Method for controlling defects of hemming part of high-carbon steel in hot rolling

The invention discloses a method for controlling defects of a hemming part of high-carbon steel in hot rolling, which belongs to the technical field of steel smelting and comprises the following steps: 1, carrying out conventional smelting and continuous casting to obtain a right-angle plate blank; 2, the plate blank is subjected to hot delivery and charged in a furnace within 8 hours, and the charging temperature is higher than or equal to 400 DEG C; 3, the plate blank is put into a heating furnace to be heated; 4, carrying out rough descaling after discharging, wherein the pressure is greater than or equal to 18MPa; 5, the four-roller reversible roughing mill adopts five or seven-pass rolling; 6, roughly rolling the body and descaling for the first pass, the third pass and the fifth pass; 7, width reduction is conducted through a large vertical roller, and the action passes are the first pass, the third pass and the fifth pass; 8, the thickness of a rough rolling intermediate billet is set to be 36-52 mm, a