Steel production method for eliminating magnetic mark defect of large-specification crankshaft

The invention relates to the technical field of special steel smelting and processing, and discloses a steel production method for eliminating large-specification crankshaft magnetic mark defects, which comprises the following steps: (1) casting blank smelting and continuous casting technology; and (2) a continuous casting bloom rolling production technology. According to the method, the core quality of the continuous casting billet can be improved, and the central shrinkage cavity of the continuous casting billet is reduced from the conventional grade 1 to grade 0; and the equiaxed crystal rate and the length-width ratio of the steel are reduced. The steel produced through the method has the advantages of being low in isometric crystal size and isometric crystal length-width ratio, after a crankshaft is machined through large-deformation forging, no serious magnetic mark defect exists in the magnetic powder inspection process, the proportion of the magnetic mark defect (slight magnetic mark) is smaller than