Steel Pipe Manufacturers
| Carbide Technologies Inc (Fraser, MI) |
| Cargill Inc (East Chicago, IN) |
| Carlson, G O Inc (Thorndale, PA) |
| Carpenter Technology Corp (Reading, PA) |
| Chatham Steel Corp (Savannah, GA) |
| Cincinnati Steel Products Co (Cincinnati, OH) |
| CONTECH Construction Products (Greencastle, PA) |
| Cooper Standard Automotive (Auburn Hills, MI) |
| Crucible Research (Pittsburgh, PA) |
| Delta Tube & Fabrication (Holly, MI) |
| Dietrich Industries Inc (Hammond, IN) |
| EMJ Co (Twinsburg, OH) |
| Energy Transfer Inc (Canfield, OH) |
| Fansteel American Sintered (Emporium, PA) |
| Federal-Mogul Corp (Logansport, IN) |
| Feralloy Corp (Chicago, IL) |
| Frederick Steel Co (Cincinnati, OH) |
| Fry Technologies (Altoona, PA) |
| Grant, Louis A Inc (Export, PA) |
| Harsco Corp (Camp Hill, PA) |
| Hawk Corp (Cleveland, OH) |
| Heckett MultiServ (Coatesville, PA) |
| High Performance Tube Inc (Brunswick, GA)
Manufacturer |
| Indiana Tube Corp (Evansville, IN) |
| IPSCO (Roscoe, PA) |
