indentation

Defect Name: indentation (impression and indentation) < br / > definition and appearance: < br / > concave convex impression without periodic distribution on the surface of steel strip is called indentation.  & nbsp; Cause: < br / > ● foreign matters are pressed in and form pits after falling off< Br / > ● mechanical damage caused during coil handling< Br / > ● the locking buckle of the packing belt is pressed on the surface of the steel strip< Br / > hazard: ● affect the surface quality of the steel strip, and make the steel strip unusable in serious cases< Br / > prevention and elimination methods: < br / > ● prevent foreign matters from being pressed in< Br / > ● carefully handle the steel coil to prevent mechanical damage< Br / > ● prevent the buckle of the packing belt from being pressed against the steel strip surface< Br / > inspection and judgment: < br / > ● check with naked eyes and measure the depth (height) with measuring tools if necessary; < br / > ● slight indentation (indentation) is allowed, but its depth or height shall not exceed the provisions of the standard. < br / >