Manufacturing method for Q345 series coil plates

The present invention relates to a manufacturing method for Q345 series coil plates. The method sequentially comprises the following steps: I, KR hot metal pretreatment, II, steelmaking through a converter, III, LF refining, IV, calcium line feeding, V, slab casting, VI, heating through a heating furnace, VII, hot rolling, VIII, cooling, and IX, coiling. The method is characterized in that after I KR hot metal pretreatment, II steelmaking through a converter, III LF refining and IV calcium line feeding are performed and LF smelting is completed, Mn content in the molten steel is 0.30-0.50% and Ti content in the molten steel is 0.025-0.045%; VII during a hot rolling process, a fine rolling finishing temperature is controlled to 850-880 DEG C; and VII during coiling, a coiling temperature is controlled to 560-610 DEG C. In addition, the manufacturing method has characteristics of low cost and good quality.