40CrNi2Si2MoVA 300M - GJB 5063-2001

Grade	40CrNi2Si2MoVA
	300M
Corresponding Standard	GJB 5063-2001 Specification for ultra-high strength steel bars for aviation and areospace
Classification	Alloy Steel

40CrNi2Si2MoVA Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	V
Minimum Value	0.38	1.45	0.6	-	-	0.7	1.65	-	0.3	0.05
Maximum Value	0.43	1.8	0.9	0.01	0.01	0.95	2	0.35	0.5	0.1

40CrNi2Si2MoVA 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
s≤645	Sampling Direction Longitudinal	Heat Treatment	≥1860	≥1515	≥8	≥30		KU2 ≥39
645＜s≤920	Sampling Direction: Transverse	Heat Treatment	≥1860	≥1515	-	≥25		KU2 ≥23
Steel Rod		Annealing or High-Temperature Tempering					≤241

40CrNi2Si2MoVA Corresponding Standards(Same grade name, different standards)

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