| Medium Carbon Steel | AISI 1000 Series Steel | Low Carbon Steel |
| High Carbon Steel |
| ATI Allegheny Ludlum | Bisalloy Steels | Crucible Steel |
| Groupe Arcelor | Latrobe Steel | Osprey Metals, Ltd. |
| Pacific Sintered Materials | SSAB Tunnplat AB | ThyssenKrupp |
| Universal Wire Works | Wingate Alloys |