Grade: T8 Standard: GB / T 1298-1986 ● Features and Scope: after quenching and tempering has high hardness and wear resistance, but low thermal rigid, poor hardenability, deformation, plasticity and low strength. As a need to have a high hardness and wear resistance of a variety of tools, such as a simple mold and shape punch, metal cutting tools, drilling tools, woodworking cutters, cutters, axes, chisels, hand saws vertical and fitter assembly tools, dies and other minor rivet tool. ● Chemical Composition: Carbon C: 0.75 ~ 0.84 Si Si: ≤ 0.35 Manganese Mn: ≤ 0.40 Sulfur S: ≤ 0.030 Phosphorus P: ≤ 0.035 Chromium Cr: to allow the residual content of ≤ 0.25, ≤ 0.10 (manufacture of lead wire quenching bath) Nickel Ni: to allow the residual content of ≤ 0.20, ≤ 0.12 (manufacture of lead wire quenching bath) Cu: to allow the residual content of ≤ 0.30, ≤ 0.20 (manufacture of lead wire quenching bath) Note: to allow the residual content of Cr + Ni + Cu ≤ 0.40 ( manufacture of lead wire quenching bath) ● Mechanical Properties: Hardness: annealing, ≤ 187HB, indentation diameter ≥ 4.40mm; quenching, ≥ 62HRC ● Heat treatment and microstructure specifications: Heat treatment specifications: Sample quenching 780 ~ 800 ℃, water-cooled. ● Delivery status: Delivery of steel in the annealed condition. By mutual agreement, it can not annealed delivery