The trend of steel reduction is to increase the strength of steel and reduce the market trend of steel reduction in downstream industries. Under the "low carbon" pressure, the steel standard will increase, and the "reduction" steel will become a trend. The steel industries such as construction, automobiles, home appliances, containers, and construction machinery have all proposed the reduction requirements for steels with high strength, corrosion resistance, light weight, long life, and recyclability for the use of steel in the “12th Five-Year Planâ€. Will affect the increase in the number of steel, affecting the quality of steel. Reinforced concrete buildings require steel of higher strength. Among the 130 million tons of building steel bars, 60% are Grade I steels and Grade II steel bars with a yield strength of less than 335 MPa. The promotion of hot rolled steel bars larger than 400 MPa can reduce the consumption of steel bars by about 10 million tons. From July 1st, 2011, the implementation of GB50010-2010 "Concrete Structure Design Code" requires the use of 400MPa grade steel bars, the promotion of 500MPa grade steel bars, the replacement of HPB235 light round bars with HPB300 light round bars, and the gradual reduction of the use of 335MPa grade steel bars and finally Cancel the variety. The proportion of high-strength steel plates used in automobiles will be further increased. At present, the strength of automobile steel sheets has been increased from the previous 200 to 300 MPa class to the strength of 500 to 1000 MPa, which has greatly improved the strength level of automotive steel. The proportion of ultra-high-strength steel with a strength higher than 590 MPa in the future will be further improved and will gradually be in line with international standards. Container steel tends to be lighter and thinner, and it also increases the container's effective floor area ratio while reducing weight. The proportion of thin sheets for containers will increase significantly. In addition, in order to meet the needs of different cargo transportation, special containers such as insulated containers, tank containers, gantry containers and animal containers have emerged and developed rapidly. These changes in demand have raised the material and corrosion resistance of steel. The demand for duplex stainless steel and low temperature (-60 ° C) low alloy structural steel is increasing. The new feature of steel for home appliances is that household appliances are becoming lighter, more aesthetic, and more energy efficient. With the upgrading of home appliances, the proportion of new functional steel plates, such as coated steel plates, stainless steel plates, galvanized sheets, wide sheets, etc., with high surface requirements, such as antibacterial and heat dissipation, has increased. Demand for electrical steel, high-strength steel, hot-rolled pickling, and environmentally-friendly steel sheets has increased rapidly. The comprehensive performance requirements of steel—wear resistance, impact resistance, fatigue resistance, low temperature toughness, corrosion resistance, corrosion resistance, weathering steel will be more used. Compared with ordinary carbon steel, corrosion resistance and weathering steel have improved corrosion resistance by 2 to 8 times, thus have the advantages of long life, resource saving and energy consumption reduction. They are widely used in containers, railway rolling stock, bridge construction, and ocean. Engineering and petrochemical equipment industries. At present, the development of high-rise buildings and steel structures, the construction of cross-sea bridges, the development of offshore oil platform equipment and the development of supercritical and ultra-supercritical thermal power generating units, and the industrial upgrading of the petrochemical industry require corrosion-resistant and weather-resistant steels. Continuous improving. During the “Twelfth Five-Year Plan†period, research and development and production of high-performance, low-cost weather-resistant and corrosion-resistant steel, opening up new application areas and expanding usage will become one of the main tasks of structural optimization of the steel industry. In addition to the use of weather-resistant steel and corrosion-resistant steel in the traditional container, railway rolling stock and bridge construction industries, some new areas have begun to adopt weather-resistant and corrosion-resistant steel, such as the shipbuilding industry. For special requirements engineering machinery boards, in addition to general strength, stiffness and welding performance, some engineering machinery boards should also have wear resistance, impact resistance, fatigue resistance, low temperature toughness, corrosion resistance, special requirements engineering machinery board. It is a key species for future development. Building – the new requirements for the production and use of steel for steel structures. From the safety and sex analysis, high toughness and low yield ratio are required. From the viewpoint of improving the workability, it is required to reduce the carbon equivalent and the crack sensitivity coefficient, and at the same time, it has a certain ability to resist laminar tearing. From the standpoint of durability and safety, corrosion resistance, weather resistance, fire resistance and shock resistance are required. Ships - New requirements for steel in green environmental protection. Nippon Steel and Japan __Ship Co., Ltd. cooperated in the world to develop a high-corrosion-resistant thick steel plate on the bottom of the tanker oil tank and put it into practical use. This is a steel plate developed to prevent corrosion of the bottom of the oil tank for oil spills. It is a steel plate that improves the safety of the ship and protects the global environment. The corrosion resistance of the steel plate is about five times that of ordinary thick steel plates, and it is not necessary to carry out anti-corrosion coating. Therefore, it is not necessary to use paints and organic solvents to make the ship an environmentally friendly ship. Oil – the new requirements for steel in harsh geological conditions and new processes. High-end products with outstanding development: X80 steel grade welded pipe with better performance, X90 and higher steel grade welded pipe, high strength steel pipe satisfying -45 °C low temperature toughness requirement, anti-large deformation pipeline steel and welded pipe, deep sea oil and gas pipeline steel pipe, acid service Steel pipes, etc. Steel for bridges - high performance steel. Compared with the past, from the perspective of further improving the strength, fracture toughness, weldability, corrosion resistance and processing properties required for bridge steel, the properties are improved to the optimum range. This is the "high performance steel BHS". ". Machinery - the requirements of steel products for product upgrades. In the traditional equipment manufacturing industry, steel for engineering machinery is developed to high-strength, high-wear, special-performance steel; wind power equipment should improve the life of bearing steel, which requires improving the purity of bearing steel (reducing inclusions); Forgings should solve the machining capacity and heat treatment level; general mechanical steel should be developed to free cutting steel, non-tempered steel, silver bright steel and other varieties.
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