Dongkuk Steel Mill Co, Ltd. (Korean: 동국제강 주식회사; Hanja: 東國製鋼 株式會社; RR: Dongguk Jegang Jusik Hoesa) is a steel company with its headquarters in the city of Seoul, South Korea.

Founded on 7 July 1951, its manufacturing plants are located in Pohang, Incheon, Dangjin, and Busan.

[2] Dongkuk Steel is the parent company of the Dongkuk Steel Group with several subsidiaries, including Union Steel.

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