Cold rolled steel coil: using hot rolled steel coil as raw material, after pickling to remove the oxide scale for cold tandem rolling, the finished product is rolled hard coil, because of the continuous cold deformation caused by cold hardening of the rolled hard coil strength, hardness, toughness and plastic index decreased, so the stamping performance will deteriorate, can only be used for simple deformation of the parts.
Hard coils can be used as raw materials for hot dip galvanizing plants, because hot dip galvanizing units are equipped with annealing lines.Rolling hard coil weight is generally 6~13.5 tons, steel coil at room temperature, hot rolled pickling coil for continuous rolling.The inner diameter is 610mm.