Details:

● Chemical Composition:

      Carbon C: 0.37 ~ 0.45 (promise deviation: ± 0.01)

      Si Si: ≤ 0.20

      Manganese Mn: 0.30 ~ 0.60 (promise deviation: ± 0.02)

      Sulfur S: ≤ 0.035

      Phosphorus P: ≤ 0.035
      Chromium Cr: promised to the residual content of ≤ 0.020

      Ni: to promise the residual content of ≤ 0.020

      Copper Cu: agreed to the residual content of ≤ 0.020
● Mechanical Properties: Tensile strength σb (MPa): ≥ 569 (58) yield strength σs (MPa): ≥ 333 (34) Elongation δ5 (%): ≥ 19 Reduction of area ψ (%): ≥ 45 Hardness : (hot) ≤ 217HB, indentation diameter ≥ 4.1mm; (annealing) ≤ 187HB, indentation diameter ≥ 4.4mm
● Heat treatment and microstructure specifications: standard heat treatment: heating to the critical point than the AC3 30 ~ 50 ℃ high temperature, holding time less than 30min, air-cooled.
● Delivery status: in Hot state of delivery. The agreement can also be delivered by the annealed condition.