Defects of LSAW Steel Pipe in Production

Keywords:lsaw steel pipe
Defect of lsaw steel pipe in production

[1] Residual stress formed by uneven cooling. Residual stress is the internal self-balanced stress without the effect of external force. Hot-rolled steel sections of various cross-sections have such residual stresses. Generally, the larger the section size of the steel, the residual stress is also The larger. Although the residual stress is self-balanced, it still has a certain influence on the function of the steel member under the effect of external force. For example, it may have unfavorable effects on deformation, stability, fatigue resistance, etc.;

[2] After welding, the non-metallic impurities inside the straight seam steel pipe are pressed into thin slices, and delamination occurs. The layering greatly deteriorates the tensile function of the straight seam steel pipe in the thickness direction, and it may be when the weld is shortened. Interlaminar tearing occurs. Part of the strain induced by the shortening of the weld often reaches several times the yield point strain, which is much larger than the strain caused by the load. The advantages of the submerged arc welded straight seam steel pipe: can damage the casting arrangement of the steel ingot and refine the steel Grain, and eliminate the shortcomings of the micro-arrangement, and then make the steel arrangement compact, the mechanical function is improved. This improvement is mainly reflected in the rolling direction, and then the straight seam steel pipe is no longer isotropic to a certain extent ; Bubbles, cracks and looseness formed during pouring can also be welded under the effect of high temperature pressure.
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