20CrMnSi - GJB 1220A-2008

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

20CrMnSi Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.17	0.9	0.8	-	-	0.8	-	-
Maximum Value	0.23	1.2	1.1	0.03	0.03	1.1	0.3	0.25

20CrMnSi 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=25	880°C Quenching, Oil Quenching, 480°C Tempering, Water or Oil Quenching	≥785	≥635	≥12	≥45	-	KU2 ≥55
Steel	Annealing or Tempering	-	-	-	-	≤207	-

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

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