Wrought Alloy Steels
AMS No. Title of Specification UNS No. Alloy
Similar Specification 6524C Wire, welding, 1.0Cr 7.5Ni 4.5Co
1.0Mo 0.09V (0.29–0.34C), consumable electrode vacuum melted
K91313 HP 9–4–30
6525A Bars, forgings, tubing, and rings, 0.75Cr 9.0Ni 4.5Co 1.0Mo 0.09V (0.17–0.23C), consumable electrode vacuum melted
K91472 HP 9–4–20
6526C Bars, forgings, tubing, and rings, 1.0Cr 7.5Ni 4.5Co 1.0Mo 0.09V (0.29–0.34C), consumable electrode vacuum melted, annealed
K91283 HP 9–4–30
6527B Bars and forgings, 2.0Cr 10Ni 14Co 1.0Mo (0.15–0.19C), vacuum melted, normalized and overaged
K92571 AF 1410
6528 Bars, 0.95Cr 0.20Mo (0.28–0.33C), special aircraft quality
cleanliness, normalized
G41300 4130
6529 Bars, 0.95Cr 0.20Mo (0.38–0.43C), special aircraft quality
cleanliness, normalized
G41400 4140
6530H Tubing, seamless, 0.50Ni 0.55Cr 0.20Mo (0.28–0.33C)
G86300 8630
6532 Bars and forgings, 3.1Cr 11.5Ni 13.5Co 1.2Mo (0.21–0.25C), vacuum melted, annealed
K92580 Aermet 100
6533 Wire, welding, 2.0Cr 10Ni 14Co 1.9Mo (0.13–0.17C), vacuum melted, environment controlled packaging
K92571 AF 1410
6535G Tubing, seamless, 0.50Cr 0.55Ni 0.20Mo (0.28–0.33C)
G86300 8630
6543B Bars and forgings, 2.0Cr 10Ni 8.0Co 1.0Mo (0.10–0.14C), double vacuum melted, solution heat treated
K92571 AF 1410
6544B Plate, maraging, 2.0Cr 10Ni 8.0Co 1.0Mo (0.10–0.14C), double vacuum melted, heat treated
K91970
6546D Sheet, strip, and plate, 0.48Cr 0.80Ni 4.0Co 0.48Mo 0.09V (0.24–0.30C), consumable electrode melted, annealed
K91122 HP 9–4–25
6550H Tubing, Welded, 0.55Cr 0.50Ni 0.20Mo (0.28–0.33C)
G86300 8630 MIL-T-6734
Source: From 1994 SAE AMS Index, Society of Automotive Engineers, Warrendale, PA.
ß2006 by Taylor & Francis Group, LLC.
chemi cal and mecha nical prop erty requ irements, and testing an d inspect ion methods [61]. API Spe c 5LD co vers seaml ess, centrifugal cast, and welded clad steel line pipe and lined steel pipe with increa sed corrosi on-res istant pro perties. The clad and lined steel line pipes are c omposed of a base meta l outside and a corrosio n resistent alloy (CRA ) layer inside the pipe; the base mate rial conform s to AP I Spec 5L, ex cept as mod ified in the API Spec 5LC doc ument. This specif ication provides standar ds for pipe with impr oved corrosi on resi stance suitab le for use in con veying gas, water, and oil in both the oil an d natural gas indust ries [62] .