Executive Standard: JIS G4804-1999
● Features and application:
Is sulfur free-cutting carbon steel, has a good cutting performance, compared with 45 steel tool life can be increased four times, improve production efficiency by 30%, with high strength and hardness, high rigidity required for processing parts, such as screw, rod, rack-and-spline shaft.
● 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
● 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
● Heat treatment and microstructure specifications:
● Delivery status: the hot-rolled or cold-drawn state of delivery, delivery status should be indicated in the contract.
