PT Gunawan Dianjaya Steel Tbk (GDST) was founded on April 8 1989 in Surabaya. The company's main business activity is the hot rolled steel plate milling industry, on a 20 hectare factory site located in Surabaya. The company produces steel plates for general use, steel plates for boilers and pressure vessels, as well as steel plates for shipbuilding. The products are distributed to domestic and export markets.