Y45Sn U74451 - GB /T 8731-2025

Grade	Y45Sn
China ISC	U74451
Corresponding Standard	GB /T 8731-2025 Free-Cutting Structural Steels
Classification	Carbon Steel
Properties	Good Machinability

Y45Sn Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Sn
Minimum Value	0.4	-	0.6	0.03	-	0.09
Maximum Value	0.48	0.4	1	0.07	0.05	0.25

Y45Sn 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）	600~745		≤241
8＜d≤20 (nominal size)	Cold Drawn	695~920	≥6	196~255
20＜d≤30 (nominal size)	Cold Drawn	655~855	≥6	196~255
d > 30 (nominal size)	Cold Drawn	635~835	≥6	196~255

Y45Sn 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"!