Defects description: the two types of cracks in hot rolled A36 steel sheet are mainly edge cracks and small longitudinal cracks on the entire surface of the sheet. The edge cracks are deep, obvious and serious broken at edges, while the small longitudinal cracks are far away from the edge of A36 sheet and distributed on the surface of the whole sheet, and peeling occurs after cold bending.
The metallographic specimens were cut off from the defect parts by genetic analysis, and the morphology and distribution of cracks were observed by metallographic microscope after grinding and polishing, and the microstructure and morphology were observed after corrosion; the internal conditions of surface cracks of hot rolled A36 steel sheet were observed by scanning electron microscope, and the composition of inclusions was analyzed by general methods; and the causes of defects were found by these means. 2.1 Sulfur content analysis compares the S content of cracked and non-cracked A36 steel sheet produced in the same period. It is found that the S content of cracked A36 steel sheet is higher than that of non-cracked A36 steel sheet.
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