Material: carbon tool steel 
 Grade: T8A 
 Standard: GB / T 1301-1994 
 ● Features and Scope: 
 Higher hardness and wear resistance after quenching and tempering, but rigidly low thermal hardenability and easy to deformation, low ductility and strength. As a need to have high hardness and wear resistance of a variety of tools, such as simple shape of the mold and the punch, cutting metal cutting tools, drilling tools, woodworking cutter, cutters, axes, chisels, vertical hand saws , the fitter assembly tools, rivet die secondary tool. 
 ● chemical composition: 
 Carbon C: 0.75 ~ 0.84 
 Silicon Si: ≤ 0.35 
 Mn Mn: ≤ 0.40 
 Sulfur S: ≤ 0.020 
 Phosphorus P: ≤ 0.030 
 Chromium Cr: allow the residual content of ≤ 0.25, ≤ 0.10 (manufacturing lead bath quench wire) 
 Ni: to allow the residual content of ≤ 0.20 ≤ 0.12 (manufacturing lead bath quench wire) 
 Cu: to allow the residual content of ≤ 0.30, ≤ 0.20 (manufacturing lead bath quench wire) 
 Note: to allow the residual content of Cr + Ni + Cu ≤ 0.40 (manufacturing lead bath quench wire) 
 ● Mechanical Properties: 
 Hardness: Annealed ≤ 187HB, indentation diameter ≥ 4.40mm; quenching, ≥ 62HRC 
 ● Heat treatment and microstructure: 
 Heat treatment specifications: sample quenched to 780 ~ 820 ° C, water-cooled. 
 ● Delivery status: delivery of steel in annealed condition. By mutual agreement, may not annealed state delivery 

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