Free cutting steel Y40Mn centerless polishing rod Small light round size grinding rod

Product name: Free cutting steel

Brand: Y40Mn

Standard: GB/T8731-88 GB/T8731-2008

Product process: cold drawing, grinding

Product shape: round rod, hexagonal rod, square rod, shaped material

Free cutting steel for use

Used as turning steel, widely used in structural parts. Commonly used in the manufacture of more important mechanical parts, parts such as machine screws, self-tapping screws, bolts, nuts, double heads, headless parts, hex bolts and so on.

Chemical composition:

Carbon C: 0.37 ~ 0.45

Silicon Si: 0.15 ~ 0.35

Manganese Mn: 1.20 ~ 1.55

Sulfur S: 0.20 ~ 0.30

P: ≤0.05

Mechanical properties of hot rolling

Tensile strength Rm/ (N/ mm2) (hot rolled)610 ~ 900;

Elongation after breaking A (%) : (hot rolling)≥12;

Section shrinkage Z/(%) : (hot rolling)≥20

Brinell hardness: (hot rolling)≤241HBW;

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