Bimetallic Cast Iron Rolls – Some Approaches to Assure the Exploitation Properties

Although the manufacture of rolls is in constant improvement, the requirements for superior quality rolls have not yet been completely satisfied, in many cases the absence of quality rolls preventing the realization of quality laminates or of productivity of which rolling mills are capable. In the selection of materials several factors have to be considered including the type of rolling mill, the size of rolls (of specially this diameter), the speeds of lamination, the stands from the train of lamination for which the rolls are achieved, the working temperature in the lamination process, the module of cooling during work, the size caliber, the pressure on rolls, the rolled material hardness, etc. The choice of material for rolls is the operation which takes into consideration the own solicitations of the lamination process afferent to the type of laminates (halfproduct or the finite laminate), and the features of different materials considered optimal in the fabrication of different typo-dimensions of rolls. The large diversity of the laminated products and the