Continuous processing line - for cold-rolled deep-drawing strip

摘要

Low-carbon deep-drawing strip is continuously processed in a line consisting of: de-coiler, cleaner, furnace, looper, skin pass mill, leveller, and tension coiler. The furnace has a heating zone to bring the strip up to 700-900 degrees C in 2 min., a soaking zone (2 min.), a primary cooler to bring the temperature down at 5-30 degrees/sec. to 250-450 degrees C, another soaking zone (5-10 min.), and a secondary cooler to bring the strip to less than 15 degrees C in 2 min. The skin pass mill has a rapid roll change mechanism and, being separate from the leveller, can be smaller. To avoid undue stresses in the strip, the radius of bending/heating rolls should be 600-800 x strip thickness.