The famous German industrial architect built this melt shop in 1957 for Phoenix Rheinrohr in Duisburg, one of the largest German steel companies of that time. It was equipped with three Thomas converters and one modern oxygen converter.
The building underwent several changes over the years especially when it was transformed into a BOF shop in 1969.
Nowadays the ArcelorMittal Ruhrort plant runs a steel making shop with two 140 ton BOF vessels (and one in reserve), two continuous casters and a two stand billet mill. Hot metal comes from the ThyssenKrupp steel company in Duisburg via bottle cars.
Further images on my site.