- POHANG IRON & STEEL CO., LTD.(POSCO)
- POSCO ENGINEERING & CONSTRUCTION CO.,LTD.(POSCO E&C)
- POSCO PLANTEC CO.,LTD.(POSMEC)
- SEAH CSS CORP.
- SEAH BESTEEL CO.,LTD.
- HYUNDAI STEEL COMPANY
- DONGKUK STEEL MILL CO.,LTD.
- DONGBU STEEL
- POONGSAN CORPORATION(POONGSAN)
- DONGIL INDUSTRIES CO., LTD.