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BLOCKING
It is a defect arising out of transition of paint layer between top and back by local friction between coils because of impact of movement and loading when transporting, which means periodic exfoliation of paint layers. |
WHITE COLOR RUST
It is a defect that a white spot is occurred on the plating face of product or blistering is occurred on there after painting, which is caused by condensation or penetration of external moisture or water in keeping it for a long period. |
RED COLOR RUST
It is a defect that a dark red rust is occurred on a painting layer of the surface, which is caused by metal fragments generated in processing or rust generated by contact moisture with a damaged spot. |
DENT
It is a defect generated from mutual transference of a top paint layer and a back paint layer due to local friction between coils when carrying and loading of the product, which causes flaking of a paint layer on a certain cycle. |
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HANDLING MARK
It is a defect generated by impact bumped with a transportation device or other equipment or a building when carrying a product, which causes a severe defect and damage on product shape. |
DEW CONDENSATION
It is a defect forming fine water drops gathering on the surface of product because of low moisture temperature from temperature difference between day and night or seasons, which causes white color rust in keeping it a long period. |
Blacking Scab
It is a defect that black spots are crumpled up as an image of point on the surface of plate, is generated on the same place and as the same pattern on the front and rear side. It is caused by friction and/or pressure of plating layers arising out of shaking from loose hookup at the contacting section between coils in carrying for a long distance. |
CRYSTAL FRAIN INGOT
It is a defect that the surface of possessed steel plate is changed as the shell of orange in drawing, which causes rough surface after processing and blistering after plating. It is shown only in deforming by ~ and is generated if a coil with a low reduction(draft) ratio is annealed at high temperature for a long time. |
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Center Wave
It is a defect shown as a gentle wave by orientation at the center of a central wave plate, which may not be used for a plane table or blanking line. It may be generated if non-uniform thickness of hot coil is partially thickened in cold rolling or the relation between hot coil crown and cold rolling croen is inappropriate. |
Edge Wave
It is a bended defect shown toward the direction of rolling like wave because of non-uniform orientation on one side or both sides of material plate, and its affection and cause to a product is almost same as medium wave. |
