| 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 | Crucible Steel | Groupe Arcelor |
| Latrobe Steel | MetalTek | Misumi |
| PSM Industries | Schmolz + Bickenbach (Swiss Steel International) | Wingate Alloys |