Tenaris
Vallourec
TMK Group
Nippon Steel and Sumitomo Metal
U. S. Steel Tubular Products
ArcelorMittal
SANDVIK
Zekelman Industries
SB international Inc
Continental Alloys and Services
Baoshan Iron and Steel Co.Ltd.
Jiangsu Changbao Steel tube Co.Ltd.
Hunan Valin Hengyang Steel Tube(Group)Co.Ltd.
Tian Jin Pipe (group) Corporation(TPCO)
JFE
Interpipe
Voestalpine
Evraz
JESCO
Jindal Saw
Maharashtra
SeAH Steel
Nexteel
Hyundai Hysco