Surface inclusion

Defect Name: surface inclusion < br / > definition and appearance: < br / > the non-metallic inclusions and slag inclusions under the skin or on the surface of the cold-rolled substrate are cracked during cold rolling and exposed on the surface of the steel strip, which are generally distributed irregularly on the surface of the thin plate in point, block, line or strip shape. Its color is generally brownish red, yellowish brown, gray white or gray black& nbsp;  & nbsp; Cause of formation: < br / > ● the cold-rolled substrate is exposed with subcutaneous inclusions after rolling or the original inclusions on the surface of the substrate remain on the surface of the strip steel after rolling (reasons for steelmaking and casting). < br / > hazards: < br / > ● may lead to holes, cracks and delaminations in subsequent processing. < br / > prevention and elimination methods: < br / > ● strictly abide by the casting system < br / > ● strengthen the surface quality inspection of cold rolled substrate. < br / > inspection judgment: < br / > ● visually inspect; < br / > ● inclusion defects are not allowed on the surface of steel strip. For local inclusion defects, it is allowed to use The grinding method shall be removed, but shall not exceed the depth and range specified in the standard< br/>