Development and application of die-casting high speed steel rolls

Due to its high hardness, good red hardness and excellent wear resistance at high temperature, high speed steel (HSS) is fit for the roll manufacture. In order to overcome the segregation of centrifugal casting of HSS roll, die-cast processes were developed and its effects on the properties of the HSS roll were investigated. it was found that pressure, pressing time and speed are three important factors affecting shrinkage cavity. For pouring temperature of 1 400 - 1 450 degrees C, pressure of 150 - 160 MPa, pressing time of 120 - 150 s and Pressing speed of 14-16 mm/s, a compact HSS roll was obtained, Which has no segregation and small working allowance. In the high speed wire rod rolling mill, service life of the HSS roll is 5 to 8 times longer than that of high nickel chromium infinite chilled cast iron roll.