The selection principle of steel plate for high-rise building is: it can not only make the structure safe and reliable, but also can save steel and reduce the cost. Different use conditions should have different quality requirements. In terms of the mechanical properties of steel such as A514 grade T alloy steel plate, yield point, tensile strength, elongation, cold bending property, impact toughness etc. are the indicators to measure the quality of steel. In the design of steel structure, the appropriate steel should be selected according to the characteristics of the structure. The selection of steel is not only an economic problem, but also related to the safety and service life of the structure.
Since March 20, 2020, the export tax rebate rate of some steel products in China has been increased. According to statistics, the export volume of A514 grade T alloy steel plate and so on steel products within the adjustment scope in 2019 is 18.888 million tons, accounting for 29.4% of China's total steel exports; the export volume is 14.05 billion US dollars, accounting for 26.1% of the total steel exports. The adjustment will be conducive to the export of some steel products in China and reduce the purchase cost of foreign customers.
Grade Q420 steel has high strength, especially in the normalizing or normalizing and tempering state. A514 grade T alloy steel plate, Q420 steel has high comprehensive mechanical properties. Q420 steel is mainly used for large ships, bridges, power station equipment, medium and high pressure boilers, high pressure vessels, rolling stock, hoisting machinery, mining machinery and other large welded structural parts. Grade Q460 steel, with high strength, has high comprehensive mechanical properties in normalizing, normalizing and tempering or quenching and tempering states. The quality grades are C, D, E. Q460 steel is used in various large engineering structures and light structures requiring high strength and heavy load.
