40CrNiMoA - GJB 1951-1994

Grade	40CrNiMoA
Corresponding Standard	GJB 1951-1994 Specification for Quality Structure Steel Bars for Avication
Classification	Alloy Steel
Properties	Strength Hardness Machinability Quench Hardness Carburizing Ability

40CrNiMoA Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Ti ^*	W ^*	V ^*
Minimum Value	0.36	0.17	0.5	-	-	0.6	1.25	-	0.15	-	-	-
Maximum Value	0.44	0.37	0.8	0.025	0.025	0.9	1.75	0.25	0.25	0.03	0.2	0.05

40CrNiMoA Mechanical Properties

diameter d mm	Mark	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
Steel Rod		Annealing + tempering					170~269
Longitudinal specimen d=25①	ⓐ	Quenching + Tempering	≥1080	≥930	≥12	≥50	321~375	≥63
Transverse sample d=25①	ⓐ	Quenching + Tempering	≥970	≥840	≥6	≥30		≥31
Transverse sample d=25①	ⓑ	Quenching + Tempering	≥980	≥835	≥12	≥55	293~341	≥78
Transverse sample d=25①	ⓑ	Quenching + Tempering	≥880	≥750	≥6	≥33		≥39
Longitudinal sample d=25②	Pre-normalizing is allowed	Quenching 850±10°C oil cooling, Tempering 550~650°C water or air cooling	≥980	≥835	≥11	≥45	293~341	≥71

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

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