Y15Mn U71156 - GB /T 8731-2008

Grade	Y15Mn
China ISC	U71156
Corresponding Standard	GB /T 8731-2008 Free-Cutting Structural Steel
Classification	Carbon Steel

Y15Mn Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S
Minimum Value	0.14	-	1	0.04	0.08
Maximum Value	0.2	0.15	1.5	0.09	0.13

Y15Mn Mechanical Properties

diameter d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
d=20 (Sample Diameter)	Hot Rolled Delivery Condition	390~540	≥22	≥36	≤170
d = 8~20 (steel size)	Cold Drawn State Delivery	530~755	≥7		152~217
d > 20 ~ 30 (steel size)	Cold Drawn State Delivery	510~735	≥7		152~217
d > 30 (steel size)	Cold Drawn State Delivery	490~685	≥7		152~217

Approximate Comparison Table Free-Cutting Structural Steel

China	Japan	United States	International Organization for Standardization
GB	JIS	ASTM/AISI	ISO
Y15Mn GB/T 8731-2025	SUM31 JIS G4804-2021	1117 ASTM A29/A29M-20	15SMn13 ISO 683-4-2016

Y15Mn 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"!