Advantages:
Hot rolling can make the structure of hot rolled seamless pipe dense and improve the the mechanical properties by refining the grain of the hot rolled seamless pipe and eliminatting the defects of the microstructure. This improvement is mainly reflected in the rolling direction, so that the hot rolled seamless pipe can be welded under the action of high temperature and pressure.
Disadvantages:
1.After the seamless pipe is hot rolled, the internal non-metallic inclusions can be pressed into thin slices, and the phenomenon of delamination appears. Delamination greatly deteriorates the tensile properties of the hot rolled seamless pipe in the thickness direction, and it is possible that interlayer tearing may occur when the weld shrinks.
2.Uneven cooling will cause residual stress. Residual stress refers to the internal self-balanced stress without external force. Various hot rolled seamless pipes have such residual stresses. In general, the larger the section size of the steel, the greater the residual stress. Although the residual stress is self-balanced, it still has a certain influence on the performance of hot rolled seamless pipe components under external force.
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