Steel is not subjected to special heat treatment after hot rolling or forging, and is delivered directly after cooling, which is called the hot rolling or hot forging state. The termination temperature of hot rolling (forging) is generally 800-900 ℃, and then it is generally naturally cooled in air. Therefore, the hot rolling (forging) state is equivalent to normalizing treatment. The difference is that the termination temperature of hot rolling (forging) varies, unlike the strict temperature control of normalizing heating, so the fluctuation of steel structure and properties is greater than that of normalizing. Many steel companies adopt controlled rolling. Due to strict temperature control during final rolling and forced cooling measures after final rolling, the grain size of the steel is refined, and the delivered steel has high comprehensive mechanical properties.
1. When preparing raw materials, the boards should be placed at zero distance or back-to-back. In addition, special attention should be paid to the wear and tear of the tools and whether there are burrs.
2. When performing laser processing, the first step is to confirm whether there are scratches on the feed material, in order to check the quality of the feed material. If there is any scratch, it should be returned and no further processing is allowed.
3. When bending steel, first check whether there are debris or foreign objects on the upper and lower molds and steel. If it exists, bending operation cannot be performed to prevent the steel from being crushed.
4. When welding steel, the welding workbench should be kept clean, flat, and free of foreign objects. If there is any, it should be cleared immediately.
5. If you need to repaint the product, you must first register and then proceed with the operation.
6. If the parts are scratched, they should be reported immediately and dealt with immediately. It cannot be postponed.
