Most steels are rolled by hot rolling. The steel delivered in the hot-rolled state has a certain degree of corrosion resistance due to the high temperature, so it can be stored in the open air.
However, this layer of oxide scale also makes the hot-rolled steel surface rough, and the size fluctuates greatly. Therefore, the steel with smooth surface, accurate size and good mechanical properties is required to use hot-rolled semi-finished products or finished products as raw materials and then cold-rolled production.
The advantages of steel in the hot rolling process are mainly manifested in: fast forming speed, high output, without damaging the coating, and can be made into a variety of cross-sectional forms to meet the needs of use conditions; cold rolling can make steel produce a lot of the plastic deformation, thereby increasing the yield point of the steel.
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