40CrNiMo A50402 - GB /T 3077-2015

Grade	40CrNiMo
China ISC	A50402
Corresponding Standard	GB /T 3077-2015 Alloy Structure Steels
Classification	Alloy Steel
Properties	Strength Hardness Machinability Quench Hardness Carburizing Ability
Density	7.85 g/cm³

40CrNiMo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.37	0.17	0.5	-	-	0.6	1.25	-	0.15
Maximum Value	0.44	0.37	0.8	0.03	0.03	0.9	1.65	0.3	0.25

40CrNiMo Mechanical Properties

diameter d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
d=25	Quenching + Tempering	≥980	≥835	≥12	≥55	≤269	≥78

1 Approximate Comparison Table Alloy Steel for Quenching and Tempering

China	International Organization for Standardization
GB	ISO
40CrNiMo	36CrNiMo4

2 Approximate Comparison Table Structural Alloy Steel

3 Approximate Comparison Table Structural Alloy Steel

4 Approximate Comparison Table Structural Alloy Steel

40CrNiMo Corresponding Standards(Same grade name, different standards)

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