Standard
GB / T 8731-1988
Chemical composition
Carbon C: 0.37 ~ 0.45
Si Si: 0.15 ~ 0.35
Manganese Mn: 1.20 ~ 1.55
Sulfur S: 0.02 ~ 0.30
Phosphorus P: ≤ 0.05
Advantage
Shape of the size diversity
Through the design of the mold different shapes, different cross-sectional shapes cold out, different specifications of steel-cutting tolerances. Angle at right angles or rounded.
High accuracy
Use high-quality carbide tooling, to ensure accurate tolerance, unity.
Smooth surface
Advanced cold-cutting extrusion process makes the surface smooth and bright steel products.
Mechanical properties
Tensile strength σb (MPa): (hot) 590 - 735; (cold-drawn state after high-temperature tempering) 590 - 785
Elongation δ5 (%):( hot) ≥ 14; (cold) ≥ 17
Reduction of ψ (%):( hot) ≥ 20
Hardness
(Hot) ≤ 207HB; (cold drawing) 179 ~ 229HB
Delivery status
To hot-rolled or cold-drawn state of delivery, delivery status should be indicated in the contract.
