40CrNi2MoA 4340 - GJB 5063-2001

Grade	40CrNi2MoA
	4340
Corresponding Standard	GJB 5063-2001 Specification for Ultra-High Strength Steel Bars for Aviation and Areospace
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	0.35	0.3

40CrNi2MoA Mechanical Properties

section area	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
sample	Sampling Direction Longitudinal	Heat Treatment	≥1080	≥980	≥12	≥45		KU2 ≥47
Steel Rod		Normalizing + Tempering					HRC ≤33

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

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