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Cold-rolled Production Process
Jan 07, 2017

Cold usually in longitudinal rolling way. Cold-rolled production process generally includes raw material preparation, rolling, degreasing, pickling, annealing (heat treatment), finishing, etc. Cold rolled hot rolled products as raw materials, cold rolling raw material before the first removal to ensure that the surface of cold rolled products. Rolling is the main process of deformation of the material. Aimed at removal of degreasing on rolling with rolling lubricants to avoid pollution when annealing steel surfaces of stainless steel to prevent carbon. Annealing including annealing and heat treatment of finished products, intermediate annealing is produced for eliminated by recrystallization of cold work hardening, to restore the material and reduce metal plastic deformation resistance. Finished outside of by recrystallization to eliminate hardening, heat treatment purposes. Also according to the technical requirements of the product to obtain the required Organization (such as a variety of textures, etc) and properties (such as deep drawing, magnetic properties, etc). Finished including checking, cropping and straightening (flat) classification, printing, packaging and so on. Cold-rolled products have very high packing requirements to prevent the product surface is scratched during transport. In addition to the above processes external to produce special products also have their own special procedures. When rolling silicon steel plate, in front of the cold-rolled to decarburizing annealing, coating, high temperature annealing after rolling straightening, stretching (see tension straightening) and tempering.
Two-roll for cold rolling strip mill rolling mill, mill and roller mill. Most widely used is the four-roll mill. Rolled thinner products using roller mill. How many types of roller mill, such as six-high mill, eight-roller mill, 12 mill, 20-high rolling mill (Mill). With the improvement of flatness requirements, developed many improvements to the technology, such as bending technology, breakthrough technologies and cross-roll technology. Cold rolling strip mills arranged in racks can be divided into single reversible or not reversible with two classes in a row. The former applied to producing and less bulk or proportion of alloy steel products. Low investment, the plant, but the output is low, the metal consumption. Continuous rolling rack suitable for product variety than single or little change, it has the advantages of high efficiency, large output, but heavy investment. And hot strip (see hot even rolling broadband steel production process, and hot narrowband steel production) compared, cold rolled strip (see cold rolled Board with production) of rolling process has following features: (1) used process lubrication and cooling, to reduced rolling Shi of deformation anti-force and cooling roll; (2) used big tension rolling, to reduced deformation anti-force and keep rolling process of stable. Tension of the average unit value for the yield strength of the material 10%~60%, generally not more than 50% and (3) by rolling thread rolling. Due to the cold-rolling work-hardening of the material, when the total deformation when 60%~80% is reached, continued deformation becomes very difficult. Annealing, softening of the material after rolling to continue. In order to get the Strip, the intermediate annealing may need to be repeated. Rolling between two intermediate annealing is referred to as a rolling process. The continuous annealing of cold rolled steel strip in protective gas annealing furnace or in a Bell-type annealing furnace (see cold Strip annealing). Minimum thickness for cold rolled strips currently available to 0.05mm, cold foil can be reached 0.001mm.