Hot roll specifications are: 2.75*1500*C, 3.0*1500*C, 3.25*1500*C, 3.5*1500*C, 3.75*1500*C, 4.25*1500*C, 4.5*1500*C, 4.75*1500 *C、5.25*1500*C、5.5*1500*C、5.75*1500*C、6.5*1500*C、7.25*1500C、7.5*1500*C、7.75*1500*C、9.25*1500*C、9.5 *1500*C, 9.75*1500*C, 11.25*1500*C, 11.5*1500*C, 11.75*1500*C… Medium and thick plate specifications:
(1) Medium-thick plate: Steel plate is a kind of flat steel with a large width-to-thickness ratio and surface area. According to thickness, they are thin steel plates (thickness <= 4 mm) and thick steel plates (thickness > 4 mm). In actual work, steel plates with thickness <= 20 mm are often called medium plates, and steel plates with thickness > 20-60 mm are called medium plates. It is a thick plate. Steel plates with a thickness >60 mm are called extra-thick plates and are collectively called medium-thick steel plates. Steel plates with relatively small width and very long length are called steel strips and are listed as an independent variety. Steel plates have great covering and containment capabilities and can be used as roofing panels, roofing materials, and manufacturing containers, oil storage tanks, packaging boxes, train carriages, automobile grille, industrial furnace casings, etc.: they can be cut and customized according to usage requirements. Combined, it can be made into various structural parts and mechanical parts, and can also be made into welded steel, further expanding the scope of use of steel plates; it can be bent and stamped into boilers, containers, stamped automobile shells, civil utensils, appliances, etc. It can be used as blank for welded steel pipes and cold-formed steel. Steel plates are supplied in sheets or rolls. The specifications of the sheet steel plate are expressed in millimeters of thickness * width * length. Being familiar with the specifications of plates and strips and making full use of the width and length is of great significance to improving material utilization, reducing inappropriate leftover materials, and reducing working hours and product costs. Common medium plate, low alloy plate, container plate, boiler plate, bridge plate, ship plate. Note: These types of plates all come from medium and heavy plate rolling mills. They are only distinguished by the different materials added in steelmaking. Their appearance, thickness and specifications are basically the same. The general thickness is 6-120mm, of which 6 mm, 8 The prices of mm, 10 mm, and 12mm medium-thick plates are decreasing successively, and the price of 6mm medium-thick plates is the most expensive among them; 14-30mm is a common specification, and the price is at the same level; 32-49mm belongs to the thick plate series, and the price is at the same level. The price is slightly more expensive than commonly used boards; 50-120mm belongs to the ultra-thick board series, the price of 50-90mm boards is at the same level, and the price of boards with specifications above 90mm will increase as the thickness increases. The representative specification of medium-thick plate is 20mm.
a. Hot rolled coils: Hot rolling uses slabs (mainly continuous casting billets) as raw materials. After heating, they are made into steel strips by rough rolling units and finishing rolling units. The hot steel strip coming out of the last rolling mill of finishing rolling is cooled to the set temperature through laminar flow, and is rolled into steel strip coils by the coiler. The cooled steel strip coils undergo different finishing operations according to the different needs of users. Lines (smoothing, straightening, cross-cutting or slitting, inspection, weighing, packaging and marking, etc.) are processed into steel plates, flat coils and slit steel strip products. To put it simply, a piece of steel billet is heated (it is the red-hot steel block on TV) and rolled through several passes, then trimmed and straightened into a steel plate. This is called hot rolling. The thickness of hot-rolled coils (in the form of flat sheets or coils) is generally between 2.0-13.5mm, of which the price of 2.0-3.0mm hot coils gradually decreases from thin to thick; the prices of 3.1mm-13.5mm in most steel mills are basically Quite, the price of 3.1-4.0mm and 9.5mm-13.5mm hot plate rolls from some manufacturers and markets may be higher than the price of 4.0mm-9.5mm plates. Hot plate rolls represent products with a thickness of 5.5mm. Under normal circumstances, the price of flat plates is slightly higher. Higher than the price of coiled plates.
