Y35 U71351 - GB /T 8731-2025

Grade	Y35
China ISC	U71351
Corresponding Standard	GB /T 8731-2025 Free-Cutting Structural Steels
Classification	Carbon Steel

Y35 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S
Minimum Value	0.32	-	0.7	-	0.08
Maximum Value	0.4	0.4	1	0.06	0.15

Y35 Mechanical Properties

diameter d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %	Hardness HBW
d≤20 (Sample Diameter)	Hot Rolled (forged）	510~655		≤187
8＜d≤20 (nominal size)	Cold Drawn	625~845	≥6	176~229
20＜d≤30 (nominal size)	Cold Drawn	590~785	≥6	176~229
d > 30 (nominal size)	Cold Drawn	570~765	≥6	176~229

1 Approximate Comparison Table Free-Cutting Structural Steel

China		United States	International Organization for Standardization	Germany		France	European Standard		Sweden	United Kingdom
GB	ISC	ASTM/AISI	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	EN	Numerical Grade	SS₁₄	BS EN/BS
Y35 Y30	U70352	1140	35S20	35S20	1.0726	35MF6	35S20	1.0726	1957	212M36

2 Approximate Comparison Table Free-Cutting Structural Steel

China	United States	International Organization for Standardization	Germany	France	European Standard		Sweden	United Kingdom
GB	ASTM/AISI	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	SS	BS EN/BS
Y35	1140	35S20	35S20	35MF6	35S20	1.0726	1957-03	212M36

Y35 Corresponding Standards(Same grade name, different standards)

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