| Company | Country |
| A.D. Tubi Inossidabili | USA |
| Acciai Vender spa | Italy |
| Acute Technological Services Inc | USA |
| ANTONIUS Vesselheads bv | Netherlands, The |
| Arc Machines Inc | USA |
| ATI | USA |
| Bodycote - Kolsterising | USA |
| Böhler Thyssen Welding USA Inc | USA |
| Bruker AXS | USA |
| Buhlmann Rohr-Fittings Stahlhandel GmbH + Co KG | Germany |
| Canadoil Group | Thailand |
| Centravis | Ukraine |
| DJF Co Ltd | South Korea |
| DMC Clad Metal Div - Dynamic Materials Corp | USA |
| Electralloy | USA |
| Erndtebrücker Eisenwerk GmbH & Co KG | Germany |
| ESAB Welding & Cutting | USA |
| Greenmount Corporation / Tsingshan Holding Group | USA |
| Hailong (Zhangjiagang) Industry Co Ltd | China |
| HC Starck Inc | USA |
| Heavy Metal & Tubes Ltd | India |
| Hebei Cangzhou Tiangong Stainless Products Co, Ltd | China |
| IMEAS Inc | USA |
| Industeel USA LLC(ArcelorMittal Group) | USA |
| Innov-X Systems Inc | USA |
| J & J Mfg Inc | USA |
| Jacquet Mid Atlantic | USA |
| Jiangsu Wujin Stainless Steel Pipe Group Co., Ltd. | China |
| KCI | Netherlands, The |
| Kobalt Partners LLC | USA |
| Kobelco Welding of America Inc | USA |
| Kube Stahl GmbH & Co KG | Germany |
| Nippon Yakin Kogyo Co Ltd | Japan |
| Noxon Stainless bv | Netherlands, The |
| Outokumpu | USA |
| PA Inc | USA |
| Plymouth Tube Company | USA |
| PNP Special Alloys Inc. | USA |
| Poligrat GmbH | Germany |
| Prakash Steelage Ltd | India |
| RathGibson | USA |
| Ratnadeep Metal & Tubes Ltd., | India |
| Ratnamani Metals & Tubes Ltd | India |
| Rolled Alloys Inc | USA |
| Salzgitter Mannesmann Stainless Tubes | USA |
| Samuel Son & Co Inc | USA |
| Sandmeyer Steel Company | USA |
| Sandvik Materials Technology | USA |
| Schulz U.S.A | USA |
| Shanghai Want Industry Co Ltd | China |
| Siderval SpA | Italy |
| Special Metals Welding Products | USA |
| Special Piping Materials INC | USA |
| Special Quality Alloys Inc | USA |
| Spectro Analytical Instruments | USA |
| Stainless Structurals LLC | USA |
| Starfit China Ltd | Hong Kong |
| Sumitomo Metal Industries Ltd | Japan |
| Sunrise Group | India |
| Tantaline Inc. | USA |
| Thermo Scientific Niton Analyzers | USA |
| Timesavers International B.V. | Netherlands, The |
| Tubacex America, Inc. | USA |
| Webco Industries Inc | USA |
| Weir Materials & Foundries | United Kingdom |
| Xian Raina Industry Co Ltd | China |
| Zhangjiagang Huayu Nonferrous Metal Material Co., Ltd | China |
| Zhangjiagang Titan Impt & Expt Co. ltd | China |
| Zhejiang Jiaxing Zhongda Group Co Ltd | China |
| Zhejiang Jiuli Hi-Tech Metals Co Ltd | China |
| Zhejiang Lixue Steel Pipe Co., Ltd. | China |