High-strength steel plate with high anti-tempering stability produced by TMCP (Thermal Mechanical Control Processing) process and manufacturing method of high-strength steel plate

The invention relates to a high-strength steel plate with high tempering resistance stability produced by a TMCP process and a manufacturing method of the high-strength steel plate. The microstructure of the steel plate is acicular ferrite, polygonal ferrite and a fine and dispersively distributed MA structure. The steel plate comprises the following element components in percentage by mass: 0.06-0.10% of C, 0.20-0.40% of Si, 1.50-1.70% of Mn, 0.02-0.04% of Al, 0.02-0.05% of Nb, 0.10-0.50% of Cr, 0.20-0.50% of Ni, 0.15-0.40% of Mo, 0.01-0.02% of Ti, less than or equal to 0.30% of Cu, less than or equal to 0.20% of Pcm and the balance of Fe and inevitable impurities. A high-temperature tempering test proves that the microstructure type can ensure that the steel plate has good high-temperature tempering stability and low-temperature toughness, the technical bottleneck of poor high-temperature tempering stability of the high-strength steel plate produced by the conventional TMCP process is broken through, and th