Easy cut steel Y40Mn steel rod bright round rod cold drawn round steel

Product name: Free cutting steel

Grade: Y40Mn free cutting steel

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

Product process: polishing, 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;

Mechanical properties of cold drawn steel

Tensile strength Rm/ (N/ mm2) (cold drawn) φ8-φ20:610 ~ 900; > φ20 ~ 30:65 ~ 880; > φ 30:580-880

Elongation after breaking A (%) : (cold drawing)≥6;

Brinell hardness: (cold drawn)≤196 ~ 255HBW;

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