Material Name
Carbon tool steel
Grade: T8A
Standard: GB / T 1298-1986
● Features and Scope
After quenching and tempering high hardness and wear resistance, but low thermal rigid, hardenability is poor, deformation, ductility and lower strength. As a need to have a high hardness and wear resistance of tools, such as the shape of a simple mold and punch, metal cutting tools, drilling tools, woodworking cutters, hard drilling, axes, chisels, hand saws vertical , and the fitter assembly tools, dies and other secondary rivet tool.
● Chemical Composition
Carbon C: 0.75 ~ 0.84
Si Si: ≤ 0.35
Manganese Mn: ≤ 0.40
Sulfur S: ≤ 0.020
Phosphorus P: ≤ 0.030
Chromium Cr: allow the residual content of ≤ 0.25, ≤ 0.10 (when manufacturing lead bath quench wire)
Ni: to allow the residual content of ≤ 0.20, ≤ 0.12 (when manufacturing lead bath quench wire)
Copper Cu: to allow the residual content of ≤ 0.30, ≤ 0.20 (when manufacturing lead bath quench wire)
Note: The allows the residual content of Cr + Ni + Cu ≤ 0.40 (when manufacturing lead bath quench wire)
● Mechanical Properties
Hardness: Annealed, ≤ 187HB, indentation diameter ≥ 4.40mm; quenching, ≥ 62HRC
