460MPa-grade high-performance steel for bridge U rib and production method of 460MPa-grade high-performance steel

The invention particularly relates to 460MPa-grade high-performance steel for a bridge U rib and a production method of the 460MPa-grade high-performance steel, and belongs to the technical field of steel preparation. By controlling the carbon content (0.07-0.09), it is guaranteed that a steel plate has good low-temperature toughness and weldability, meanwhile, the enough carbon element strengthening effect is guaranteed, alloy addition is reduced, and the cost is reduced; strong water cooling is not needed to guarantee steel plate strength, narrow strength fluctuation is achieved, and steel plate stress is reduced. Through Nb and Ti microalloying, growth of original austenite grains in the heating process is inhibited, the grains are refined, the toughness is improved, and the strength is guaranteed. And more Cr elements are added, so that the hardenability of the steel plate is improved, the MA structure is refined, and the tensile strength of the steel plate is improved. By adding a small amount of Ni, the