Talking about the distribution of main application industries of hot rolled coil

　　Hot rolling


　　Hot rolled coil products have excellent functions such as high strength, good resistance, easy processing and excellent weldability, and are widely used in cold rolled substrates, ships, cars, bridges, construction, machinery, oil pipelines, pressure vessels, etc. industry.


　　(1), hot rolled coil deep processing industry


　　The hot-rolled coil deep processing is mainly applied to cold-rolled coil substrates, hot-rolled pickling plates and hot-rolled galvanized sheets, etc., and its application is mainly hot-rolled thin coils with thickness ≤3.0 mm.


　　The cold rolled coil substrate is one of the primary uses of the hot rolled coil. According to the incomplete calculation of the Steel House website, as of the end of 2013, China's cold rolled coil capacity is about 115 million tons, during which the cold rolled coil capacity of cold-rolled substrates is 58 million tons, mainly for domestic large and medium-sized steel enterprises. Cold rolling mills are mainly based on cold continuous rolling mills. The cold rolling capacity of the purchased purchased substrates is about 57 million tons. The cold rolling mills are mainly single-stand or double-stand cold rolling mills, which are mainly concentrated in North China and East China. The demand for hot rolled coils is mainly 1280-1300mm. (cold rolled product width is 1250mm) or 1030-1050mm (cold rolled product width is 1000mm), thickness is mainly 2.0-3.5mm; raw materials are generally SPHC (DD11, STW22), SPHD (DD13, STW23), SPHE (DD14, STW24) and Q195, Q235, SS300, SS400, ST37, etc.


　　After hot-rolled coils, the hot-rolled coils are mainly used for cold-rolled product coils, as well as deep-processed products such as coated sheets, color-coated sheets, and electrical steel. According to the calculation of the National Bureau of Computing, in 2013, the output value of China's cold-rolled products (including cold-rolled sheet, cold-rolled thin and wide steel strip, coated sheet, color-coated sheet, and electrical steel) was 117.876 million tons, an increase of 12.4% year-on-year.


　　The demand for hot-rolled pickling rolls will be concentrated in the car industry, compressor industry, machinery manufacturing industry, zero-match processing industry, wind turbine industry, motorcycle industry, steel furniture, hardware accessories, electric cabinet shelves and stamping parts of various shapes. . For example, the car industry needs hot-rolled pickling rolls for parts, such as car sub-frames, wheel spokes, front and rear axle assemblies, truck boxes, protective nets, car girders, etc.; China is the world's largest compressor production In the country, the compressor casing is now made of hot-rolled pickling rolls. The compressor casing has a high requirement for the plate type (same plate difference), and there is also a certain requirement for the color difference of the plate surface. SPHE is used as shell, SPHC, SPHD for upper and lower cover, etc., the thickness range is 1.0-4.5mm, and the standard is 2.0-3.5mm. The hot-rolled pickling plate used in machinery industry is mainly used for zero of mechanical equipment and fans. Parts; other zero-matching processing industries are mainly supermarket shelves, warehouse shelves, electrical cabinets, gates, bicycle parts and so on.


　　The substrate of the hot- rolled galvanized sheet is a hot-rolled coil , because the cold-rolling process is omitted, and the hot-dip galvanized sheet has a significant cost advantage, and has strong competitiveness in the shopping mall, and can partially replace the thick standard hot-dip plating. The demand for zinc sheets.


　　Hot-rolled galvanized sheet is mainly used in light steel structure houses and workshops in the steel structure industry. Its primary construction skeleton is galvanized cold-formed steel. The first is the production of C-shaped steel, Z-shaped steel, floor bearing plate and steel gutter. The standard is primarily 1.5-3.5mm. In addition, steel silos, highway guardrails and railway passenger cars are also the primary areas of hot-rolled galvanized sheet.


　　(2), structural steel


　　Structural steel is one of the most important uses of hot rolled coil. The primary use includes the construction of steel structures, machinery industry, cars, oil and gas and other industries.


　　In addition to the direct use of hot-rolled structural steel to form the steel structure, the construction industry also uses cold-rolled steel as the base material to make cold-formed steel and welded steel pipes. Cold-formed steel instead of steel has changed the single defect of the steel method and scale. Cold-formed steel products include cold-formed square tubes, rectangular tubes (square cold-formed steel, circular cold-formed steel, grooved cold-formed steel, angular cold-formed steel, square-stitched square, rectangular cold-formed steel, etc.).


