Production method of high-toughness high-Z-direction-performance extra-thick steel Q460GJ with compression ratio smaller than or equal to 4

The invention belongs to the technical field of wide and thick plate metallurgy, and particularly relates to a production method of high-toughness high-Z-direction-performance extra-thick steel Q460GJ with the compression ratio smaller than or equal to 4. The thickness of a steel plate ranges from 80 mm to 100 mm, and the steel plate comprises, by mass, 0.1%-0.13% of C, 0.1%-0.3% of Si, 1.1%-1.3% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.003% of S, 0.3%-0.5% of Cr, 0.01%-0.02% of Ti, 0.01%-0.02% of Nb, 0.1%-0.3% of Ni, 0.06%-0.07% of V, 0.025%-0.035% of Als and the balance Fe and residual elements. The Q460GJ steel is reasonable in chemical component design, clean molten steel is obtained through clean steel smelting and inclusion Ca treatment, continuous casting production is adopted, a reasonable controlled rolling and controlled cooling process is matched, a traditional heat treatment link is omitted, the Q460GJ steel with the compression ratio smaller than or equal to 4 and t