Wrought Iron Pipe Manufacturers
| North Star Bluescope Steel (Delta, OH) |
| Northeast Auto Recyclers Inc (Conneaut, OH) |
| Northern Casting Co (Kingston, NY) |
| Northern Industries Inc (Crestwood, IL) |
| Northern Kentucky Mgmt Inc (Newport, KY) |
| Northland Process Piping (Lemoore, CA) |
| Northwest Management Group Inc (East Chicago, IN) |
| Northwest Ohio Recycling (Pandora, OH) |
| Northwest Pipe Co (Denver, CO)
Manufacturer |
| Northwest Pipe Company (Portland, OR) |
| Northwest Steel Corp (Franklin Park, IL) |
| Ns Group Inc (Newport, KY) |
| Nu Steel Co (Chicago, IL) |
| Nucor Cold Finish (Darlington, SC) |
| Nucor Corp (Charlotte, NC) |
| Nucor Steel (Birmingham, AL) |
| Nucor Steel Auburn Inc (Auburn, NY) |
| Nucor Steel Construction (Charleston, SC) |
| Nucor Steel Jackson Inc (Flowood, MS) |
| Nucor Steel Kankakee Inc (Bourbonnais, IL) |
| Nucor Steel Marion Inc (Marion, OH) |
| Nucor Steel Seattle Inc (Seattle, WA) |
| Nucor Steel Tuscaloosa Inc (Tuscaloosa, AL) |
| Nucor Steel-Berkeley (Huger, SC) |
| Nucor-Yamato Steel (Paragould, AR) |
