| Hot Work Steel | Shock-Resisting Steel | Cold Work Steel |
| Mold Steel | Oil-Hardening Steel | Air-Hardening Steel |
| Assab Steels | ATI Allegheny Ludlum | ATI Allvac |
| Bohler-Uddeholm | Crucible Compaction Metals | Crucible Steel |
| EDRO | International Mold Steel | Misumi |
| Osprey Metals, Ltd. | PSM Industries | Wingate Alloys |