Cold rolled coil is made of hot rolled coil at room temperature below recrystallization temperature, including coil and coil, which can be produced by many domestic steel mills such as Baosteel, WISCO and Angang. Among them, sheet delivery is called steel plate, also called box plate or flat plate; Long and rolled delivery is called steel strip, also known as rolled plate. Definition of cold rolling; It is rolling under recrystallization, but it is generally understood as rolling with materials rolled at room temperature. Cold rolling of aluminum can be divided into plate rolling and foil rolling. The thickness above 0. 15~ is called a plate, and the thickness below 0. 15~ is called a foil. In Europe and America, 3~6 tandem mills are often used as the production process of cold rolling equipment. Because there is no heating in the production process, there are no defects such as pits and scale that often appear in hot rolling. Moreover, the dimensional accuracy of cold-rolled products is high, and the properties and microstructure of products can meet some special requirements, such as electromagnetic properties and deep drawing properties. Specification: thickness 0.2-4 mm, width 600-2000 mm, steel plate length 1 200-6000 mm. Trademarks: Q 195A-Q235A, Q 195AF-Q235AF, q295a (b)-q345a (b); SPCC、SPCD、SPCE、ST 12- 15； DC0 1-06 Performance: Low carbon steel is mainly used, which requires good cold bending and welding performance and certain stamping performance. Uses: Cold rolled strip steel is widely used, such as automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, canned food and so on. Cold-rolled steel plate is the abbreviation of common carbon structural steel cold-rolled sheet, also known as cold-rolled sheet, commonly known as cold plate, sometimes mistakenly written as cold-rolled sheet. The cold plate is a steel plate with a thickness of less than 4mm, which is made of common carbon structural steel hot rolled steel strip by further cold rolling. Because the normal temperature rolling does not produce scale, the surface quality of the cold plate is good and the dimensional accuracy is high. In addition, its mechanical properties and technological properties are better than hot-rolled steel plates, and it has been gradually used to replace hot-rolled steel plates in many fields, especially in the field of household appliances manufacturing. Applicable brands: Q 195, Q2 15, Q235, Q275；; SPCC (Japanese brand); ST 12 (German brand) symbol: 1, q-the yield point (limit) code of ordinary carbon structural steel, which is the first Chinese phonetic alphabet of Qu; 195, 2 15, 235, 255, 275— numerical values indicating their yield points (limits) respectively, with the unit of MPa (n/mm2); The comprehensive mechanical properties of Q235 steel, such as strength, plasticity, toughness and weldability, are the best among ordinary carbon structural steels and can meet the general requirements, so it is widely used. 2.s steel, P plate, C cold, and the fourth C ordinary. 3.ST steel, 12- common cold-rolled steel plate, marked: dimensional accuracy-size-steel plate variety standard cold-rolled steel plate: steel grade-technical conditions standard marked example: B-0.57501500-GB 708-88; Steel plate, standard number Q/BQB402, brand SPCC, annealing+flattening (S) in heat treatment state, pitted surface D in surface treatment state, trimmed (trimmed EC, uncut EM) steel plate, surface quality FB, thickness 0.5mm, accuracy B, accuracy 1000mm, accuracy A, length 2000 mm. Cold-rolled steel plate: Q225-GB9 12-89 The main producing areas are: Baosteel, Angang, Benxi Steel, WISCO, Hangang, Baotou Steel, Tangshan Steel, Lianyuan Steel, Jigang and other cold-rolled ordinary steel plates: made of ordinary carbon structural steel or low-alloy structural steel. The surface quality of cold-rolled plate is good. Has good stamping performance. It is required to ensure that cold bending and cup test are qualified, and it is often used as raw material for automobile and other industries and coated plates. Cold-rolled high-quality steel plate: it mainly includes all kinds of high-quality steel cold-rolled steel plates, the most commonly used is carbon structural steel plate, especially cold-rolled steel plate for deep drawing, which is made of low-carbon high-quality steel 08Al, and the steel plates are divided into three groups according to surface quality; Ⅰ, Ⅱ and Ⅲ represent specially advanced, advanced and advanced finish surfaces respectively. According to the drawing level, it is divided into ZF, HF and F levels (representing the most complicated, complicated and complicated parts for stamping), and according to the allowable deviation of steel plate thickness, it is divided into A and B levels, which are widely used in automobile and tractor industries. Cold-rolled steel plates have smooth surfaces and excellent processability, and are used in household appliances such as automobiles, refrigerators and washing machines, as well as industrial equipment and various building materials. With the development of economy, cold-rolled steel plate has been called an essential material in modern society. Classification of cold-rolled products: hot-rolled pickling, hot-rolled coil, common cold-rolled, galvanized (electro-galvanized, fingerprint-resistant, hot-galvanized), aluminized zinc, tinned, color coated, electrical steel (silicon steel sheet), etc. 1, hot-rolled pickling: 2, hard rolling: hot-rolled pickling coil is continuously rolled at room temperature. Product features: Because it has not been annealed, its hardness is very high (HRB is greater than 90) and its machinability is very poor. It can simply bend less than 90 degrees (perpendicular to the winding direction). Application: (1) annealing and processing into common cold rolling; (2) galvanizing by a galvanizing unit with an annealing pretreatment device; (3) Panels that basically do not need to be processed. Commonly used steel grades are CDCM-SPCC (SPCD, SPCE, ST 12, ST 13, ST 14, BLC, BLD, BUSD, BSUFD, etc. ), but their performance is basically the same. 3. Ordinary cold rolling; 4. Galvanizing; 5. Aluminum-zinc plating: 55% aluminum, 43.4% zinc and 65,438+0.6% silicon are plated on the surface of steel plate by continuous melting plating process. Product features: (1) Good durability and longer service life compared with galvanized steel plate; (2) It has good heat resistance and is not easy to change color at high temperature compared with galvanized steel sheet; (3) It has good thermal reflectivity; (4) It has a silvery white gorgeous surface; (5) It has processability and spraying performance similar to that of galvanized steel sheet; (6) It has good welding performance. Scope of application: galvanized sheet is in use in demand industries. 