The invention relates to a roll sleeve of an ultra-strong wear-resistant high
alloy steel roll squeezer and a manufacturing method of the roll sleeve, belonging to the technical field of
casting in
building material industry. The technical scheme is as follows: an outer layer adopts ultra-strong wear-resistant high
alloy steel, an inner layer is formed by compounding low-carbon medium
alloy steel, and the roll sleeve is manufactured through the process steps of melting the outer-layer ultra-strong wear-resistant high
alloy steel, melting the inner-layer low-carbon medium
alloy steel, centrifugally
casting the compound roll sleeve and performing heat treatment on the compound roll sleeve. The roll sleeve and the manufacturing method thereof, disclosed by the invention, have the positive effects that: the preferential mixture ratio of the inner-layer material to the outer-layer material of the roll sleeve is adopted and a reasonable centrifugal compound
casting process is adopted, thereby the inner layer and the outer layer are subjected to metallurgical bonding and a good bonding state is achieved. According to the characteristics of high alloy of the roll sleeve, the
fracture toughness of the roll sleeve is enhanced by raising
tempering temperature and performing multiple
tempering processes. The outer layer of the roll sleeve disclosed by the invention has the
hardness of 60-64HRC and the
impact toughness of 12J / cm<2>, the inner layer has the
hardness of 26-30HRC, the tensile strength of 800-900MPa and the yield strength of 730MPa, and the service life of the roll sleeve is prolonged by above 2 times in comparison with the traditional roll sleeve formed by
forging and overlaying
welding.