20Cr - GJB 1220A-2008

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

20Cr Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.18	0.17	0.5	-	-	0.7	-	-
Maximum Value	0.24	0.37	0.8	0.03	0.03	1	0.3	0.25

20Cr 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, 780~820°C Second Quenching, Water or Oil Cooling, 200°C Tempering, Water or Air Cooling	≥835	≥540	≥10	≥40	-	KU2 ≥47
Steel	Annealing or Tempering	-	-	-	-	≤179	-

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

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!