40CrNiMoA - GJB 1220A-2008

Grade	40CrNiMoA
Corresponding Standard	GJB 1220A-2008 Speification for alloy structure steel bar for artillery parts
Classification	Alloy Steel

40CrNiMoA 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	0.025	0.025	0.9	1.65	0.25	0.25

40CrNiMoA 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	850°C Quenching, Oil Quenching, 600°C Tempering, Water or Oil Quenching	≥980	≥835	≥12	≥55	-	KU2 ≥78
Steel	Annealing or Tempering	-	-	-	-	≤269	-

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

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