The purpose of packaging raw flat steel strip profile

Raw smooth introduction to the purpose of the packaging steel strip after recrystallization annealing of cold rolled strip steel, need to be level off, in order to improve the performance of cold rolled strip steel, straightness and surface quality, etc. Flat is actually a small deformation of cold rolling process, general, elongation is 0. 5 - 3%, the individual is 5%, even up to 10%. Using a larger delay control rate is mainly in order to improve the strip steel strength and hardness. Cold rolled steel strip of straightness is an important quality index. Flat can reduce or eliminate the wave shape when rolling, improve the flatness of strip steel, thus improve the quality of the product. In order to improve strip flatness, temper mill roll diameter should be possible to choose a few bigger, so is good for flatness improvement. Flat, according to the requirement of the product, can use of grinding, polishing and sanding state of three kinds of roll surface, in order to obtain different strip surface roughness. Rolling surface defects, such as roll embossing, printing, and so on, can eliminate or reduce after flattening, flat to raise first-grade product rate of 10 - 20%. Flat steel plate thickness uniformity is improved, such as the thickness of the flat steel plate, flat on both sides of the former and middle thickness difference of 0. 02 m and level off after the drop to zero. 01mm。 Deep drawing steel must be shall be smooth, so as to eliminate the yield platform, improve deep drawing performance.