| 1 | Structural Pipe of Oklahoma Inc. | | USA |
| 2 | Dean Lally L.P. | | USA |
| 3 | Valiant Steel | | USA |
| 4 | Stainless Specialties Inc. | | USA |
| 5 | Williams Metals & Welding Alloys Inc. | | USA |
| 6 | AZCO Steel Company A Division of Bushwick Metals LLC | | USA |
| 7 | Atlas Tube Inc. | | USA |
| 8 | Bushwick Metals LLC | | USA |
| 9 | Stainless Shapes Inc. | | USA |
| 10 | Yarde Metals Inc. | | USA |
| 11 | Maruichi Leavitt Pipe & Tube LLC | | USA |
| 12 | Wisconsin Steel & Tube Corporation | | USA |
| 13 | United Pipe Nipple Company | | USA |
| 14 | Nivert Metal Supply Inc. | | USA |
| 15 | TPCO Enterprise Inc. | | USA |
| 16 | Berg Steel Pipe Corp. | | USA |
| 17 | Bendmaster’s Inc. | | USA |
| 18 | The Hart Companies | | USA |
| 19 | Searing Industries | | USA |
| 20 | Piping Technology & Products Inc. | | USA |
| 21 | American Steel Pipe Div. American Cast Iron Pipe Co. | | USA |
| 22 | American Spiralweld Pipe Co. LLC | | USA |
| 23 | Conley Corp. | | USA |
| 24 | Technical Machine Sales Inc. | | USA |
| 25 | L.B. Foster Co. | | USA |
| 26 | Superior Elbow Co. Inc. | | USA |
| 27 | Accord Pipe Fabricators Co. Inc. | | USA |
| 28 | The Hollaender Mfg. Co. | | USA |
| 29 | A-1 Alloys | | USA |
| 30 | Ensinger Penn Fibre Inc. | | USA |
| 31 | Naylor Pipe Co. | | USA |
| 32 | Chicago Metal Rolled Products Co. | | USA |
| 33 | Reliable Source Inc. | | USA |
| 34 | Precision Welding & Fabrication | | USA |
| 35 | Mega Steel & Tube | | USA |
| 36 | Denier James Co. | | USA |
| 37 | Manly Steel | | USA |
| 38 | Omni Steel Supply | | USA |
| 39 | DD Wire | | USA |
| 40 | Southeast Texas Industries Inc. | | USA |
| 41 | Gerdau | | USA |
| 42 | Titanium Fabrication Corp. Phoenix Group | | USA |
| 43 | Arntzen Pipe | | USA |
| 44 | Stainless Structurals LLC | | USA |
| 45 | Kottler Metal Products Inc. | | USA |
| 46 | Steel Forgings Inc. | | USA |
| 47 | U.S. Steel Corp. | | USA |
| 48 | Industrial Plastic Products Inc. | | USA |
| 49 | Scion Steel | | USA |
| 50 | Albina Co. Inc. | | USA |
| 51 | MRC Global | | USA |
| 52 | U.S. Industrial Piping Inc. | | USA |
