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Cold Rolled Steel Coil
The main differences between hot and cold rolling are:
1. Appearance and surface quality:
Since the cold plate is obtained after the cold rolling process of the hot plate, and the cold rolling also performs some surface finishing, the cold plate is better than the hot plate in surface quality (such as surface roughness), so if the product is There are higher requirements for coating quality such as post-painting. Generally, cold plates are selected. The other hot plates are separated into pickled plates and unsick plates. The surface of the pickled plates is normal metal color due to pickling, but not Cold rolling, so the surface is still not cold plate high, the unsick plate usually has an oxide layer on the surface, black, or there is a layer of iron tetraoxide. Generally speaking, it is fire-baked, and if the storage environment is not good, it usually has some rust.
2. Performance: under normal circumstances, the mechanical properties of hot and cold plates in the project is considered to be indistinguishable, although the cold plate has a certain degree of work hardening during the cold rolling process (but does not rule out the strict requirements on mechanical properties) , then it needs to be treated differently.) The cold plate is usually slightly higher than the yield strength of the hot plate, and the surface hardness is also higher. How to look at the degree of cold plate annealing. But no matter how the annealed cold plate strength is higher than the hot plate.
3. Forming properties due to the performance of the hot and cold plate is basically not much, so the influencing factors of the forming properties depends on the difference in surface quality, because the surface quality is better for the cold plate, so usually the same material steel plate The cold plate is better than the hot plate.