ALZ (Allegheny-Longdoz) is a stainless steel producer based in Genk in Limburg province, Flanders, Belgium.
ALZ was founded as a vertically integrated stainless steel producer in 1960 as an equal holding between Espérance-Longdoz (Belgium) (controlled by Evence Coppée) and Allegheny Ludlum (USA).
[4] In 2001 Arbed became part of Arcelor and ALZ merged with French stainless producer Société d’électrochimie, d'électrométallurgie et des aciéries électriques d'Ugine (in French), former producer of the Zyklon B in France during World War II, to become Ugine & ALZ (U&A).
Cast stainless blocks were produced at the factory and sent to the Espérance-Longdoz plant in Chertal, Liege for conversion to slab, they then returned to ALZ for rolling.
The factory site of 78.5 ha (0.785 km2) is connected to the rail network, and is situated on the north bank of the Albert Canal from which it draws cooling water.