20CrNi3A - GJB 1951-1994

Grade	20CrNi3A
Corresponding Standard	GJB 1951-1994 Specification for Quality Structure Steel Bars for Avication
Classification	Alloy Steel

20CrNi3A Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu ^*	Mo ^*	Ti ^*	W ^*	V ^*
Minimum Value	0.17	0.17	0.3	-	-	0.6	2.75	-	-	-	-	-
Maximum Value	0.25	0.37	0.6	0.03	0.03	0.9	3.25	0.25	0.15	0.03	0.2	0.05

20CrNi3A Mechanical Properties

condition	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
Steel Rod	Tempering or annealing					163~241
Longitudinal specimen d=25①	Quenching 850~840°C oil or warm water cooling, Tempering 400~500°C oil or cold	≥980	≥835	≥10	≥55	293~341	≥78

20CrNi3A Corresponding Standards(Same grade name, different standards)

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