190 Bissell Pl. • Unit A • San Jacinto, CA 92592 • Phone (951) 654-5660 • FAX (951) 654-4070
S7 Heat Treating Instructions

Here is a general guide to heat treating S7 tool steel.

Hardening
Heat material to 1725/1750F (orange color) and air quench. Typically in our shop we use a fan to move air across the material to quench the steel. S7 may also be oil quenched to attain the material’s full hardness.

Temper
S7 tempers above 350F (straw color). Heat and air cool to room temperature.

Typical Properties

Tempering Temperature (ºF) Hardness (HRC)
300°
400°
500°
600°
700°
800°
900°
1000°
1100°
1200°

59
57
55
54
53
53
52
51
47
41

 

Adapted from Crucible Tool Steel Steel and Specialty Alloy Selector