1. Appearance and surface quality: Since the cold plate is obtained after the cold rolling process of the hot plate, and some surface finishing is carried out at the same time, the cold plate is better than the hot plate in terms of surface quality (such as surface roughness). It came well, so if there is a higher requirement for the coating quality of the product, such as the subsequent painting, generally choose the cold plate, and the hot plate is divided into the pickling plate and the non-pickling plate. Normal metallic color, but not cold rolled, so the surface is not as high as the cold plate. The surface of the non-pickling plate usually has an oxide layer on the surface, which is black, or there is a black layer of iron tetroxide. , and if the storage environment is not good, it will usually bring some embroidery.
2. Performance: In general, the mechanical properties of the hot plate and the cold plate are considered to be indistinguishable in the project, although the cold plate has a certain degree of work hardening during the cold rolling process, (but it does not rule out that the mechanical properties are strictly required. , then it needs to be treated differently), the yield strength of the cold plate is usually slightly higher than that of the hot plate, and the surface hardness is also higher, depending on the degree of annealing of the cold plate. But no matter how annealed, the strength of cold plate is higher than that of hot plate.
3. Forming performance: Since the performance of the hot and cold plates is basically not too different, the influencing factors of the forming performance depend on the difference in the surface quality. Since the surface quality is better from the cold plate, generally speaking, the same material is used. Steel plate, cold plate has better forming appearance than hot plate.
"Cold" and "hot" are not cold or hot in human senses, but are distinguished according to the temperature characteristics of the steel itself during rolling. At the same time, hot rolling is the processing raw material of cold rolling. After a series of processing, cold rolling can obtain a steel plate with smooth and smooth surface, fine appearance and uniform dimensional accuracy, which is better than hot rolling.
