PREPARATION METHOD FOR HIGH-CARBON WEAR-RESISTANT STEEL BALL

摘要

Disclosed is a preparation method for a high-carbon wear-resistant steel ball. The preparation method comprises the following steps: (a) pressing and rolling a high-carbon round steel section into a spherical shape to obtain a steel ball; (b) performing air cooling on the steel ball to cool same to 480-520ºC, and then naturally cooling same; (c) putting the cold steel ball into a heating furnace for secondary heating, and discharging same from the furnace, wherein the heating furnace is provided with a first heating area, a second heating area, a third heating area and a cooling area; (d) after the temperature of the steel ball, which has been discharged from the furnace, is reduced to 790-820ºC, putting the steel ball into water for quenching, and removing the steel ball from the water after the steel ball is cooled to be reduced to the temperature of 150-170ºC; and (e) after the steel ball, which has been removed from the water, is continuously cooled to 58-60ºC, performing low-temperature continuous tempering on the steel ball at 200-240ºC, and naturally cooling same. In the present invention, a secondary heating technique is used, the lower austenitizing temperature of the steel ball is controlled to refine the structure of the steel ball, and preparation is provided for steel ball quenching; and the quenching temperature, the temperature of the steel ball when being removed from the water, and the cooling and tempering process after the steel ball is removed from the water are controlled, such that the problem of the steel ball being prone to cracking due to direct quenching is effectively solved, and a new method is provided for the batch production of high-carbon wear-resistant steel balls.