Element

Percentage

Carbon (C)

0.80-0.90

Silicon (Si)

Max 0.45

Manganese (Mn)

Max 0.40

Chromium (Cr)

3.80-4.30

Tungsten (W)

17.00-18.50

Vanadium (V)

0.60-1.20

Cobalt (Co)

8.00-10.00

Nickel (Ni)

Max 0.50

Iron (Fe)

Bal.

Heat Treatment Process

Temperature Range (°C)

Preheating

500-900

Annealing

850-900 (Slow cooling in furnace)

Stress Relieving

600-650 (Slow cooling in furnace)

Hardening

1190-1230 (Oil, Air, Warm bath 500-550°C quenching)

Tempering

550-600 (Air cooling)