Convex Hull Defect Of Cold Rolled Steel

Cold rolled strip steel is made of thin strip steel by cold extrusion method (no heating, instead called hot rolling). It is the material that rolls the steel into the shape we want through cold water, it is the material that is not formed by extrusion method under very cold conditions by the machine to make a thin steel with a shape, and then through various processing forms, and then through cold treatment to make the coil we need, including coil plate, coil tape, wire. Cold-rolled steel coils are also directly referred to as cold-rolled coils. At present, in terms of the treatment of steel, there are very serious problems in the cold treatment of cold-rolled steel coil convex hull defects
The main hazard of steel coil uplift is that when the convex hull defect reaches a certain degree, the steel coil will form a local wave shape after unwinding, which affects the use of users. Most of the studies on convex hull defects of cold rolled steel coil believe that the convex hull defects are caused by the local high point of the strip caused by the local wear of the work roll of the hot rolling finishing mill, and some people think that the convex hull defects can be caused by the local wave shape of the cold rolled strip. Cold-rolled strip steel is widely used in various fields, such as construction, machinery, home appliances and coating industry because of its good surface smoothness, finish and high stamping performance and dimensional accuracy. Its various advantages make it still widely used in various industries for a long time after its rapid rise.