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Hot-rolled stainless steel pipe and cold-rolled stainless steel pipe the main difference
Oct 25, 2017

The advantage of hot-rolled stainless steel plate is that it can destroy the ingot's casting structure, refine the grain of stainless steel and eliminate the defects of microstructure, which makes the metallurgical structure of steel more compact and improve the mechanical properties. This improvement is usually mainly reflected in the rolling direction, so that the stainless steel sheet to a certain extent is no longer isotropic, but also under high temperature and pressure welding before the formation of the previous pouring bubbles, cracks and loose The

However, hot-rolled stainless steel plate also has the disadvantage, after the hot rolling, the stainless steel plate internal non-metallic inclusions (usually sulfide and oxide, as well as silicate) will be pressed into thin slices, there stratification phenomenon. Stratification will greatly degrade the performance of the steel in the thickness direction, and there may be tearing between the layers when the weld shrinks. The local strain induced by the weld shrinkage often reaches several times the yield point strain, which is much stronger than the load caused by the load; followed by uneven cooling during the hot rolling process will produce residual stress, the so-called residual stress is no external force Under the internal self-balanced stress, all kinds of cross-section of hot-rolled steel have this residual stress, the general steel cross-section size, the greater the residual stress. Although the residual stress is self-balanced, but the stainless steel components under the action of external force or will have an impact. For example, will be detrimental to the deformation of stainless steel, stability, anti-fatigue and so on.

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