Boron charging thick plate with low compression ratio, low alloy content and high strength and production method of boron charging thick plate

The invention discloses a boron charging thick plate with a low compression ratio, a low alloy content and high strength and a production method of the boron charging thick plate. The boron charging thick plate comprises the following chemical components in percentage by weight: 0.09-0.13% of C, 0.20-0.50% of Si, 1.30-1.50% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.003% of S, 0.015%-0.035% of Als, 0.02-0.05% of Nb, 0.0009-0.0014% of B, smaller than or equal to 0.005% of N and balance of Fe and inevitable impurities. The boron charging thick plate disclosed by the invention is produced by continuous cast blank, the production technology comprises the following steps: adopting desulfurized molten iron, continuously heating a casting blank in a pusher-type manner; immediately performing two-stage controlled rolling on a dephosphorized blank material; performing ACC(activated calcium carbonate) laminar flow cooling on a steel plate finally rolled, and performing normalizing treatment on the steel plate of which the thickness is 60-100mm cooled to a room temperature. According to the boron charging thick plate disclosed by the invention, Nb microalloying treatment is only taken, the two-stage controlled rolling is performed on the continuous cast blank, through the deformation in a recrystallization region, the refining effect of an austenite recrystallized grain is obvious, acquisition of tiny tissues is facilitated, the microalloy Nb and B elements are fully diffused, and the aggregation of the B element is reduced; quick cooling is performed after the rolling, so that the grain growth and the generation of a boron phase can be effectively restrained.