20Cr4H (4) 20Cr4 20Cr4HH - ISO 683-11-1987

Grade	20Cr4H
ISO Numeric Designation	(4)
Other Names
Corresponding Standard	ISO 683-11-1987 Heat-treatable steels, alloy steels and free-cutting steels -- part 11: case-hardening steel
Classification	Alloy Steel
Properties	Quench Hardness

20Cr4H Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr
Minimum Value	0.17	0.15	0.6	-	-	0.9
Maximum Value	0.23	0.4	0.9	0.035	0.035	1.2

1 Approximate Comparison Table Hardenability Guaranteed Structural Steel

China		Japan	South Korea	United States		International Organization for Standardization	Germany		France	Russia	United Kingdom
GB	ISC	JIS	KS	ASTM	UNS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	BS EN/BS
20CrH	A20205	≈SCr420H	≈SCr420H	5120H	H51200	≈20Cr4H	20Cr4	1.7027	(20MC5)	20Х	(527H17)

2 Approximate Comparison Table Hardenability Guaranteed Structural Steel

China		Taiwan, China	Japan	South Korea	United States		International Organization for Standardization	Germany		Russia
GB	ISC	CNS	JIS	KS	ASTM	UNS	ISO	DIN EN/DIN	W-Nr.	GOST
20Cr1H	A20215	SCr420H	SCr420H	SCr420H	≈5120H	≈H51200	20Cr4H	≈20Cr4	≈1.7027	20Х

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