Wrought Iron Pipe Manufacturers
| IPSCO (Roscoe, PA) |
| Ispat Inland Inc (Chicago, IL) |
| Jackson Tube Svc Inc (Piqua, OH)
Manufacturer |
| Kalamazoo Steel Processing Inc (Kalamazoo, MI) |
| Kane Steel Co (Pottsville, PA) |
| Kenwal Steel Corp (Dearborn, MI) |
| Keywell LLC (Chicago, IL) |
| Koppers Industries Inc (Pittsburgh, PA) |
| Lee Industries Inc (Philipsburg, PA) |
| Lippert Components Inc (Naples, FL) |
| Loveman Steel Corp (Bedford Heights, OH) |
| LTV Corp (Warren, OH) |
| LTV Steel Co (East Chicago, IN) |
| MACSTEEL (Jackson, MI) |
| Main Steel Polishing Co Inc (Bartlett, IL) |
| Marmon/Keystone (Temperance, MI) |
| Merit Brass Co (Richmond Hts, OH) |
| Metaldyne Sintered Components (Saint Marys, PA) |
| Metals USA (Germantown, WI) |
| Mill Steel Co (Grand Rapids, MI) |
| MISA - Global Metal Solutions (West Chester, OH)
Contract Manufacturer, Service Company |
| Mi-Tech Steel Inc (Greensburg, IN) |
| MSI Corp (Vandergrift, PA) |
| Namasco Corp (Suwanee, GA) |
| National Processing Co/Plt 2 (East Chicago, IN) |
