The mechanical properties of ASTM A514 steel plate are similar to that of Q690 in China. The hardness of A514 steel plate is 235-290, yield strength is more than 630Mpa and tensile strength is more than 700MPa. A709 grade 50S bridge steel plate, A514 Gr F steel plate is mostly used in places where high tensile strength and high yield strength are required, such as lifting gear of engineering vehicle, rack of large excavator and offshore platform.
Vanadium mainly exists in the form of carbide in A709 grade 50S bridge steel plate and so on steel. Its main function is to refine the structure and grain size of steel and reduce the strength and toughness of steel. When the solid solution is dissolved at high temperature, the hardenability is increased; conversely, if it is in the form of carbide, the hardenability is reduced. Vanadium increases the tempering stability of quenched steel and produces secondary hardening effect. The vanadium content in steel, except high speed tool steel, is generally less than 0.5%.
High-strength steel plates have the following characteristics. First, the strength is high, the bearing capacity is very good, and it is not easy to break. Second, compared with other steel plates under the same strength requirements, high-strength steel plates are lighter and thinner, which can effectively reduce the weight of structures. Third, the A709 grade 50S bridge steel plate, high-strength steel plates are required to be safe and reliable, able to withstand complete disasters such as water, fire, earthquake, storm, etc., to protect people's safety.
