So far, there are still many customers who can't distinguish between cold rolling and hot rolling of stainless steel. Generally speaking, the surface of a cold-rolled stainless steel plate is bright, smooth, and beautiful; The surface of a hot-rolled stainless steel plate belongs to the industrial surface, rough surface, and feels like a little hand.



Hot rolling: compared with cold rolling, cold rolling is rolling below the recrystallization temperature, and hot rolling is rolling above the recrystallization temperature.



Its characteristics:



1. Poor toughness and surface flatness, low price;



2. The temperature of hot rolling is close to that of forging;



3. The hot plate is processed by hot rolling, and the surface has oxide skin, and the thickness of the plate has a different;



4. Because of its production technology, it is more in civil areas, such as tableware, general household appliances, etc;



5. The mechanical properties of hot-rolled stainless steel plate are far inferior to cold working and forging, but it has better toughness and ductility.



Cold rolling: it is processed and rolled on the basis of a hot-rolled stainless steel sheet and coil. Generally speaking, it is a processing process of hot rolling → pickling → cold rolling. Although the temperature of stainless steel plates will rise due to rolling in the processing process, it is still called cold rolling. Cold rolling, which is formed by continuous cold deformation after hot rolling, has poor mechanical properties and high hardness. Only after annealing can its mechanical properties be restored. Those without annealing are called rolled hard coils. The rolled coil is generally used to make products without bending and stretching.



Its characteristics:



1. Cold-rolled stainless steel sheet has a certain degree of work hardening, low toughness, and high price;



2. Cold rolled surface is free of oxide skin, with good quality;



3. The product made of cold deformation has high dimensional accuracy and good surface quality;



4. Cold-rolled stainless steel plate is widely used in all walks of life because of its production process, such as all kinds of cold stamping parts, cold-rolled cold extruded profiles, cold coil springs, cold drawn wires, cold heading bolts, etc.