　　Welded steel pipe includes straight seam electric welded steel pipe, spiral submerged arc welded steel pipe, car pipe, transformer pipe, double coiled steel pipe, welded steel pipe for low pressure fluid transportation, electric welded steel pipe for low and medium pressure boiler, welded steel pipe for heat exchanger, belt Electric welding steel pipe for roller conveyor, electric welded steel pipe for deep well water pump, electric welding steel pipe for mining fluid, general carbon steel wire casing, electric welded special steel pipe for steel window, electric welded steel pipe for transmission shaft, large diameter electric welding for low pressure fluid transportation Steel pipe blown oxygen welded pipe, metric welded pipe, spiral submerged arc welded steel pipe for oil and gas transportation pipeline, electric welded thin wall pipe, bellows, etc. These products are used in cars, container railways, elevators, chemicals, petroleum, refrigeration, food, machinery, nuclear power, textile machinery, vehicle and ship production, agricultural machinery, mining machinery, fitness equipment, construction, construction and renovation, Tonghua shutter, structural grid , municipal engineering, highway guardrails, road light poles, medical, supermarket shelves, light industrial furniture bath towel racks, lifting cool hangers, curtain rods, furniture, hotel equipment, leisure products and other industrial and civil industries.


　　(3), shipbuilding board


　　Shipbuilding boards are primarily used to make hulls, decks, etc. for ocean, coastal and inland navigation vessels. Because the ship's working environment is harsh, the ship's outer shell is subject to chemical corrosion of seawater, electrochemical corrosion and corrosion of marine organisms and microorganisms; the hull receives large wind shocks and alternating loads; the shape of the ship makes its processing methods messy, etc. Shipbuilding panels are demanding, and outstanding resistance is the most important requirement. In addition, high strength, outstanding corrosion resistance, welding function, forming function and surface quality are required. The steel mills that produce ship rolls in China include Taigang, Handan Iron and Steel, Anshan Iron and Steel, Benxi Steel, Maanshan Iron and Steel, and Wuhan Iron and Steel.


　　(4) Steel plate for pressure vessel


　　Pressure vessel steel plate requirements are higher, first of all, the container to be subjected to different pressure and strength, the general pressure is 31.4MPa or higher; the operating temperature is usually between -20 ° C ~ 450 ° C, there are also less than -20 °C. Depending on the working conditions and processing technology of the container, it is required that the steel sheet for the container has excellent cold bending and welding functions, excellent plasticity and resistance, high-temperature short-time strength or long-term strength. Pressure vessel steel plates are mainly used to make containers or other similar equipment in industries such as petroleum, chemical, power station, boiler, gas separation and storage, such as various tower containers, storage tanks, spherical tanks, oil and gas tanks, liquefied gas tanks, and liquefaction. Petroleum gas cylinders and tankers; boiler heat exchangers, reactors, boiler steam drums, heat exchangers, separators, high-pressure water pipes for hydropower stations, water wheel volutes, superheaters, main steam pipes and boiler fire chamber heating surfaces, etc. member.


　　(5) Steel for bridges


　　The construction of China's railways, especially high-speed railways, has been carried out rapidly. According to the latest data, in 2013, the national railway fixed assets investment was 663.8 billion yuan, and the new railway line was 5586 kilometers, during which the high-speed rail was 1672 kilometers. By the end of 2013, the national railway operation distance reached 103,000 kilometers, during which the high-speed rail operation distance was 11,000 kilometers, ranking first in the international list.


　　On August 19, 2013, the State Council issued the "Stipulations on Changing the Railway Investment and Financing System to Accelerate the Construction of Railways". It is said that in the face of the new situation and new requirements for railway development, it is necessary to consider the storage, pre-operation and construction of railway construction projects. Conditions such as strength and strength should accelerate the construction of the “Twelfth Five-Year Plan” and effectively build the organization for the next two years. According to the "Long-term Plan for China's Railways", by 2020, the construction speed of China's high-speed railways with a speed of 200 kilometers or more will exceed 18,000 kilometers, which will account for more than half of the total distance of international high-speed railways. The rapid construction of high-speed railways will bring huge demand for railway steel, and a large part of it will be attributed to steel for bridges.


　　(6), weather resistant, corrosion resistant structural steel


　　Hot-rolled steel strips resistant to atmospheric corrosion, sulfuric acid dew point corrosion and seawater corrosion, and transversely cut steel sheets and slitted longitudinal slit steel strips, primarily for the production of containers, railway vehicles, oil derricks, seaport construction, oil production channels And structural parts such as containers containing hydrogen sulfide corrosion medium in chemical petroleum equipment.


