On-line quenching production method of low-cost high-strength abrasion-resistant steel plate

The invention relates to an on-line quenching production method of a low-cost high-strength abrasion-resistant steel plate, and belongs to the technical field of the production of abrasion-resistant steels. The on-line quenching production method comprises the following processing steps of: selecting a continuous casting blank which meets the requirements; carrying out general hot rolling, wherein the heating temperature is 1170-1200 DEG C, the start rolling temperature is 1050-1100 DEG C, the finish rolling temperature is 900-950 DEG C, and the water entry temperature is more than 880 DEG C; realizing the on-line quenching of the steel plate by utilizing a UFC+ACC cooling mode, wherein the average speed of a cooling zone is not lower than 25 DEG C/S, and the quenching is finished when the temperature is reduced to 150-250 DEG C; and heating the quenched steel plate to 250-400 DEG C, wherein the heat preserving time is 1-2 hours. The on-line quenching production method disclosed by the invention overcomes the defects of long period, high cost, and the like of the conventional hardening and tempering heat treatment production mode, realizes the short production flow, the low energy consumption and the low cost, can be used for stably producing high-strength high-toughness abrasion-resistant steel plate with the specification of 6-30 mm, the surface hardness more than or equal to HB360 and the -20 DEG C impact work mean more than or equal to 60 J and is widely applied to mine, engineering, agriculture and railway transportation machinery products which have high requirements for steel type properties.