| Hot Work Steel | Shock-Resisting Steel | Cold Work Steel |
| Mold Steel | Oil-Hardening Steel | Air-Hardening Steel |
| 3D Systems Corporation | Assab Steels | ATI Allegheny Ludlum |
| ATI Allvac | Bohler-Uddeholm | Crucible Steel |
| EDRO | Latrobe Steel | MetalTek |
| Misumi | PSM Industries | Schmolz + Bickenbach (Swiss Steel International) |