the detroit plant was a finishing facility for sheet and strip products only. principal operating units were two ., 4-high cold reduction mills, a cold anneal and pickle line, a temper mill, two slitting lines(36in. and 24in.), and a coil polisher. the two 50in. reduction mills were essentially identical. both were installed in 1953 by united and combined, they both had an annual capacity of 120,000 tons. the cold anneal and pickle line were installed in 1975 by production machinery. the line consisted of an entry end washing section to remove rolling oils, an open air annealing furnace (where the strip was heated above ), and three acid pickling tanks followed by rinsing and drying units. paper was interleaved between the coil wraps at the exit take up reel to avoid surface abrasion.