Quick normalizing heat treatment method for Q345R steel

The invention relates to a steel tempering process, in particular to a quick normalizing heat treatment method for Q345R steel, which comprises the following steps of: heating: making a steel plate enter a furnace with the temperature of 750 DEG C from a room temperature state, calculating the heating time according to unit thickness temperature equilibrium time of 0.8-1.1 min/mm, and segmentally heating to the target temperature of 910 DEG C, or uniformly setting temperature control areas of a scale-free roller-type heat treating furnace as 910 DEG C and making the steel plate directly enters the furnace with the temperature of 910 DEG C; keeping the temperature: after the steel plate is heated to 910 DEG C, and calculating the holding time according to unit thickness temperature equilibrium time of 0.8-0.9 min/mm for keeping the temperature; and cooling: cooling to room temperature. On the premise of ensuring that various properties meet requirements, the heating time and the holding time are shortened, the