Patent ID: 6344094
Filing Date: 2002-02-05
Classification: C21D,C22C

Abstract:
A papermaking suction roll shell member prepared from a hollow cylindrical body made of a ferritic-austenitic two-phase stainless steel consisting essentially of, in wt. %, over 0% to not more than 0.05% of C, 0.1 to 2.0% of Si, 0.1 to 2.0% of Mn, 20.0 to 23.0% of Cr, 3.0 to 3.9% of Ni, 0.5 to 1.4% of Mo, over 0% to not more than 2.0% of Cu, 0.05 to 0.2% of N and the balance substantially Fe, the Cr, Mo and N being within the range defined by the expression (i) given below, the metal structure of the stainless steel being 45 to 80% in the area ratio &agr;% of a ferritic phase therein, the Cr and N further being with the range defined by the expression (ii) given below, Cr+3.3Ã—Mo+16Ã—N&LessFullEqual;28&it;%(i)0.2Ã—(Cr/N)+25&LessFullEqual;Î±(ii)said papermaking suction roll shell member being obtained by centrifugal casting, by subjecting the body to solution treatment in a temperature range of 900 to 1100Â° C., and thereafter cooling the resulting body at a rate of 0.5 to 5Â° C./min.