4140 - ASTM A519/A519M-2024

Grade	4140
Corresponding Standard	ASTM A519/A519M-2024 Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing
Classification	Alloy Steel

4140 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni ^*	Cu ^*	Mo
Minimum Value	0.38	0.15	0.75	-	-	0.8	-	-	0.15
Maximum Value	0.43	0.35	1	0.04	0.04	1.1	0.25	0.35	0.25

4140 Mechanical Properties

condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
HR-Hot rolled	825	620	15	HRB 100
SR-Stress Relieved	825	690	10	HRB 100
A-Annealed	550	415	25	HRB 85
N-Normalized	825	620	20	HRB 100

1 Approximate Comparison Table Alloy Steel for Quenching and Tempering

United States	International Organization for Standardization	Germany	France	European Standard
ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade
4140	42CrMoS4	42CrMoS4	42CD4u	42CrMoS4	1.7227

2 Approximate Comparison Table Structural Alloy Steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
42CrMo	SCM440H	4140 4142	42CrMo4	42CrMo4	42CD4	42CrMo4	1.7225	35KHM 38KHM	2244	708M40 CFS11

3 Approximate Comparison Table Structural Alloy Steel

4 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China	Japan	United States	International Organization for Standardization	European Standard
GB	JIS	ASTM	ISO	EN
ML40CrMo	SCM440	4140	42CrMo4	42CrMo4

5 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China		Japan	United States	International Organization for Standardization	European Standard
YB	GB	JIS	ASTM	ISO	EN
QML40CrMo	ML40CrMo	SCM440	4140	42CrMo4	42CrMo4

4140 Corresponding Standards(Same grade name, different standards)

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