The invention provides a high crack-arresting
toughness steel plate with yield strength of 500MPa and a production method thereof. The chemical components of steel comprises the following components in percentage by weight: 0.04-0.08% of C, 0.10-0.5% of Si, 0.8-1.6% of Mn, not more than 0.02% of P, not more than 0.01% of S, 0.03-0.065% of Al, not more than 0.005% of N, 0.005-0.05% of Nb, 0.005-0.03% of Ti, 0.0005-0.003% of B, not more than 0.004% of Ca, and the balance of Fe and avoidless impurities. The preparation method comprises the steps of roughing in an
austenite re-crystalline region in a first stage, wherein the rolling temperature is 1000-1130 DEG C, the total
reduction rate in the re-crystalline region is greater than or equal to 50%; cooling a rolled steel plate quickly to 580-530 DEG C at a rate of 10 DEG C / s; rolling in a non-re-crystalline region in a second stage when the temperature of the surface of the steel plate is 720-770 DEG C, wherein the accumulated deformation is greater than or equal to 50%, the finish rolling temperature is 700-740 DEG C; and water-cooling after rolling, wherein the
cooling rate is 5-15 DEG C / s, and the final
cooling temperature is 460-560 DEG C. The high crack-arresting
toughness steel plate provided by the invention has the characteristics of high strength, high
toughness, inhibition of crack formation and expansion and the like, and meets the performance requirements of special part members of large container ships.