Thick-gauge high-toughness hot-rolled strip steel with yield strength of 600MPa and production method of thick-gauge high-toughness hot-rolled strip steel

The invention relates to the technical field of metallurgy, in particular to thick-specification high-toughness hot-rolled strip steel with yield strength of 600MPa and a production method thereof, and the thick-specification high-toughness hot-rolled strip steel comprises the following chemical components in percentage by mass: 0.07%-0.10% of C, 0.15%-0.30% of Si, 1.60%-1.75% of Mn, less than or equal to 0.018% of P, less than or equal to 0.0040% of S, 0.055%-0.070% of Ti, 0.050%-0.065% of Nb, 0.10%-0.20% of Cr, 0.020%-0.050% of Al, less than or equal to 0.0040% of N and the balance of Fe and inevitable impurities. According to the production method, low-carbon, medium-manganese, titanium-niobium composite microalloying, component design of a proper amount of chromium and proper component proportion are adopted, a clean steel smelting-continuous casting process and a proper controlled rolling and controlled cooling process are combined, the thick 600MPa-grade hot-rolled strip steel is produced, the low-tempe