What is hot-rolled steel

By definition, ingots or billets are difficult to deform and process at room temperature. Generally, it is heated to 1100-1250 for rolling. This rolling process is called hot rolling.

The end temperature of hot rolling is generally 800-900, and then it is generally cooled in the air, so the hot rolling state is equivalent to normalizing treatment.

Most steel is hot-rolled. Due to the high temperature, the steel delivered under hot rolling condition has a layer of iron oxide on the surface, so it has certain corrosion resistance and can be stored in the open air.

However, this layer of oxide scale also makes the surface of hot rolled steel rough and its size fluctuates greatly. Therefore, the steel with smooth surface, accurate size and good mechanical properties should be produced by cold rolling with hot rolled semi-finished products or finished products as raw materials.