Steel Alloy

● chemical composition:c: 0.12 ~ 0.18, si: 0.17 ~ 0.37 , mn: 0.40 ~ 0.70, s: ≤ 0.035, p: ≤ 0.035cr: 0.80 ~ 1.10 , ni: ≤ 0.030, cu: ≤ 0.030, mo: 0.40 ~ 0.55● mechanical properties:tensile strength σb (mpa): ≥ 440 (45)yield strength σs (mpa): ≥ 295 (30)elongation δ5 (%): ≥ 22reduction of area ψ (%): ≥ 60impact energy akv (j): ≥ 94impact toughness αkv (j/cm2): ≥ 118 (12)hardness: ≤ 179hbsample size: 30mmheat treatment specification: quenching 900 ℃, air cooling; tempering 650 ℃, air cooling.delivery status: heat treatment (normalizing, annealing, or tempering) or non- heat treatment delivery, the delivery status should be specified in the contract.