What does plain cold pressing hot steel mean?

What does plain cold pressing hot steel mean?

Hot rolled steel coil as raw material by pickling descaling after cold rolling, the finished rolling hard volumes, due to continuous deformation caused by cold hardening the volume rolling hard strength, hardness, toughness index rise decline, so the stamping performance will deteriorate, only for a simple deformation of parts. Rolled hard rolls can be used as raw material for hot galvanizing plants, because the hot galvanizing units are equipped with annealing lines. The roll weight is usually 6~13.5 tons, and the inside diameter of the steel coil is 610mm.Generally cold continuous rolling plate and roll should be annealed by continuous annealing (CAPL unit) or bell type furnace to eliminate cold work hardening and rolling stress, and meet the corresponding standard mechanical performance indexes.Cold-rolled steel sheet surface quality, appearance and size accuracy are superior to hot-rolled plate, and its product thickness of rolling thin to about 0.18mm, and therefore favored by the majority of users. The cold-rolled steel coil is used as the base plate to make the deep processing of the product become a high added value product. Such as galvanized, hot galvanized, fingerprint resistant zinc plating, color coated steel coil and vibration damping composite steel plate, PVC coated steel plate, etc., so that these products have beautiful, high corrosion resistance and other good quality, has been widely used. Cold rolled steel coils must be refined after annealing, including cutting head, tail, trimming, leveling, flattening, rewinding, or slitting. Cold rolled products are widely used in automobile manufacturing, household electrical appliances, instrument switches, building, office furniture and other industries. The weight of each package after the 3~5 tons steel strapping. Leveling weight is generally 3~10 tons / volume. Inside diameter of steel coil 610mm.

With the continuous casting slab or as raw material, after reheating furnace heating, descaling into the roughing mill of high pressure water, roughing material by cutting head, tail, and then enter the finishing mill, the implementation of the computer controlled rolling, after finishing through the laminar cooling (computer controlled cooling rate) and coiler, become straight hair volume. Hair straightenerrollhead, tail tongue shapeand thefishtail shape, thickness, width of poor accuracy, edgehaswavy, folding, tower and other defects. The coil weight is heavy, and the inner diameter of the steel coil is 760mm. (general management industry likes to use. Thestraightthroughcutting) cutting head, tail cutting, trimming and multipass straightening and leveling finishing line processing, cutting board or heavy volume, which becomes: hot rolled steel plate and flat steel coils, slittingstripand other products. Hot finishing rolling by pickling descaling and oil is made by pickling hot-rolled coils. This product has the tendency to replace the cold rolled plate locally, the price is moderate, and is well liked by the customers. Baosteel's new investment in a hot pickling line is under construction.

Die casting ingot hot charging and hot delivery and adopt new technology, into the soaking pit, and then into a slab, billet, billet and bloom products through the blooming mill and billet rolling, after cutting head, cutting tail, surface cleaning, (flame cleaning and polishing) of high quality products is needed and inspection on rolling peeling blank, after inspection of storage. At present, the products are slab mill, rolling billet, billet, oxygen bottle gear with round billet, steel used for railway vehicle axle billet and mold. The main supply of hot rolled slab billet rolling plant as raw material; in addition to some external supply, mainly sent to the high-speed wire rolling mill as raw material. Due to the advanced nature of continuous casting slab, slab demand greatly reduced, so the other products to.

The hot metal from the torpedo car can be poured into the converter as the main burden after being treated by desulphurization and slag disposal, etc., with the addition of scrap steel below 10%. Then, burning into the converter oxygen blowing, excess carbon in molten iron by oxidation and release large amounts of heat, when the probe is measured to reach a predetermined low carbon content, namely stop blowing and tapping. In general, the ladle needs to be deoxidized and adjusted to operate the ingredients. Then, the carbonized rice hull is cast on the surface of the liquid steel to prevent the molten steel from being oxidized and sent to the continuous casting or die casting work area. For high requirement steel, increasing bottom blowing argon, RH vacuum treatment, spraying powder treatment (spraying SI - CA powder and denatured lime) can effectively reduce gas and inclusion in steel, and further reduce carbon and reduce sulfur. After these measures are refined, the ingredients can be adjusted to meet the demand of high quality steel.

The main task of steelmaking is to adjust the content of carbon and alloy elements in the steel to the required range according to the quality requirements of the steelmaking products, and to reduce the impurities such as P, S, H, O and N to the allowable limit. The steelmaking process is essentially an oxidation process in which excess carbon in the charge is oxidized and burned into CO gas to escape, and other Si, P and Mn are oxidized into the slag. S part enters refining slag, part produces SO2 eduction. When the composition and temperature of the molten steel reach the technological requirements, tapping can be made. In order to remove excess oxygen in the steel and to adjust the chemical composition, Deoxidizer and iron alloy or alloy elements can be added.