The difference between cold rolled steel and hot rolled steel

Cold rolled steel is steel produced by cold rolling. Cold rolling is a steel sheet obtained by further thinning the No. 1 steel sheet to a target thickness under room temperature conditions. Compared with hot-rolled steel, cold-rolled steel has a more precise thickness, smooth and beautiful surface, and also has various superior mechanical properties, especially in terms of processability. Because cold-rolled raw coils are relatively brittle and hard, and are not suitable for processing, cold-rolled steel sheets are usually required to be annealed, pickled and surface smoothed before being delivered to customers.

The difference between cold-rolled steel and hot-rolled steel is not in the smelting process, but in the rolling temperature, or the end temperature of rolling. Cold-rolled steel is 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-rolled conditions, the steel is oxidized, and the surface of the product is dark gray. Cold-rolled steel requires high rolling mill power and low rolling efficiency, and intermediate annealing is required to eliminate work hardening during the rolling process, so the cost is also high, but cold-rolled steel has a bright surface and good quality, and can be directly used for processing. The finished product, so cold-rolled steel sheet is widely used.

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The main classification of cold rolled steel coil

Several common cold rolled sheet steels and their uses