Ladderlike bainite-martensite duplex-phase steel abrasion-resistant roller sleeve and preparation method thereof

The invention discloses a ladderlike bainite-martensite duplex-phase steel abrasion-resistant roller sleeve and a preparation method thereof, and belongs to the technical field of metal material casting. According to the method, silicomanganese series casting alloy steel with different compositions is prepared through centrifugal pressure casting in a layered mode, an outer layer (1) is a high-hardness abrasion-resistant layer, an inner layer (2) is a ductile matrix layer, and ladderlike bainite-martensite duplex-phase structures are obtained through the inner layer and the outer layer after salt bath isothermal quenching heat treatment, so that different properties are obtained. According to the method, the material composition proportion of the inner layer and the outer layer is optimized, a reasonable centrifugal compound casting process is adopted, and the inner layer and the outer layer are made to obtain the ladderlike bainite-martensite duplex-phase structures with different contents through the simple isothermal quenching heat treatment mode. According to the roller sleeve, the hardness of the outer layer is 57-62 HRC, the impact toughness of the outer layer is 10-13 J/cm , the hardness of the inner layer is 50-55 HRC, the impact toughness of the inner layer is 19-21 J/cm , and the high-quality abrasion-resistant roller sleeve with the high abrasion resistance, good toughness and the low cost is obtained.