Patent ID: 6110084
Filing Date: 2000-08-29
Classification: B22F,B32B

Abstract:
A combined roll, comprising:an external ring portion, andan internal ring portion bonded to said external ring portion, whereinsaid external ring portion is formed from a cemented tungsten carbide comprising, by weight percentage,Co: 5-27%, Ni: 2-12% and Cr: 0.3-3%, andtungsten carbide as substantially all of the balance, and whereinsaid internal ring portion is formed from a ductile iron comprising, by weight percentage,C: 3-4.5%, Si: 1.5-4.5%, Mn: 0.1-2% and Mg: 0.02-0.2%, andFe and incidental impurities as the balance, andwherein said internal ring portion comprises a cored spheroidal graphite structure dispersed in a mixed phase comprising a ferrite phase and a phase selected from the group consisting of a perlite phase, a beinite phase and a martensite phase, said cored spheroidal graphite structure comprising a spheroidal graphite core and graphite peripherally deposited around said core.