| Medium Carbon Steel | AISI 1000 Series Steel | Low Carbon Steel |
| High Carbon Steel |
| AK Steel | Carpenter Technology Corporation (Cartech) | Crucible Steel |
| EDRO | Groupe Arcelor | Latrobe Steel |
| Niagara LaSalle | Pacific Sintered Materials | PSM Industries |
| SSAB Tunnplat AB | Wingate Alloys |