Steel plate for large-thickness Q500GJE high-strength building structure and manufacturing method of steel plate

The invention relates to a steel plate for a large-thickness Q500GJE high-strength building structure. The steel plate comprises the chemical components of, by mass, 0.07-0.14% of C, 0.20-0.50% of Si, 1.2-1.60% of Mn, less than or equal to 0.008% of P, less than or equal to 0.005% of S, 0.10-0.30% of Cr, less than or equal to 0.30% of Mo, 0.20-0.30% of Ni, less than or equal to 0.30% of Cu, 0.02-0.04% of Al, 0.020-0.060% of Nb, 0.01-0.02% of Ti, less than or equal to 0.22% of V + Nb + Ti, less than or equal to 0.007% of N and unavoidable impurity elements. The carbon equivalent is 0.36-0.46%. The technological process comprises the steps of molten iron pretreatment, converter smelting, LF refining, RH furnace refining, blank casting through a continuous casting machine, blank heating, rolling mill controlled rolling, Acc cooling and finishing. According to the steel plate for the large-thickness Q500GJE high-strength building structure, the performance of a steel product of the building structure is even, the