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S7 is a shock-resistant air hardening tool steel, designed for high impact resistance at relatively high hardness. It offers toughness to withstand chipping and breaking, combined with high attainable hardness and good wear resistance.
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| Â | C. | Si. | Mn. | Cr. | Mo. |
| Min.% | 0.5% | 0.20 | 0.20 | 3.25% | 1.40% |
| Max.% | Â | 0.40 | 0.40 | Â |