Koninklijke Hoogovens known as Koninklijke Nederlandse Hoogovens en Staalfabrieken (KNHS) until 1996 or informally Hoogovens. is a Dutch steel producer founded in 1918. Since 2010, the plant has been known as Tata Steel IJmuiden.
The steelworks is based in IJmuiden, the Netherlands. It was built between 1920 and 1940, first producing iron, later steel, with hot and cold rolling producing flat products. In the 1960s the company diversified into aluminium production.
The company merged its IJmuiden steel plant with German steel company Hoesch from 1972 forming the joint venture Estel and separated in 1982. In 1999, the company merged with the larger British Steel plc to create the Corus Group steel company. The aluminium production assets were sold off during the Corus period.