40CrMnMo A34401 - GB /T 37618-2019

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	0.3	0.3

40CrMnMo Mechanical Properties

test size d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW	Impact Energy Absorption KV2 J
d=25	Quenching temperature 850±15°C, oil quenching; tempering temperature 650±50°C, water or oil quenching	≥980	≥785	≥10	Normalizing + Tempering, Annealing or High Temperature Tempering Condition Delivered Steel Rod ≤217	KU2 ≥63

1 Approximate Comparison Table structural alloy steel

China		Japan	South Korea	United States		International Organization for Standardization	Germany		Russia	United Kingdom
GB	ISC	JIS	KS	ASTM/AISI	UNS	ISO	DIN EN/DIN	W-Nr.	GOST	BS EN/BS
40CrMnMo	A34402	SCM440	SCM440	4142 4140	G41420	42CrMo4	42CrMo4	1.7225	40ХГМ	708A42

2 Approximate Comparison Table structural alloy steel

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

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