S7 Tool Steel Technical Data

Carbon: .45 / .55

Manganese: .20 / .80

Silicon: .20 / 1.00

Tungsten:

Molybdenum: 1.30 / 1.80

Chromium: 3.00 / 3.50

Vanadium: .30 max.

Cobalt: --

Forging:  
Start forging at: 1800-1950°F (982-1066°C) Do not forge below: 1550°F (843°C)
Normalizing:  
1600°F (871°C)
Annealing:
Temperature: 1400-1450°F (760-788°C) Rate of cooling, max. per hour: 40°F (22°C) Typical annealed hardness, Brinell: 183-212
Hardening:
Rate of heating: Slowly Preheat temperature: 1200°F (649°C) Hardening temperature: 1450-1500°F (788-816°C) Time at temperature, minutes: 10-30 Quenching medium: O 
Tempering:
Tempering temperature 350-500°F (177-260°C) Approx. tempered hardness, Rockwell C: 57-62
Wear Resistance: Medium Toughness: Medium Resistance to Softening Effect of Elevated Temperature: Low Depth of Hardening: Medium Machinability: High Grindability: High Distortion in Heat Treating: Low Safety in Hardening: Medium to High Resistance to Decarburization: High