The process of forming hot-rolled and cold-rolled 304 stainless steel
May 13,2025
Hot rolling and cold rolling are both processes of forming steel sections or plates, which have a significant impact on the microstructure and properties of steel. Hot rolling is the main method of steel rolling, while cold rolling is only used to produce small-sized steel sections and thin plates.
One The advantages of hot rolling can destroy the casting structure of steel ingots, refine the grain size of steel, and eliminate defects in the microstructure, thereby making the structure of 304 stainless steel plate dense and improving its 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 high temperature and pressure. Disadvantage 1: After hot rolling, non-metallic inclusions (mainly sulfides, oxides, and silicates) inside the steel are compressed into thin sheets, resulting in delamination (interlayer) phenomenon. As a widely used steel, 304 stainless steel has excellent corrosion resistance, high temperature resistance, low temperature strength, and mechanical properties; Good hot working properties such as stamping and bending, no heat treatment hardening phenomenon (non-magnetic, operating temperature -196 ℃~800 ℃).
Stainless steel product specifications: 1. Stainless steel plate: 1.0~3.0mm 1219 * 2438 1000 * 2000mm. 3~80mm 0 * 60002. Stainless steel coil: width 1219 1000 1500 1800mm3. Stainless steel strip: width can be customized. 4. Stainless steel pipe: outer diameter Φ 6-377mm, wall thickness Φ (seamless). The outer diameter of the welded pipe is between 10-1210mm, and the wall thickness is between. Layering greatly deteriorates the tensile properties of steel along the thickness direction, and there is a possibility of interlayer tearing during weld shrinkage. The local strain induced by weld shrinkage often reaches several times the yield point strain, much larger than the strain caused by load; 2. Residual stress caused by uneven cooling. Residual stress is the stress that self balances internally without external force, and various hot-rolled steel sections have such residual stress. Generally, the larger the cross-sectional size of the steel section, the greater the residual stress. Although residual stress is self balanced, it still has a certain impact on the performance of steel components under external force
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