20Cr2Ni4A - GJB 1220A-2008

Grade	20Cr2Ni4A
Corresponding Standard	GJB 1220A-2008 Speification for alloy structure steel bar for artillery parts
Classification	Alloy Steel

20Cr2Ni4A Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.17	0.17	0.3	-	-	1.25	3.25	-
Maximum Value	0.23	0.37	0.6	0.025	0.025	1.65	3.65	0.25

20Cr2Ni4A Mechanical Properties

diameter d mm	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
d=15	880°C First Quenching, 780°C Second Quenching, Oil Cooling, 200°C Tempering, Water or Air Cooling	≥1180	≥1080	≥10	≥45	-	KU2 ≥63
Steel	Annealing or Tempering	-	-	-	-	≤269	-

20Cr2Ni4A Corresponding Standards(Same grade name, different standards)

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