The application of hot-rolled steel pipe in the industry is obvious to all. Its wide application must be due to its unique advantages. However, as a successful business, we should fully understand this product, and analyze the advantages and disadvantages of hot-rolled steel pipe.
Disadvantages of hot-rolled steel pipe: 1. Residual stress caused by uneven cooling. Residual stress is the internal self-phase equilibrium stress without external force. Hot-rolled steel of various cross-sections has such residual stress. The larger the section size of general steel The residual stress is also larger. Although the residual stress is self-phase-balanced, it has certain influence on the performance of steel members under external force. For example, it may have adverse effects on deformation, stability and fatigue resistance; After hot rolling, the non-metallic inclusions inside the steel are pressed into thin sheets, and delamination occurs. The delamination greatly deteriorates the tensile properties of the steel in the thickness direction, and it is possible to cause interlaminar tears when the weld shrinks. The local strain induced by weld shrinkage often reaches several times the yield point strain, which is much larger than the strain caused by the load.
Advantages of hot-rolled steel pipe: it can destroy the casting structure of steel ingot, refine the grain of steel, and eliminate the defects of microstructure, so that the Steel Structure is compact and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction. Therefore, the steel is no longer an isotropic body to a certain extent; bubbles formed during casting, cracks and looseness can also be welded under high temperature and pressure.
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