ThyssenKrupp
Tenaris
Pohang Iron & Steel (POSCO)
Baosteel
CENTRAVIS
Tubacex
ArcelorMittal
Nippon Steel & Sumitomo Metal (NSSMC)
Outokumpu
Tianjin Pipe (Group) Corporation
Zhejiang JIULI Hi-tech Metals
TISCO
Sandvik
Tata Steel
Butting
Tsingshan
JFE
AK Steel
Jiuli Group
Wujin Stainless Steel Pipe Group
Mannesmann Stainless Tubes