| Stainless Steel | Alloy Steel | Carbon Steel |
| Tool Steel | Duplex | Pressure Vessel Steel |
| Cast Iron | Maraging Steel | Chrome-moly Steel |
| Special-Purpose Steel |
| 3M | Alliance LLC | Bohler-Uddeholm |
| Carpenter Technology Corporation (Cartech) | EDRO | Goodfellow |
| Hardwire, LLC | Meehanite | Plansee SE |
| Pyrotek, Inc. | ThyssenKrupp | Universal Wire Works |