20CrMo 4 - ISO 683-17-2014

Grade	20CrMo 4
Corresponding Standard	ISO 683-17-2014 Heat-Treated Steels, Alloy Steels and Free-Cutting Steels - Part 17: Ball and Roller Bearing Steels
Classification	Bearing Steel

20CrMo 4 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Cu	Mo	Al	O ^①
Minimum Value	0.17	-	0.6	-	-	0.9	-	0.15	-	-
Maximum Value	0.23	0.4	0.9	0.025	0.015	1.2	0.3	0.25	0.05	0.002

Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China	Japan	United States	International Organization for Standardization
GB	JIS	ASTM	ISO
ML20CrMo	SCM420	4120	20CrMo4

20CrMo4 Corresponding Standards(Same grade name, different standards)

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