SUM42 cutting steel:
Standard: JIS G4804-1999
● Features and Scope:
Is sulfur free cutting carbon steel, better cutting performance, compared with 45 steel can improve tool life fourfold increase productivity 30%, a higher strength and hardness, high stiffness suitable processing requirements parts, such as screw, rod, rack and spline shaft.
● Chemical Composition:
Carbon C: 0.37 ~ 0.45
Si Si: 0.15 ~ 0.35
Mn Mn: 1.20 ~ 1.55
Sulfur S: 0.02 ~ 0.30
Phosphorus P: ≤0.05
● Mechanical Properties:
Tensile strength σb (MPa) :( hot) 590 to 735; (cold-drawn after tempering state) 590 to 785
Elongation δ5 (%) :( hot rolled) ≥14; (rolled) ≥17
Reduction of area ψ (%) :( hot rolled) ≥20
Hardness :( hot) ≤207HB; (cold drawing) 179 ~ 229HB
● Heat treatment and microstructure specifications:
● Delivery status: hot-rolled or cold-drawn delivery, the delivery status should be specified in the contract.