PT Gunawan Dianjaya Steel Tbk produces and sells hot rolled steel plates in Indonesia. The company offers steel plates for general use, such as low carbon structural steel plates and high strength low alloy structural steel plates; steel plates for boilers and pressure vessels; and steel plates for ship building, including mild steels and high tensile steels. It also exports its products. The company was founded in 1989 and is headquartered in Surabaya, Indonesia.