40CrMnMo - GJB 1220A-2008

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

40CrMnMo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.37	0.17	0.9	-	-	0.9	-	-	0.2
Maximum Value	0.45	0.37	1.2	0.03	0.03	1.2	0.3	0.25	0.3

40CrMnMo 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=15	850°C Quenching, Oil Quenching, 600°C Tempering, Water or Oil Quenching	≥980	≥785	≥10	≥45	-	KU2 ≥71
Steel	Annealing or Tempering	-	-	-	-	≤217	-

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

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