Y15S U71152 - GB /T 8731-2025

Grade	Y15S
China ISC	U71152
Corresponding Standard	GB /T 8731-2025 Free-Cutting Structural Steels
Classification	Carbon Steel

Y15S Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S
Minimum Value	0.1	-	0.8	0.05	0.23
Maximum Value	0.18	0.15	1.2	0.1	0.33

Y15S 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）	390~540		≤170
8＜d≤20 (nominal size)	Cold Drawn	530~755	≥7	152~217
20＜d≤30 (nominal size)	Cold Drawn	510~735	≥7	152~217
d > 30 (nominal size)	Cold Drawn	490~685	≥7	152~217

New and Old Grade Replacement List

Approximate Comparison Table Free-Cutting Structural Steel

China		Japan	United States	International Organization for Standardization	Germany		France
GB	ISC	JIS	ASTM/AISI	ISO	DIN EN/DIN	W-Nr.	NF EN/NF
Y15	U71152	SUM22	1213	11SMn28	15S20	1.0723	15F2

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