Chemical composition of alloy tool steel
Carbon C: 0.85 ~ 0.95
Si Si: 1.20 ~ 1.60
Manganese Mn: 0.30 ~ 0.60
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.030
Chromium Cr: 0.95 ~ 1.25
Ni: to allow the residual content of ≤ 0.25
Copper Cu: to allow the residual content of ≤ 0.30
Mechanical properties of alloy tool steel
Hardness: Annealed, 241 ~ 197HB, indentation diameter of 3.9 ~ 4.3mm; 187 ~ 229HB (manufacturing thread tools); quenching, ≥ 62HRC
9SiCr alloy tool steel heat treatment and microstructure specifications:
Heat treatment specifications: sample quenching 820 ~ 860 ℃, oil cooling.