BÖHLER K340 ISODUR belongs to the group of 8% chromium steels. This tool steel is produced using the electro-slag remelting (ESR) process developed by BÖHLER. This re-melting technology ensures the lowest micro and macro segregation as well as excellent purity and uniformity of the material. Compared to conventional 12% chromium steels, BÖHLER K340 ISODUR offers significantly better toughness, hardening response and higher resistance to adhesive wear. This material is therefore used in virtually all cold work applications in situations where tool steels like 1.2379 are insufficient in terms of adhesive wear resistance and toughness. K340 ISODUR also features better machinability and reduces the risk of stress cracking during electrical discharge machining.
| Compressive strength | Dimensional Stability in heat treatment | Toughness | Wear resistance abrasive | Wear resistance adhesive |
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| C | Si | Mn | Cr | Mo | V | Al | Nb | |
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| 1.10 | 0.90 | 0.40 | 8.30 | 2.10 | 0.50 | + | + |
