Common Defects Of Light Cold-rolled Flat

- May 19, 2017 -

Light Cold-rolled Flat strip with a wide range of uses, such as automobile manufacturing, electrical products, locomotives and rolling stock, aviation, precision instruments, canned food and so on.

Edge crack defects

Light Cold-rolled Flat The enrichment of large inclusions present at the edge is one of the main causes of induced fissure. As the thin slab with a funnel mold, the mold inside the flow, heat transfer unevenness and liquid level fluctuations than the traditional slab continuous casting process, in the casting process will often cause slag, part of the slag residue The surface inclusions are formed on the surface of the slab, and the larger inclusions are deposited on the edge of the slab, resulting in the enrichment of the large-scale oxide inclusions.

Iron oxide skin pressure defects

Light Cold-rolled Flat An incomplete iron oxide scale is pressed into the strip during subsequent rolling to cause slab surface defects. Secondary descaling water is not open and other reasons is caused by the second iron oxide skin pressure into the key. The results of defect tracking show that the stripping defects of iron oxide are basically eliminated during the subsequent pickling and cold rolling, which will not affect the Light Cold-rolled Flat.

Surface defects

The black line - like defects on the strip surface after cold rolling. The surface defects of the cold-rolled strip are mainly from the defects of the hot-rolled base material, and the defects on the surface of the hot-rolled plate are mainly hidden, and the possibility of the cold-rolling production line itself is very small.