What Is The Difference Between Hot Rolling And Cold Rolling Of Stainless Steel?

What is the difference between hot rolling and cold rolling of stainless steel?

Stainless steel is shipped from the factory in the form of cold-rolled or hot-rolled coils or plates. The material thickness varies depending on the rolling method, and the general thickness is 0.3~13mm. Coils and plates can be provided directly to users after leaving the factory, or can be transported to deep processing plants for further polishing, or made into various finished products or semi-finished products, and then provided to wholesalers or users.
1 Stainless steel processing methods The production of stainless steel can be roughly divided into two stages: smelting (steelmaking and casting) and processing (blanking, hot rolling, cold rolling, pipe making, wire drawing, etc.). Steelmaking and casting are key processes in the stainless steel production process. It not only determines the chemical composition of the steel produced, but also plays an important role in ensuring product quality, reducing production costs, and improving production efficiency. Due to the characteristics of stainless steel and the special requirements for product quality, the steelmaking and casting processes in the front process and the hot rolling, cold rolling, heat treatment and other rear processes have characteristics different from ordinary steel. There is a unique process system, corresponding Many new processes and equipment have also been adopted. The smelting and processing technology of stainless steel has developed rapidly compared with ordinary steel.

1.1 Stainless steel cold rolling Cold rolling refers to processing steel plates or steel strips into various types of steel through cold drawing, cold bending, cold drawing and other cold processing at normal temperature. Cold rolling has fast forming speed, high output, and does not damage the coating. It can be made into a variety of cross-sectional forms to adapt to the needs of use conditions; cold rolling can cause large plastic deformation of steel, thereby improving the yield of the steel. point. Another feature of stainless steel is that cold-rolled plates have a variety of surface processing methods depending on the usage. In addition, there are pattern plates (that is, using embossing or etching methods to form various patterns on the surface to enhance the decorative effect), and colored plates (that is, soaking stainless steel in certain solutions to make the surface oxide film show different colors) And coated panels, etc. These different surface processing methods make stainless steel widely used in architectural decoration, daily appliances and works of art.
1.2 Hot rolling of stainless steel Hot rolling can destroy the casting structure of the steel ingot, refine the grains of the steel, and eliminate defects in the microstructure, thereby making the steel structure dense and improving the mechanical properties. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent; bubbles, cracks and looseness formed during pouring can also be welded under the action of high temperature and pressure. The mechanical properties of hot-rolled stainless steel plates are far inferior to those of cold processing and inferior to forging. At the same time, the surface of hot-rolled stainless steel is rough and uneven, which limits its use in construction. Therefore, most stainless steel products are processed by cold rolling.