65 U20652 - GB /T 1222-2025

65 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.62	0.17	0.5	-	-	-	-	-
Maximum Value	0.7	0.37	0.8	0.025	0.02	0.25	0.35	0.2

65 Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %
Quenched in oil at 840±20°C and tempered at 500±50°C	≥980	ReL ≥785	≥9	≥35

1 Approximate Comparison Table High-Quality Carbon Structural Steel

China		United States		International Organization for Standardization	Germany		France	Russia	Sweden	United Kingdom
GB	ISC	ASTM/AISI	UNS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	SS	BS EN/BS
65	U20652	1065	G10650	SL SM	Ck67	1.1231	XC65	65	1770	060A67

2 Approximate Comparison Table Spring Steel

China		Japan	United States		International Organization for Standardization	Germany		France	Russia	Sweden	United Kingdom
GB	ISC	JIS	AISI	UNS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	SS₁₄	BS EN/BS
65	U20652	SUP2	1065	G10650	Type DC	Ck67	1.1231	XC65	65	1770	060A67

3 Approximate Comparison Table High-Quality Carbon Structural Steel

4 Approximate Comparison Table Spring Steel

China		Japan	United States	International Organization for Standardization	European Standard
GB	ISC	JIS	ASTM/AISI	ISO	EN	Numerical Grade
65 (GB/T 1222-2016)	U20652	S65-CSP (JIS G4802:2005)	1065 (ASTM A29/A29M:2005)	C60E4 (ISO 683-18:1996)	C60E (EN 10083-1:1991+A1:1996)	1.1221

5 Approximate Comparison Table Spring Steel 1

6 Approximate Comparison Table Spring Steel 1

65 Corresponding Standards(Same grade name, different standards)

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