Abstract There are provided a flux of a novel composition adapted for use in a centrifugal casting process for the production of a composite roll and the process comprising the step of adding the flux at a specific stage thereof. This flux contains, in weight percent, from 5 to 20% a metallic element such as aluminum which causes an exothermic reaction with the melt when in contact, thus aiding in the heat generating on the innermost surface of the melt to define the shell portion of the roll during the casting. This improves the characteristic of the temperature distribution gradient over its cross-section taken radially of the shell portion of the roll, thereby precluding the cause of the formation of cracks or other defects which tend to appear in the form of a circumferential layer in the formed roll but at a position close to its outermost surface in its cross-section.
A FLUX COMPOSITION ADAPTED FOR USE IN THE CENTRIFUGAL CASTING OF A COMPOSITE ROLL FROM A METAL MELT, SAID COMPOSITE ROLL HAVING A CORE PORTION AND A SHELL PORTION DIRECTLY BONDED TO SAID CORE PORTION, SAID FLUX CONSISTING ESSENTIALLY OF, IN WEIGHT PERCENT OF THE TOTAL, FROM 5 TO 20% OF A METALLIC ELEMENT SELECTED FROM ALUMINUM, SILICON AND MAGNESIUM, FROM 30 TO 45% OF A MIXTURE OF BORAX AND SILICA SAND AND FROM 65 TO 35%OF A FLUIDIZING AGENT SELECTED FROM SODIUM COMPOUNDS, FLUORIDES AND MIXTURES THEREOF.
Claim 2
Dependent Claim
88 words
A FLUX COMPOSITION ADAPTED FOR USE IN THE CENTRIFUGAL CASTING OF A COMPOSITE ROLL FROM A METAL MELT, SAID COMPOSITE ROLL HAVING A CORE PORTION AND A SHELL PORTION DIRECTLY BONDED TO SAID CORE PORTION, SAID FLUX CONSISTING ESSENTIALLY OF, IN WEIGHT PERCENT OF THE TOTAL, FROM 5 TO 20% OF A METALLIC ELEMENT SELECTED FROM ALUMINUM, SILICON AND MAGNESIUM, FROM 30 TO 45% OF A MIXTURE OF BORAX AND SILICA SAND AND FROM 65 TO 35%OF A FLUIDIZING AGENT SELECTED FROM SODIUM COMPOUNDS, FLUORIDES AND MIXTURES THEREOF.