S-7 Shock Resisting Tool Steel
S-7 is an air or oil hardening tool steel that is characterized by very high impact toughness. The combination of strength and high toughness makes S-7 tool steel a candidate for a wide variety of tooling applications. S-7 tool steel can be used successfully for both cold and hot work applications.Analysis:
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C
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CO
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CR
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MN
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MO
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NI
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P
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S
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SI
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V
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W
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| 0.45 - 0.55 | | 3.00 - 3.50 | 0.20 - 0.90 | 1.30 - 1.80 | | | | 0.20 - 1.00 | 0.35 Max. | |
Size Availability:
Flats • Hollowbar • Metric • Non-Standard • Rounds • Squares • StandardApplications:
| Blanking Dies | Brake Dies | Chisels |
| Die Casting Dies - Zinc | Forming Dies | Gripper Dies |
| Header Dies | Heading Dies - Hot | Master Hobs |
| Plastic Mold Dies | Punches | Rivet Sets |
| Shear Blades | | |
Designations:
AISI S7 Tool Steel - US
ASTM A681 - US
UNS T41907 - US
| 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 category.
Applications and technical information require engineers and tool designers to exercise independent judgement.
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