Difference between cold rolling and hot rolling

1. Substantive differences between the two:

(1) The essence of cold rolled steel: cold rolled steel is cold rolled steel production. Cold rolling is a steel plate that is further thinned to a target thickness at room temperature.

(2) The essence of hot rolled steel: hot rolled steel is a kind of steel rolled above the recrystallization temperature.

2. The characteristics of the two are different:

(1) The characteristics of cold rolled steel: cold rolled steel plate thickness is more accurate, and the surface is smooth and beautiful, but also has a variety of superior mechanical properties, especially processing properties.

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

3, the two processing requirements are different:

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

(2) hot rolled steel processing requirement: hot rolled steel rolling easily, high efficiency of steel rolling, hot rolling temperature including open rolling temperature and finishing temperature, and the determination of the main open rolling temperature is according to the alloy phase diagram of the solidus temperature of about 80%, and the determination of finishing temperature should be determined according to the alloy plasticity chart, the general requirements control above the recrystallization temperature of the alloy.

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Cold rolled strip is widely used, such as automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, canned food, etc. Cold rolled sheet steel is the abbreviation of common carbon structural steel cold rolled sheet, also known as cold rolled sheet, commonly known as cold plate, sometimes mistakenly written as cold tied sheet. Cold plate is made of ordinary carbon structural steel hot rolled steel strip, after further cold rolling into a thickness of less than 4mm steel plate. Due to rolling at room temperature, does not produce iron sheet, therefore, cold plate surface quality, high dimensional accuracy, coupled with annealing treatment, its mechanical properties and process properties are better than hot rolled thin steel sheet, in many fields, especially in the field of home appliance manufacturing, has gradually replaced hot rolled thin steel sheet.

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