40CrNi2MoA 4340 - GB /T 38809-2020

Grade	40CrNi2MoA
China ISC	4340
Corresponding Standard	GB /T 38809-2020 General specification for low alloy ultra-high strength steels
Classification	Alloy Steel

40CrNi2MoA Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.38	0.2	0.65	-	-	0.7	1.65	-	0.2
Maximum Value	0.43	0.35	0.9	0.01	0.01	0.9	2	0.2	0.3

40CrNi2MoA Mechanical Properties

nominal dimension 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 %	Impact Energy Absorption KV2 J
≤300	Sampling Direction Longitudinal	Group Ι Heat treatment	≥1080	≥980	≥12	≥45	KU2 ≥47
80~300	Sampling Direction: Transverse	Group II Heat treatment	≥1794	≥1497	≥6	≥25	-

40CrNi2MoA Corresponding Standards(Same grade name, different standards)

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