Hot rolling: relative to cold rolling, cold rolling is rolled below the recrystallization temperature, while hot rolling is rolled above the recrystallization temperature.
Cold rolling: It is processed and rolled on the basis of hot-rolled stainless steel sheets and coils. Generally speaking, it is a process of hot rolling, pickling, and cold rolling. Although the steel sheet will heat up due to rolling during the processing, it is still called cold rolling. Since hot rolling undergoes continuous cold deformation, cold rolling has poor mechanical properties and high hardness. It must be annealed to restore its mechanical properties. Those without annealing are called hard rolled coils. Hard rolled coils are generally used to make products that do not require bending or stretching.