Steering Ball
The Ball pins made of 50Cr have all been through carburizing, quenching and tempering according to the technical process of heat treatment, quenching temperature is 830 ~ 850℃, tempering temperature is 180 ~ 200℃, water is the quenching cooling medium, with temperature 20 ~ 40℃, quenching water Pressure is 0.2 ~ 0.8Mpa, the pit furnace is used for tempering of which temperature is 180 degrees, quenching depth is 2-4.5mm, spherical hardness is HRC-56-53, the hardness of other quenched surface is not less than HRC50. The steering head rod made of 40Cr steel is through quenching and tempering to maintain the tensile strength of the blank in the range of 880N/mm2 to 890N/mm2; then formed by cold extrusion. The adoption of cold extrusion process ensure the comprehensive performance of the integrated part comply with requirement. Compared with hot forging process, cold extrusion process reduces raw material consumption by 21.6%; meanwhile it simplifies production process, saves energy and reduces production cost by 15%
