| Stainless Steel | Alloy Steel | Carbon Steel |
| Tool Steel | Duplex | Pressure Vessel Steel |
| Cast Iron | Maraging Steel | Chrome-moly Steel |
| Special-Purpose Steel |
| 3D Systems Corporation | Bohler-Uddeholm | Dura-Bar |
| FloMet LLC | Latrobe Steel | Less Common Metals |
| Meehanite | MetalTek | Outokumpu |
| P & P Technology | Pyrotek, Inc. | Resistalloy International Limited |