　　At present, most of the major shipbuilding enterprises have begun to shift the order points to offshore projects, including Dalian Shipbuilding Heavy Industry and China Shipping Engineering Company, all of which hold many offshore orders. The increase in offshore engineering will constitute a new demand for weather-resistant and corrosion-resistant structural steel. The offshore project consumes a large amount of steel. For example, a 150,000-ton FPSO (sea floating production and storage vessel) uses 30,000 tons of steel. The offshore oil pipeline uses 0.9 million tons of steel.


　　(7) Steel for oil and gas transportation pipelines


　　Steel for oil and gas pipelines is also the primary application of hot rolled coils, especially the increase in demand for pipeline steel driven by the West-East Gas Pipeline. The first line of the West-East Gas Pipeline Project was officially started in July 2002, and the entire line was completed and put into operation on October 1, 2004. The main line starts from the Lunnan oil and gas field in Tarim Oilfield, Xinjiang, and passes eastward through Korla, Turpan, Shanshan, Hami, Liuyuan, Jiuquan, Zhangye, Wuwei, Lanzhou, Dingxi, Xi'an, Luoyang, Xinyang, Hefei, Nanjing, Changzhou, etc. The city, east and west across 9 provinces and autonomous regions, with a total length of 4,200 kilometers, arrived in Baihe Town, Shanghai. It is the first international natural gas pipeline project planned and built by China, and is a landmark project for the development of the western region.


　　The second line of the West-East Gas Pipeline is the first strategic channel for China to introduce overseas natural gas resources. The gas source comes from Central Asia. The project has eight branches, a total length of 8704 kilometers, and an annual gas transmission capacity of 30 billion cubic meters. It starts from the Khorgos port in Xinjiang in the west, reaches Shanghai in the east, and reaches Guangzhou and Hong Kong in the south. The total investment is about 142.2 billion yuan. The west section of the Second West-East Gas Pipeline Project was completed and put into operation on December 31, 2009, and the second-line trunk line project of the West-East Gas Pipeline was completed and put into operation on June 30, 2011.


　　The West-East Gas Pipeline Project is another national key project following the Second West-East Gas Pipeline. The third line of the West-East Gas Pipeline Project consists of 1 dry 8 3 reservoirs 1LNG emergency peaking station. The trunk line passes through 10 provinces and autonomous regions in Xinjiang, Gansu, Ningxia, Shaanxi, Henan, Hubei, Hunan, Jiangxi, Fujian and Guangdong. The total length of the main line and branch line is 7,378 kilometers. The main line planning pressure is 12-10 MPa, the pipeline diameter is 1219 mm/1016 mm, and the planned transmission volume is 30 billion cubic meters/year. The third line of the West-East Gas Pipeline Project started on October 16, 2012, and the program was completed and put into operation in 2015.


　　The steel for oil and gas transportation pipelines has been developed from X52, X56 and X60 to X70 and X80. Now domestic Baosteel, Anshan Iron and Steel, Wuhan Iron and Steel, Handan Iron and Steel, Shougang, Taigang, Maanshan Iron and Steel, Shagang and Benxi Steel are all produced in batches. The talent of X80 pipeline steel pipe, and many of them are used in the West-East Gas Pipeline Project.


　　(7), steel for car structure


　　In recent years, China's car industry has developed rapidly. According to the data of the National Bureau of Computing, in 2013, the production and sales of China's cars were 22.16 million and 21.9841 million, an increase of 14.8% and 13.9% over the previous year, and an increase of 10.2 and 9.6 percentage points from 2012. . Both production and sales have broken 20 million pre-history highs, once again rewriting global records, and successively ranked first in the world for five consecutive years. In the steel for passenger cars, the amount of various steel plates including cold-rolled sheets and hot-rolled sheets accounts for more than 50% of steel for passenger cars. During this period, hot-rolled coils are mainly used for trucks and buses, and high-strength hot-rolled sheets are used. More and more extensive. Car girders are one of the first special steel types used in trucks. The primary standard is (4~16)mm×(1400～2000)mm; the tensile strength grade is 510MPa, some heavy-duty trucks have used products with strength of 590MPa. . Steel for wheels is also one of the primary steels for passenger cars. The steel used requires good strength, excellent welding function and forming function. Now it is widely used in China, including 330CL and 380CL, especially for 380CL. The grade can reduce the production cost, reduce the weight of the car body, reduce the energy consumption, and follow the rapid development of China's car industry. The demand for steel shopping malls for wheels is very large and has a broad prospect of shopping malls.