ArcelorMittal S.A. Hydraulic & Engineering Components Private Limited
Indian Oil Corporation Limited
JFE Steel Corporation
Nippon Steel Corporation
PAO Chelpipe
PAO Severstal
PAO TMK
Piping Technology & Products Inc. SSAB AB
Sumitomo Metal Industries
Ltd. Tenaris S.A. United States Steel Corporation
Vallourec S.A. Zhejiang Jiuli Hi-Tech Metals Co. Ltd