AISI 4140 (0.40% C)

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Values marked * are estimates. Values marked * are estimates. No warranty is given for the accuracy

No warranty is given for the accuracy of this datof this dataa

Identification

Designation Designation AI AISI SI 41404140 Condition Condition An Annealnealeded UNS number UNS number G41400 G41400 US name US name SAE H41400, SAE

SAE H41400, SAE 4140, SAE 4142, SAE 4140, SAE 4142, SAE 4140, AST4140, ASTM J M J 70, ASTM 70, ASTM J J 65, 65, ASTM ASTM J J 55, 55, ASTM ASTM 4140, ASTM 4140, ASTM G414G41420,20, AS

ASTM TM E7E7140, 140, ASASTM TM B7MB7M, , ASASTM TM B16B16, , ASASTM TM 41424142H, H, ASASTM TM 4144142, 2, ASASTM TM 41404140H, H, ASASTM TM 41404140, , ASASTM TM 41374137H, H, ASASTM TM 41,41, ~SAE 4137H, ~ASTM B4D, ~ASTM 6

~SAE 4137H, ~ASTM B4D, ~ASTM 6 EN name EN name ~42CrMoS4, ~42CrMo4 ~42CrMoS4, ~42CrMo4 EN number EN number ~1.7227, ~1.7223 ~1.7227, ~1.7223 ISO name ISO name

~ 42 CrMoS 4, ~ 42 CrMo 4, ~42CrMo4 ~ 42 CrMoS 4, ~ 42 CrMo 4, ~42CrMo4 GB (Chinese) name

GB (Chinese) name ~42CrMo

~42CrMo

JIS (Japanese) name JIS (Japanese) name

SNB22-5, SNB22-4, SNB22-3, SNB22-2 SNB22-5, SNB22-4, SNB22-3, SNB22-2 Tradenames

Tradenames

TKS 42CRMO4, ThyssenKrupp Stahl AG (GERMANY); LASALLE 4140, LaSalle Steel Co. (USA); A-1252, AFORA TKS 42CRMO4, ThyssenKrupp Stahl AG (GERMANY); LASALLE 4140, LaSalle Steel Co. (USA); A-1252, AFORA (Aceros Afora S.A.) (SPAIN); A-1250, AFORA (Aceros Afora S.A.) (SPAIN);

(Aceros Afora S.A.) (SPAIN); A-1250, AFORA (Aceros Afora S.A.) (SPAIN);

General Properties

Density Density 77..88ee33 -- 7..979ee33 kkgg//mm^^33 Price Price * 1* 1..2233 -- 11..3355 BBRRLL//kkgg

Composition overview

Composition (summary) Composition (summary) Fe/0.8-1.1Cr/0.75-1Mn/0.

Fe/0.8-1.1Cr/0.75-1Mn/0.38-0.43C/0.15-0.35Si38-0.43C/0.15-0.35Si/0.15-0.25Mo//0.15-0.25Mo/<0.04S/<0.<0.04S/<0.035P035P Base

Base Fe (Iron)Fe (Iron)

Composition detail (metals, ceramics and glasses)

C (carbon) C (carbon) 00..3388 -- 00..4433 %% Cr (chromium) Cr (chromium) 00..88 -- 11..11 %% Fe (iron) Fe (iron) 9966..88 -- 9977..88 %% Mn (manganese) Mn (manganese) 00..7755 -- 11 %% Mo (molybdenum) Mo (molybdenum) 00..1155 -- 00..2255 %% P (phosphorus) P (phosphorus) 00 -- 00..003355 %% S (sulfur) S (sulfur) 00 -- 00..0044 %% Si (silicon) Si (silicon) 00..1155 -- 00..3355 %%

Mechanical properties

Young's modulus Young's modulus 220088 -- 221166 GGPPaa Flexural modulus Flexural modulus ** 220088 -- 221166 GGPPaa Shear modulus Shear modulus 8800 -- 8855 GGPPaa Bulk modulus Bulk modulus 116611 -- 117766 GGPPaa Poisson's ratio Poisson's ratio 00..228855 -- 00..229955

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Shape factor 54

Yield strength (elastic limit) 370 - 460 MPa

Tensile strength 595 - 720 MPa

Compressive strength * 370 - 460 MPa

Flexural strength (modulus of rupture) 370 - 460 MPa

Elongation 20 - 31 % strain

Hardness - Vickers 183 - 223 HV

Fatigue strength at 10^7 cycles * 297 - 341 MPa Fatigue strength model (stress range) * 183 - 248 MPa

Parameters: Stress Ratio = 0, Number of Cycles = 1e7

Fracture toughness * 76 - 120 MPa.m^0.5

Mechanical loss coefficient (tan delta) * 7.2e-4 - 9e-4

Thermal properties

Melting point 1.43e3 - 1.5e3 °C

Maximum service temperature * 613 - 650 °C

Minimum service temperature * -73 - -48 °C

Thermal conductivity 42 - 48 W/m.°C

Specific heat capacity 450 - 490 J/kg.°C

Thermal expansion coefficient 11.5 - 13.5 µstrain/°C

Latent heat of fusion * 265 - 280 kJ/kg

Processing properties

Carbon equivalency 0.34 - 0.495

Electrical properties

Electrical resistivity 20 - 25 µohm.cm

Galvanic potential * -0.5 - -0.42 V

Optical properties

Transparency Opaque

Durability: flammability

Flammability Non-flammable

Durability: fluids and sunlight

Water (fresh) Acceptable

Water (salt) Limited use

Weak acids Limited use

Strong acids Unacceptable

Weak alkalis Acceptable

Strong alkalis Limited use

Organic solvents Excellent

UV radiation (sunlight) Excellent

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Values marked * are estimates.

