| Hot Work Steel | Shock-Resisting Steel | Cold Work Steel |
| Mold Steel | Oil-Hardening Steel | Air-Hardening Steel |
| Assab Steels | ATI Allegheny Ludlum | ATI Allvac |
| Carpenter Technology Corporation (Cartech) | EDRO | Groupe Arcelor |
| International Mold Steel | Latrobe Steel | MetalTek |
| Misumi | Osprey Metals, Ltd. | PSM Industries |