Three differences between cold-rolled steel and hot-rolled steel

 　　1. The essence of the two is different:

　　(1) The essence of cold rolled steel: Cold rolled steel is steel produced through cold rolling. Cold rolling is the process of further rolling a steel plate to a target thickness at room temperature.

　　(2) The essence of hot rolled steel: Hot rolled steel is a type of steel produced by rolling above the recrystallization temperature.

　　2. The characteristics of the two are different:

　　(1) The characteristics of cold rolled steel: The thickness of cold rolled steel plate is more accurate, and the surface is smooth and beautiful. At the same time, it also has various superior mechanical properties, especially in terms of processing performance.

　　(2) The characteristics of hot rolled steel: During hot rolling, the metal has high plasticity and low deformation resistance, greatly reducing the energy consumption of metal deformation. Hot rolling can improve the processing performance of metals and alloys, that is, the coarse grains in the cast state are broken, significant cracks are healed, casting defects are reduced or eliminated, and the cast structure is transformed into a deformed structure, thereby improving the processing performance of alloys.

　　3. The processing requirements for the two are different:

　　(1) Processing requirements of cold rolled steel: cold rolled steel requires high mill power and low rolling efficiency, and intermediate annealing is also required to eliminate work hardening during rolling, so the cost is also high.

　　(2) Processing requirements for hot rolled steel: Hot rolled steel is easy to roll and has high rolling efficiency. The hot rolling temperature includes the starting and ending rolling temperatures. The determination of the starting and ending rolling temperature is mainly based on about 80% of the solidus temperature in the alloy phase diagram, and the determination of the ending rolling temperature should be based on the plasticity diagram of the alloy, generally controlled above the recrystallization temperature of the alloy.



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