Cold Rolled steel

The difference between cold-rolled steel and hot-rolled steel is not in the smelting process, but in the rolling temperature, or the termination temperature of rolling steel. Cold rolled steel is produced when the final rolling temperature is lower than the recrystallization temperature of the steel. Hot rolled steel is easy to roll and has high rolling efficiency, but under hot rolling conditions, the steel oxidizes and the surface of the product is dark gray. Cold rolled steel requires high rolling mill power, low rolling efficiency, and intermediate annealing to eliminate work hardening during the rolling process, so the cost is also high. However, cold rolled steel has a bright surface and good quality, which can be directly used to process finished products. Therefore, cold rolled steel plates are widely used.