Hot rolled is also used for truck frames and automobile seat frames. For this application the metal typically goes through the processes of pickle and oiling (P&O) before it is used to help prevent rusting and allow for painting
It’s important to note that the main difference between hot rolled and cold rolled steel is one of process. “Hot rolling” refers to processing done with heat. “Cold rolling” refers to processes done at or near room temperature. … It may seem obvious, but some types of steel are better suited for certain applications
CR sheets or cold rolled sheets are hot rolled products which provides a superior surface finish, with improved physical properties of the steel, such as high formability, high strength, excellent dent resistance, good magnetic properties, tensile strength, and workability and welding properties.
The Heating Process
The process in which hot rolled is produced begins with heating slabs of steel to approximately 2,300 degrees Fahrenheit. The amount of heat directly affects the properties of the steel. Meaning, if the temperature is not high enough it can cause defects in the material.