6. Tin plating (tinplate): Tin plating with frosted insoluble anode is adopted. 7. Color painting; 8. Electrical steel (silicon steel sheet). Pickled sheet is a developing steel. At present, the market demand is mainly concentrated in automobile industry, compressor industry, machinery manufacturing industry, spare parts processing industry, fan industry, motorcycle industry, steel furniture, hardware accessories, electric cabinet shelves and various shapes of stamping parts. With the development of technology, hot-rolled pickling plate has been involved in household appliances, containers, electrical control cabinets and other industries, in which hot-rolled pickling plate instead of cold plate has developed rapidly in some industries 1. Hot-rolled pickled and oiled steel plate for automobile industry is a new steel type needed by automobile industry. Its good surface quality, thickness tolerance and processability can replace the body panels and automobile parts produced by cold-rolled plates in the past, thus reducing the raw material cost by about 10%. With the development of economy, the output of automobiles has also greatly increased, and the utilization rate of plates has also been continuously improved. Hot-rolled pickling plates are needed in the original design of parts in many domestic automobile industries, such as automobile subframe, wheel spokes, front and rear axle assemblies, truck box plates, protective nets, automobile beams, spare parts and so on. Due to the insufficient supply of hot-rolled pickling plates in China, cold plates or hot plates are generally replaced or pickled by themselves in automobile factories. 2. Agricultural Vehicle and Motorcycle Industry The agricultural vehicle manufacturing industry has developed rapidly in recent years, among which the agricultural vehicle industry in Shandong market has developed rapidly. The overall demand for hot and cold plates in the whole year is about 400,000 tons. In order to reduce the cost, many agricultural vehicle manufacturers are willing to use pickling plates instead of cold plates. The parts that can be "Geder cooled" are mainly the cab inner panel and windshield, and the required specifications are mainly 0.8- 1.5 × 100. The hub of motorcycle can also use pickling plate. At present, motorcycle wheels generally use 2.0mm cold plates. Due to the high cost and difficulty in purchasing thick cold plates, some manufacturers once switched to hot-rolled plates, but the surface quality of hot-rolled plates is poor, which is difficult to meet the needs of manufacturers. The use of pickling plate can meet the double requirements of users for cost and quality. 3. Hot-rolled pickling plates in machinery industry are mainly used in textile machinery, mining machinery, fans and some general machinery. Such as household refrigerators, compressor housings and upper and lower covers of air conditioners, pressure vessels and silencers of power compressors, and bases of screw air compressors. Among them, domestic refrigerators and air-conditioning compressors use pickling plates the most, which requires high deep drawing performance. The main materials are SPHC, SPHD, SPHE and SAPH370, with thicknesses ranging from 1.0-4.5mm, and the maximum demand specification is 2.0-3.5 mm Relevant data show that the hot-rolled pickling plates required for refrigerator compressors and air-conditioning compressors in the first half of this year are 80,000 tons and 65,438 respectively. At present, the fan industry mainly uses cold-rolled plates and hot-rolled plates. Hot-rolled pickling plate can replace cold plate to manufacture impeller, shell, flange, muffler, base and platform of fan and ventilator. 4. Other industries Other industries mainly include bicycle parts, various welded pipes, electrical cabinets, highway guardrails, supermarket shelves, warehouse shelves, fences, water heater liners, barrels, iron ladders and various shapes of stamping parts. With the continuous development of economy, spare parts processing has spread all over all walks of life, and processing plants have mushroomed rapidly, greatly increasing the demand for plates and the potential demand for hot-rolled pickled plates. Three. Market Prospect of Pickled Sheet Pickled sheet is an intermediate product with surface quality and application requirements (mainly cold forming or stamping performance) between hot-rolled sheet and cold-rolled sheet, and it is an ideal substitute for some hot-rolled sheets and cold-rolled sheets. Compared with hot-rolled sheet, the advantages of pickling sheet are: 1) good surface quality. Because the surface oxide scale of hot-rolled pickling plate is removed, the surface quality of steel is improved, which is convenient for welding, oiling and painting. 2) high dimensional accuracy. After flattening, the plate shape can be changed to some extent, thus reducing the unevenness deviation. 3) the surface smoothness is improved and the appearance effect is enhanced. 4) It can reduce the environmental pollution caused by users' dispersed pickling. Compared with cold-rolled sheet, the advantage of pickling sheet is that it can effectively reduce the purchase cost for users on the premise of ensuring the surface quality requirements. At present, many enterprises put forward higher and higher requirements for high performance and low cost of steel. With the continuous progress of steel rolling technology, the performance of hot-rolled sheet is approaching that of cold-rolled sheet, which makes "Geder cooling" technically realized. It can be said that pickling plate is a cost-effective product between cold-rolled plate and hot-rolled plate, and has a good market development prospect. However, at present, the use of pickling plate in domestic industries has just started, and the professional production of pickling plate began in September of 200 1 year. The pickling plate market is mainly reflected in the following four aspects: replacing cold rolling, replacing hot rolling, replacing imports and replacing small pickling. Among them, import substitution and small pickling are actually existing markets, and the market is limited, so it is impossible to completely replace them. With the rapid development of automobile, machinery, light industry and other industries, enterprises are facing huge market competition pressure, and the requirements for product cost and quality are increasing day by day. Pickled plate will completely replace some cold plates and hot plates with its high cost performance, and will be gradually recognized by users. More stages