According to relevant national standards, the hardness of barite ore grinding plant large gear should reach hb300 or above, and the tooth surface hardness of pinion should also be hrc45 or above.However, some production units can not meet the above hardness requirements in actual production.This is needed to improve the hardness of barite ore grinding plant gears.In addition, in order to save equipment maintenance time, some miners have omitted the internal stress treatment process of the gear, which makes it difficult for the gear to meet the hardness requirements in actual production, and then reduces the wear resistance of barite ore grinding plant gear.