Steel Pipe Surface Defects

From the use of point of view, the mild steel pipe surface defects can be divided into three categories: 

① high temperature oxides, scarring, double skin, pits, and other types of defects. Such defects are generally not related to the "internal injuries" of the materials, manufacturing 
standards allow a certain size (depth) of defects, should be cleared for defects exceeding. 

② mechanical bumps. Such defects are neither involved in "internal injuries" not involved in processing the merits of the defect outline is clear, it is considered to be the most sensitive class of defects. Therefore allow the existence of indicators more relaxed than the first. 

③ cracks class defects (cracks). The existence of such defects often precedes the rationality of the process, especially when the carbon steel pipe surface cracks indicates that the steel pipe inside the metal in an unstable state. Therefore, when such defects, the removal of excessive defects at the same time, but also to analyze the causes in order to determine the merits of the intrinsic quality of the material, if necessary, add other test measures. In addition, such defects were sharp shape, sensitive to the most serious shortage of El, so often given the more stringent restrictions on the project.


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