| 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 | American Elements | ATI Allegheny Ludlum |
| Crucible Compaction Metals | Crucible Steel | International Mold Steel |
| Meehanite | Outokumpu | Pyrotek, Inc. |
| The NanoSteel® Company | ThyssenKrupp |