1. Acciai Speciali Terni S.P.A. by Arvedi Group
2. Divine Tubes Pvt. Ltd.
3. Eisenbau Kr?mer GmBH
4. Halcor
5. Heavy Metals & Tubes Ltd.
6. Hutmen S.A.
7. Jindal Saw Ltd.
8. Kme Germany Gmbh & Co Kg
9. Macsteel
10. Nippon Steel & Sumitomo Metal Corporation
11. Ratnamani Metal & Tubes Ltd.
12. Sandvik AB
13. SSP Corporation
14. Tata Steel
15. Tenaris
16. TMK
17. Wieland