Production method of steel for commercial vehicle gear

The invention relates to a production method of steel for a commercial vehicle gear, which comprises the steps of converter smelting, LF furnace refining, RH vacuum treatment, continuous casting, controlled rolling and slow cooling, Mn, Cr and Mo elements are added to improve the hardenability and strength, S is added to improve the cutting performance of a workpiece, a proper amount of Al and N are added to refine grains, and the content of P is reduced to improve the toughness of a material. H removal control is enhanced in the smelting process, and the superheat degree, the pulling speed and tail end electromagnetic stirring parameters are reasonably optimized in the continuous casting process to reduce casting blank macroscopic defects. The produced steel is suitable for manufacturing large-specification commercial gears with the round steel diameter of 120-160 mm, and has the advantages that the content of non-metallic inclusions is low, the total oxygen content is smaller than or equal to 0.0010%, the g