Hot-rolled seamless tube defects

Hot rolled seamless steel pipe
Hot-rolled seamless steel pipe production base deformation process can be summarized as three stages: perforation, extension and finishing.
Hot-rolled seamless pipe has following shortcomings:

(1) The products for hot-rolled steel pipe is not easy to control the edge width and thickness. Although we are familiar with expansion and contraction due to the beginning of the hot rolled out length, thickness up to the final cooling or negative difference,the wider this negative edge width is, the more obvious the thickness is.

(2) The steel within the non-metallic inclusions (mainly sulfides and oxides, silicates) were pressed into thin slices after hot rolling and a layered (laminated) phenomenon. Layered steel thickness direction by the pull of the performance deteriorated significantly, and may weld contraction between layers tear. Weld contraction-induced local strain often reach several times the yield point strain, much larger than the load caused by the strain;

(3) The residual stress is self-phase equilibrium stress, a variety of cross-section of hot-rolled steel has such there is no external force, internal residual stress, the greater the general steel section size, residual stress. Although the residual stress is self-phase equilibrium, but still has some influence on the performance of steel members under loads. Such as deformation, stability, anti-fatigue may adversely.

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