Steel shell for a suction roll and a method of producing a steel product
AssigneeOutokumpu Oyj
InventorsMats LILJAS, Pelle JOHANSSON, Conny BERGKVIST
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Abstract
A suction roll shell having a plurality of through holes is made of a stainless ferrite-austenite steel having a micro-structure essentially consisting of 35-65% by volume of ferrite and 35-65% by volume of austenite. The steel has a composition containing, among other things, 0.005-0.07 C and 0.15-0.30 N, in % by weight.
Claims12
1-19. (canceled)
A suction roll shell with a plurality of drilled through holes, wherein the shell is formed of a plurality of segments united by circular joints and subjected to a working by turning and cutting in order to have through holes in the shell, and the shell is made of a stainless ferrite-austenite steel having a microstructure essentially consisting of 35-65% by volume of ferrite and 35-65% by volume of austenite, and having a chemical composition containing 0.005-0.07 C, 0.1-2.0 Si, 3-8 Mn, 19-23 Cr, 0.5-1.7 Ni, 0.15-0.30 N, in % by weight, and wherein the steel does not contain additives for improving cuttability.
Dependencies are inferred from the claim text.