No warranty is given for the accuracy of this data

Rough rolling, forging energy * 3.61 - 3.99 MJ/kg Extrusion, foil rolling energy * 6.94 - 7.67 MJ/kg

Wire drawing energy * 25.2 - 27.9 MJ/kg

Metal powder forming energy * 37.5 - 41.4 MJ/kg

Vaporization energy * 1.09e4 - 1.2e4 MJ/kg

Coarse machining energy (per unit wt removed) * 0.974 - 1.08 MJ/kg Fine machining energy (per unit wt removed) * 5.47 - 6.04 MJ/kg Grinding energy (per unit wt removed) * 10.5 - 11.6 MJ/kg Non-conventional machining energy (per unit wt removed) * 109 - 120 MJ/kg

Material processing: CO2 footprint

Casting CO2 * 0.808 - 0.893 kg/kg

Rough rolling, forging CO2 * 0.271 - 0.3 kg/kg Extrusion, foil rolling CO2 * 0.521 - 0.575 kg/kg

Wire drawing CO2 * 1.89 - 2.09 kg/kg

Metal powder forming CO2 * 3 - 3.32 kg/kg

Vaporization CO2 * 815 - 901 kg/kg

Coarse machining CO2 (per unit wt removed) * 0.0731 - 0.0808 kg/kg Fine machining CO2 (per unit wt removed) * 0.41 - 0.453 kg/kg Grinding CO2 (per unit wt removed) * 0.785 - 0.867 kg/kg Non-conventional machining CO2 (per unit wt removed) * 8.15 - 9.01 kg/kg

Material recycling: energy, CO2 and recycle fraction

Recycle

Embodied energy, recycling * 7.73 - 8.54 MJ/kg CO2 footprint, recycling * 0.608 - 0.671 kg/kg Recycle fraction in current supply 39.9 - 44 % Downcycle

Combust for energy recovery Landfill

Biodegrade

A renewable resource?

Notes

Typical uses

Heavy duty shafts; Connecting rods; High tensile bolts; Propeller shaft joints; Track pins; Other notes

Wear resistant - may be nitrided for extreme surface hardness. Tempering at high temperatures gives high tensile strength, good ductility and shock resistance.

Keywords

TKS 42CRMO4, ThyssenKrupp Stahl AG (GERMANY); LASALLE 4140, LaSalle Steel Co. (USA); A-1252, AFORA (Aceros Afora S.A.) (SPAIN); A-1250, AFORA (Aceros Afora S.A.) (SPAIN);

Reference sources

Data compiled from multiple sources. See links to the References table. Standards with similar compositions

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The following information is taken from ASM AlloyFinder 3 - see link to References table for further information. IAS IRAM 4140 (Argentina)

ONORM M3167 42CrMo4SP (Austria) ONORM M3170 StL5 (Austria) NBN 253-02 41CrMo4 (Belgium) NBN 253-02 42CrMo4 (Belgium) BDS 6354 40ChMA (Bulgaria) GB 3077(88) 42CrMnMo (China) GB 3077(88) 42CrMo (China) GB 8162(87) 42CrMo (China) GB/T 3078(94) 42CrMnMo (China) GB/T 3078(94) 42CrMo (China) SFS 459(73) SFS459 (Finland) SFS 460 Co.42Cr1.1Mo0.20 (Finland) SFS 460(73) SFS460 (Finland) AFNOR NFA35552 42CD4 (France) AFNOR NFA35552 42CDTS (France) AFNOR NFA35553 42CD4 (France) AFNOR NFA35553 42CDTS (France) AFNOR NFA35556 42CDTS (France) AFNOR NFA35556(84) 42CD4 (France) AFNOR NFA35557 42CD4 (France) AFNOR NFA35557 42CDTS (France) AFNOR NFA35564(83) 42CD4FF (France)

DIN 1652(90) 42CrMo4 (Germany) DIN 1652(90) 42CrMoS4 (Germany) DIN 1652(90) WNr 1.7225 (Germany) DIN 1652(90) WNr 1.7227 (Germany) DIN EN 10083(91) 42CrMo4 (Germany) MSZ 61(85) CMo4 (Hungary) MSZ 61(85) CMo4E (Hungary) MSZ 6251(87) CMo4Z (Hungary) IS 1570 40Cr1Mo28 (India) IS 4367 40Cr1Mo28 (India) IS 5517 40Cr1Mo28 (India) UNI 5332(64) 40CrMo4 (Italy) UNI 7847(79) 41CrMo4 (Italy) UNI 8551(84) 41CrMo4 (Italy) JIS G3311(88) SCM440M (Japan) JIS G3311(88) SCM4M (Japan) JIS G4105(79) SCM 4 (Japan) JIS G4105(79) SCM440 (Japan) JIS G4107(94) SNB7 (Japan) DGN B-203 4140 (Mexico) DGN B-297 4140 (Mexico) NMX-B-300(91) 4140 (Mexico) NS CrMoIV (Norway) AS 1444(96) 4140 (NSW Australia) AS G18 En19 (NSW Australia) AS G18 En19A (NSW Australia)

PNH84030/04 40HM (Poland)

STAS 10677(84) 41MoCr11CS (Romania) STAS 8185(88) 41MoCr11 (Romania) STAS 9382/4 41MoCr11q (Romania) GOST 4543 38ChM (Russian Federation) GOST 4543 40ChMFA (Russian Federation) GOST 4543(71) 38ChM (Russian Federation) UNE 36012(75) 40CrMo4 (Spain)

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Values marked * are estimates.

No warranty is given for the accuracy of this data

Links

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