What is the difference between cold rolled stainless steel and hot rolled stainless steel?

In simple terms, cold-rolled stainless steel plate is a steel plate with a thickness of less than 6mm and a bright surface of 2B.
Hot-rolled stainless steel plate is a steel plate with a thickness between 3mm and 16mm, and its surface has an industrial surface and a matt surface.

Hot rolled stainless steel
It uses slabs (mainly continuous casting slabs) as raw materials and is heated by roughing and finishing mills to produce strip steel. The hot-rolled steel strip of the finishing mill is cooled to a set temperature by laminar flow, and then coiled into a steel coil by a coiler. The cooled strip coils are processed into steel plates, flat coils, and longitudinal strips through different finishing lines (leveling, straightening, cross-cutting or slitting, inspection, weighing, packaging, marking, etc.) according to the different needs of users. Steel products.
Advantage:
1. Destroy the casting structure of the steel ingot, make the steel structure compact, refine the grains, and eliminate structural defects.
2. The toughness and ductility of hot-rolled stainless steel are relatively good, and the price is relatively low.
3. The torsion resistance of hot-rolled stainless steel is better than that of cold-rolled stainless steel.
shortcoming:
The results of the study are as follows:
1. The residual stress generated by uneven cooling leads to poor hot rolling deformation, stability and fatigue resistance of stainless steel.
2. The mechanical properties of hot-rolled stainless steel are far lower than cold-rolled stainless steel.

Cold rolled stainless steel is produced on the basis of hot rolled stainless steel coils. Generally speaking, it is the process of hot rolling→pickling→cold rolling. Although in the process of processing, because rolling will also make the steel plate warm, it is still called cold rolling. Since continuous cold rolling is used after hot rolling, the cold rolling mechanical properties are poor and the hardness is too high. It must be annealed to restore its mechanical properties. Hard coils without annealing are called rolled hard coils. Roll hardened coils are generally used to make products that are not bent or stretched.
Advantage:
1. The forming speed is fast, the output is high, and the coating is not damaged.
2. Strong plastic deformation ability and high yield point.
3. The surface of cold-rolled stainless steel has no oxide scale, good quality and high dimensional accuracy.
shortcoming:
1. Cold-rolled stainless steel has a small wall thickness, and its ability to withstand local concentrated loads is weak.
2. Residual stress still exists in the section of stainless steel after forming, which makes its cold rolling buckling performance worse.
3. Low toughness, easy to twist when bending, bending and torsional buckling when compressed, poor torsion performance, and more expensive.