● Chemical Composition:
Carbon C: 0.10 ~ 0.18
Si Si: ≤ 0.15
Manganese Mn: 0.80 ~ 1.20
Sulfur S: 0.23 ~ 0.33
Phosphorus P: 0.05 ~ 0.10
Lead Pb: 0.15 ~ 0.35
● Mechanical Properties:
Tensile strength σb (MPa): (hot) 390 - 540; (cold drawn) steel thickness or diameter of 8 to 20 hours: 530 ~ 755;> 20 to 30 hours: 510 ~ 735;> 30 hours: 490 ~ 685
Elongation δ5 (%):( hot) ≥ 22; (cold) ≥ 7.0
Reduction of ψ (%):( hot) ≥ 36
Hardness: (hot) ≤ 170HB; (cold-drawn steel) 152 ~ 217HB
● Heat treatment and microstructure specifications:
● Delivery status: the hot-rolled or cold-drawn state of delivery, delivery status should be indicated in the contract.
