Forged steel and cast steel Hitachi crawler bottom rollers have high strength and are not prone to roll breakage, but their hardness is low, poor wear resistance, short service life, and frequent replacement of Hitachi crawler bottom rollers; because of the nodular cast iron Hitachi crawler bottom rollers There is graphite in the working layer of the body, which improves the wear resistance and thermal crack resistance of Hitachi crawler bottom rollers, which is better than forged steel and cast steel Hitachi crawler bottom rollers. Therefore, the rough and medium rolling mills are the premise of meeting the strength requirements. Next, medium nickel, chromium, molybdenum infinite chilled cast iron Hitachi crawler bottom rollers are selected.
The finishing mill train mainly requires the wear resistance of Hitachi crawler bottom rollers, so the medium nickel, chromium, molybdenum infinite chilled cast iron Hitachi crawler bottom rollers are selected, and the performance of the composite centrifugal roller is better than that in meeting the production technical requirements. Normal law roll. Therefore, the wire rod factory Hitachi crawler bottom rollers all use composite centrifugal rollers. In order to improve the wear resistance of the bottom roll of Hitachi crawler cranes, a certain proportion of alloying elements, such as medium nickel, chromium, and molybdenum, can also be appropriately added. Hitachi crawler bottom roller management refers to the selection of Hitachi crawler bottom roller material, the formulation of Hitachi crawler bottom roller procurement plan, the processing and management of Hitachi crawler bottom roller hole pattern template, the processing of Hitachi crawler bottom roller hole pattern and A series of tasks such as inspection, the determination of the amount of turning and the number of turning times of Hitachi crawler crane bottom rolls are systematic.
