Hot rolled seamless steel pipe, what advantages and disadvantages? Seamless steel tube after hot rolling, grain refinement of steel, destruction of ingot casting structure, and eliminates the defects of microstructures, the steel pipe dense tissue, mechanical properties improved. Before steel pipe in the presence of bubbles, cracks and loose, after hot rolling will be welding under high temperature and high pressure.
Although hot rolling seamless steel pipe has many advantages, but its shortcomings must be clear, steel pipe after hot rolling, nonmetallic inclusions in steel is pressed into sheets, and the stratification occurs. Layered make the steel along the thickness direction of the tensile performance deteriorated significantly, in the weld contraction appear torn between the layers.
Steel after hot rolling, must have advanced technology, if the technology, however clearance, steel pipe in hot rolling of uneven cooling caused by the residual stress. The residual stress in the case of no external force is balanced. However, steel under the external force will affected by some, for example, will have certain influence on deformation, stability, anti - fatigue, etc..
Steel after hot rolling, the thickness and width of the control. Due to thermal expansion and contraction principle. At the beginning of the steel hot rolling is carried out, the length and thickness are standard, but in the end on cooling will appear some errors, for steel edge width is wider, the thickness of the film so negative difference will be more obvious.