Tool Steel
S7
The shock-resisting grade: high toughness and impact resistance with good hardness. For tools that take a beating — chisels, punches, and die inserts.
Last verified: 2026-07-10
| AISI classTool-steel group (hardening method / application). | S — shock-resisting |
|---|---|
| Carbon(%C)Nominal carbon content. | 0.5 |
| Key alloyingPrincipal alloying elements (nominal). | Cr, Mo |
| Working hardness(HRC)Typical hardened + tempered working range. | 54–58 |
| Wear resistance | Moderate |
| Toughness | Excellent |
| Typical uses | Chisels, punches, shear blades, die-casting inserts, impact tools |
- Typical uses: cold chisels, punches, shear blades, riveting and impact tools, die-casting inserts.
- Exceptional toughness and impact resistance; air-hardening with good size stability.
- Moderate wear resistance — trade for its ability to survive shock loads.
Other tool steels
Sources
- AISI tool-steel classification (type letters and nominal compositions)
- ASM International — Tool Steels / Heat Treater's Guide (typical properties and working hardness)