S-7 Air Hardening tool Steel
Flats - Rounds - Squares - Hollowbar
Standard Sizes - Non-Standard Sizes - Metric Sizes
TREATMENT |
TEMPERATURE RANGE |
COOLING/QUENCHING |
NOTES |
FORGING |
1900-2050° F |
Slow. |
Cool slowly in furnace or in other insulating media. |
ANNEALING |
1500-1600° F |
Cool slowly at a rate of 25° F per hour to 1000° F. |
Hold at temperature for 2 hours. |
STRESS RELIEVING |
1000-1200° F |
Cool slowly |
Stress relieve after rough machining |
PREHEATING |
1200-1250° F |
|
Preheat time in furnace is ¾ Hr. per inch of thickness. Heating up to temperature as slow as possible. |
HARDENING |
1700-1750° F |
In air. Larger sections may require oil quenching. |
Soak time is 30 minutes per inch of thickness. Minimum of 1 hour. Allow to cool to 125-150° F before tempering. |
TEMPERING |
(See Chart) |
|
Complete equalization of temperature throughout the tool is essential for good results. Double temper. Recommended temperature is 400-1000° F. |
Data is typical and should not be construed as actual values for any catagory.
Applications and technical information require engineers and tool designers to exercise independent judgement.