T7 - GB 3525-1983

Grade	T7
Corresponding Standard	GB 3525-1983 Cold-Rolled Spring and Steel Strips
Classification	Carbon Steel

T7 Mechanical Properties

thickness t mm	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %
t ≤ 1.5, annealed steel strip	≤635	≥20
t > 1.5, annealed steel strip	≤735	≥15
Cold-Hard Steel Strip	735~1175

1 Approximate Comparison Table Carbon Tool Steel

China		Japan	International Organization for Standardization	European Standard
GB	ISC	JIS	Numerical Grade	EN
T7	T00070	SK70	C70U	C70U

2 Approximate Comparison Table Non-Alloy Cold-Work Tool Steels

China	Japan	United States	International Organization for Standardization	Germany		France	European Standard		Russia
GB	JIS	ASTM	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	EN	Numerical Grade	GOST
T7	SK6 SK7	W1-7	C70U	C70W2	1.1620	C70E2U	C70U	1.1520	U7

3 Approximate Comparison Table Carbon Tool Steel

China		Japan	International Organization for Standardization	Germany		France	Russia	United Kingdom
GB	ISC	JIS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	BS EN/BS
T7	T00070	SK65 (SK7)	TC70	C70W2	1.1620	Y1 70	У7	RWB0.7

4 Approximate Comparison Table Carbon Tool Steel 1

China		Taiwan, China	Japan	South Korea	International Organization for Standardization	Germany		France	Russia	Sweden	United Kingdom
GB	ISC	CNS	JIS	KS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	SS	BS EN/BS
T7	T00070	SK 7	SK 70	STC 7	C70U	C70W2	1.1620	C70U C70E2U	У7-1	1770	C70U

T7 Corresponding Standards(Same grade name, different standards)

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