Hot rolling and cold rolling are the two main process for the most steel or steel plate making, which have great influences on the structure and properties of the steel. A better rolling mill roll will bring more superior quality steel. Which one is better between the hot rolled steel and cold rolled steel?
Some information about the hot rolled steel and cold rolled steel is introduced.
Hot Rolled Steel
Definition
Hot rolled steel is the finished product through directly processed on the steel mold in the steel furnace with exceptionally high temperatures, rolling with the hot mill roller which can make sure the dimensions of the steel sheet according to the requirements., then coiled and cooling. The main steel rolling type is hot rolling.
Advantages
Compact the steel structure and improve the mechanical properties.
Disadvantages
1.After hot rolling, delamination occurs, when the non-metallic inclusions in the steel are pressed into thin sheet. Delamination greatly deteriorates the tensile properties of the steel.
2. Residual Stress caused by uneven cooling. Residual stress is an internal self-phase equilibrium stress without external force. Hot rolled steel may have negative effects on deformation, stability, fatigue resistance, etc.
Cold Rolled Steel
Definition
The cold rolled steel bar is obtained by cold working of the hot-rolled steel, such as cold drawing and stretching at a normal temperature. Cold rolling is often used for the production of small sections and steel sheets.
Advantages
Cold rolled steel bar has fast forming speed and high output. It can be made into a variety of cross-sectional forms to meet the requirements of the different use conditions. Cold rolling mill can make the steel have a large plastic deformation.
Disadvantages
Torsion is prone to occur under bending. Bending and torsional buckling is easy to occur under compression. So the torsional performance of cold rolled steel is poor, and the ability to withstand concentrated loads is weak.
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