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.
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.
| C | CO | CR | MN | MO | NI | P | S | SI | V | W |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.45 – 0.55 | 3.00 – 3.50 | 0.20 – 0.90 | 1.30 – 1.80 | 0.20 – 1.00 | 0.35 Max. |
Flats • Hollowbar • Metric • Non-Standard • Rounds • Squares • Standard
| 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 |
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. |