b. Cold-rolled coils: Hot-rolled steel coils are used as raw materials, and the oxide scale is removed by pickling and then cold-rolled continuously. The finished product is hard-rolled coils. Due to the cold work hardening caused by continuous cold deformation, the strength and strength of the hard-rolled coils are reduced. The hardness increases and the toughness and plasticity index decrease, so the stamping performance will deteriorate and it can only be used for parts with simple deformation. Hard rolled coils can be used as raw materials in hot-dip galvanizing plants because hot-dip galvanizing units are equipped with annealing lines. The weight of hard-rolled coils is generally 6 to 13.5 tons. The steel coils are continuously rolled at room temperature by hot-rolled pickled coils with an inner diameter of 610mm. Cold rolling is processed and rolled on the basis of hot rolled coils. Generally speaking, it is a process of hot rolling–pickling–cold rolling. Cold rolling is made from hot-rolled plates at room temperature. Although rolling will also heat up the steel plate during the processing, it is still called cold rolling. The thickness of cold-rolled coils (in the form of flat sheets or coils) is generally between 0.2mm-3.0mm, of which 0.2mm-1mm (excluding 1.0mm). The product price gradually decreases from thin to thick, 1.0mm-2.0mm The product prices are basically the same. The price of cold plate coils larger than 2.0mm and less than or equal to 3.0mm is slightly higher than the price of cold plate coils with a pitch of 1.0mm-2.0mm. The representative specification of cold-rolled coils is 1.0mm. Under normal circumstances, the price of flat plates is slightly higher. The price of coiled plates.
c. Galvanized steel sheet: In order to prevent corrosion on the surface of the steel sheet and extend its service life, the galvanized steel sheet is coated with a layer of metallic zinc on the surface. This zinc-coated thin sheet metal automotive is called a galvanized sheet. It can be divided into the following categories according to production and processing methods:
①Hot-dip galvanized steel plate. A thin steel plate is immersed in a molten zinc bath so that a layer of zinc adheres to its surface. At present, the continuous galvanizing process is mainly used for production, that is, the rolled steel plates are continuously immersed in a plating bath containing molten zinc to make galvanized steel plates;
②Alloyed galvanized steel sheet. This kind of steel plate is also made by the hot dip method, but it is heated to about 500°C immediately after coming out of the tank to form an alloy film of zinc and iron. This kind of galvanized sheet has good paint adhesion and weldability;
③Electro-galvanized steel plate. This kind of galvanized steel sheet manufactured by electroplating method has good processability. However, the coating is thin and its corrosion resistance is not as good as that of hot-dip galvanized sheets;
④ Single-sided galvanized steel plate and double-sided galvanized steel plate. Single-sided galvanized sheet metal steel is a product that is galvanized on only one side. In terms of welding, painting, anti-rust treatment, processing, etc., it has better adaptability than double-sided galvanized sheets. In order to overcome the shortcomings of one side not being coated with zinc, there is another type of galvanized sheet that is coated with a thin layer of zinc on the other side, that is, double-sided galvanized sheet;
⑤Alloy, composite galvanized steel plate. It is made of zinc and other metals such as lead, zinc alloy or even composite plated steel plate. This kind of steel plate has both excellent anti-rust properties and good painting properties. In addition to the above five types, there are also colored galvanized steel sheets, printed and painted galvanized steel sheets, PVC laminated galvanized steel sheets, etc. But currently the most commonly used is still hot-dip galvanized sheet. According to the use, galvanized steel sheets can be divided into galvanized steel sheets for general use, roof use, building exterior panels, structural use, tile ridge board use, drawing use and deep drawing use. Galvanized sheet metal: The general specification is 0.3mm-2.0mm, and its price gradually decreases from thin to thick. The representative specification of galvanized sheet coil is 1.0mm.
d. Color-coated coils: Generally, color-coated substrates are hot-dip galvanized and galvanized. It is to spray paint on hot-dip galvanized sheets and galvanized sheets. After several sprays and baking, the color-coated sheets are processed! ! The substrates of color-coated boards can be divided into cold-rolled substrates, hot-dip galvanized substrates, and electro-galvanized substrates. The coating types of color-coated boards can be divided into: polyester, silicon-modified polyester, polyvinylidene fluoride, and plastisol. The colors of color-coated boards can be divided into many types according to user requirements, such as orange, cream, deep sky blue, sea blue, crimson, brick red, ivory, porcelain blue, etc. The surface state of color-coated boards can be divided into coated boards, embossed boards, and printed boards. The market uses of color-coated boards are mainly divided into three parts: construction, home appliances and transportation. Among them, the construction field accounts for the largest proportion, followed by the home appliance industry, and the transportation industry only accounts for a smaller part. Color-coated sheets for construction generally use hot-dip galvanized steel sheets and hot-dip galvalume steel sheets as base plates. They are mainly processed into corrugated sheets or polyester composite sandwich panels and are used in the construction of steel structure factories, airports, warehouses, freezers and other industries. and roofs, walls, and doors of commercial buildings. Home appliance color plates generally use electro-galvanized and cold plates as substrates, and are used to produce refrigerators and large air-conditioning systems, freezers, toasters, furniture, etc. In the transportation industry, electro-galvanized and cold plates are generally used as substrates, mainly used for oil pans, automotive interior parts, etc. Color-coated board: The general specification is 0.25 mm -0.7mm, and its price gradually decreases from thin to thick. The representative specification of color-coated board roll is 0.47mm.