[China Aluminum Industry Net] Cold Rolling: Using hot-rolled steel coils as raw materials, after removing oxide scales after pickling, tandem cold rolling is performed. The finished products are rolled hard coils. The cold work hardening due to continuous cold deformation makes the hard coils rolled. As the strength, hardness, and toughness index decrease, the stamping performance will deteriorate, and it can only be used for simple deformed parts. Rolled hard coils can be used as raw materials for hot dip galvanizing plants because hot dip galvanizing units are all equipped with annealing lines. Rolled hard coils are generally 20-40 tons in weight, and the coils are continuously rolled at normal temperature. The inner diameter is 610mm.
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Product features: Because it has not been annealed, its hardness is very high (HRB is greater than 90), and its machining performance is very poor. It can only perform a simple directional bending process of less than 90 degrees (perpendicular to the take-up direction).
In simple terms, cold rolling is performed on the basis of hot-rolled coils. In general, hot-rolling, pickling, and cold-rolling processes are used.
Cold rolling is performed at normal temperature by hot-rolled sheet. Although the steel sheet is heated during rolling because of rolling, cold rolling is still called. Due to cold rolling after continuous hot rolling, the mechanical properties are poor and the hardness is too high. It must be annealed to restore its mechanical properties. No annealing is called rolled hard rolls. Rolled hard rolls are generally used to make products that do not need to be bent or stretched, and have a hardness of 1.0 or less. Hard rolled luck is good on both sides or on four sides.
Cold rolling is usually annealed.