Implementation of the standards: GB / T 8731-1988
Y12Pb cutting steel:
● Chemical Composition:
Carbon C: 0.08 ~ 0.16
Si Si: ≤0.15
Mn Mn: 0.70 ~ 1.10
Sulfur S: 0.15 ~ 0.25
P P: 0.05 ~ 0.10
Lead Pb: 0.15 ~ 0.35
● Mechanical Properties:
Tensile strength σb (MPa) :( hot) 390 to 540; (cold drawn) steel thickness or diameter of 8 to 20 o'clock: 530 to 755;> 20 to 30: 510 - 735;> 30: 490 - 685
Elongation δ5 (%) :( hot rolled) ≥22; (rolled) ≥7.0
Reduction of area ψ (%) :( hot rolled) ≥36
Hardness :( hot) ≤170HB; (cold drawing) 152 ~ 217HB
● Heat treatment and microstructure specifications:
● Delivery status: hot-rolled or cold-drawn delivery, the delivery status should be specified in the contract. | 
