Cold rolled and Hot rolled steel plates are both processes of forming steel plates, which have a significant influence on the performance of the steel. Hot rolled steel sheets are mainly used in the production of steel structure parts, bridges, ships and vehicles.
Because of the high temperature, the surface of the Hot rolled steel plate is covered by iron oxide scale, thus providing a certain level of corrosion resistance and allowing open-air storage. However, this layer of iron oxide plate can also make its surface rough, with large dimensional fluctuations. Therefore, the requirement is that the steel should have a clean surface, accurate dimensions and good mechanical properties. The advantages are that it is fast forming, high output and no damage to the coating, which can be made into a wide variety of cross-sectional forms to suit the corresponding conditions of use.
The strength of the Hot rolled steel plate is relatively low and the quality of its surface is poor. But the plasticity is good.
Hot rolled steel plate, whose mechanical properties are far from the products of cold processing, also second to the products of forging processing, but it has better toughness and ductility. The product has the trend of partial replacement of cold rolled steel plates for its price is moderate. Thus, it is popular with many users.