45Х - GOST 4543-1971

Grade	45Х
Corresponding Standard	GOST 4543-1971 Alloyed Construction Steel Specifications
Classification	Alloy Steel
Properties	High Hardenability

45Х Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.41	0.17	0.5	-	-	0.8	-	-
Maximum Value	0.49	0.37	0.8	0.035	0.035	1.1	0.3	0.3

• The letter A at the end of the grade stands for “high quality steel”. Character III means “Extra high quality steel”. For example, quality steel -30XΓC; High quality steel -30XΓCA; Extra high quality steel -30X ΓC-Ⅲ and 30XΓCA-Ⅲ.

1 Approximate Comparison Table Structural Alloy Steel

China		Taiwan, China	Japan	South Korea	United States		France	European Standard	Russia
GB	ISC	CNS	JIS	KS	ASTM/AISI	UNS	NF EN/NF	EN	GOST
45Cr	A20452	SCr445	SCr445	SCr445	5145	G51450	45C4	41Cr4	45Х

2 Approximate Comparison Table Hardenability Guaranteed Structural Steel

China		United States		International Organization for Standardization	France	Russia	United Kingdom
GB	ISC	ASTM	UNS	ISO	NF EN/NF	GOST	BS EN/BS
45CrH	A20455	5145H	H51450	≈41Cr4H	≈41Cr4	45Х	≈41Cr4

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