Cold Rolling And Hot Rolling Of 304 Stainless Steel Plate
Mar 15, 2023
Both hot rolling and cold rolling are processes for forming 304 stainless steel plate or steel plate. They have a great influence on the arrangement and function of 304 stainless steel. The rolling of steel is mainly hot rolling, and cold rolling is only used for small production. Size steel and sheet.
1. Cold rolled
It refers to the processing of steel plates or steel strips into various types of steel through cold drawing, cold bending, and cold drawing at room temperature.
Advantages: fast forming speed, high output, and does not harm the coating. It can be made into a variety of cross-sectional methods to meet the requirements of the application conditions; cold rolling can cause large plastic deformation of the steel, and then increase the yield of the steel point.
Disadvantages: 1. Although there is no thermal plastic shrinkage during the forming process, there are still residual stresses in the section, which will inevitably affect the reluctant properties of the whole and part of the steel.
2. The cold-rolled section steel style is generally open section, which makes the section's safety and rigidity lower. There is a slight change in the bending, and the bending and torsion is slightly reluctant when under pressure, and the torsion resistance is poor;
3. The wall thickness of cold-rolled formed steel is small, and there is no thickening at the corners of the plate connection, and the ability to withstand partial combined loads is weak
2. Hot rolled
Benefits: It can damage the casting arrangement of the steel ingot, refine the grain of the steel, and eliminate the defects of the micro-arrangement, so that the steel arrangement is dense and the mechanical function is improved. 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 casting can also be welded under the effect of high temperature and pressure.
Defects: 1. After hot rolling, the non-metallic inclusions (mainly sulfides and oxides, as well as silicates) inside the steel are pressed into thin sheets, showing delamination (interlayer). The delamination greatly deteriorates the tensile function of the steel in the thickness direction, and it is possible to show interlayer tearing when the weld is shortened. Part of the strain induced by weld shortening often reaches several times the yield point strain, which is much larger than the strain caused by the load.
2. Residual stress caused by uneven cooling. Residual stress is the internal self-balanced stress without the effect of external force. Hot-rolled steel sections of various cross-sections have such residual stresses. Generally, the larger the section standard of section steel, the greater the residual stress. Although the residual stress is self-balanced, it still has a certain influence on the function of the steel member under the effect of external force. For example, it may have adverse effects on deformation, stability, and fatigue resistance.
3D Virtual Pavilion
Douyin Official Media
Flagship Micro Mall
WeChat Public Number
CONTACT US
Email : enquiry@jiuzhoumetal.com
Mobile: +86-15966669999
Wechat: +86-15966669999
Whatsapp: +86-15966669999
Tel : +86-531-86888888
Address : China Resources Land Plaza, Lixia District, Jinan City, Shandong Province