F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 9/18 (2006.01) B32B 1/08 (2006.01) B32B 15/01 (2006.01) C21D 10/00 (2006.01) C22C 38/40 (2006.01) C23F 11/00 (2006.01) F16L 57/02 (2006.01) F16L 58/08 (2006.01)
Patent
CA 2566370
An austenitic Ni-Cr-Fe alloy is provided as an exterior tube (12) material for improved cracking and corrosion resistance of composite tubes (10) used to construct the lower furnace section of kraft recovery boilers (20). The alloy consists of essentially, on a weight-% basis, 25-35 Cr, 5-15 Fe and 50-70 Ni, with other minor alloying elements and impurities such as are normally present in commercial alloys. This compositional range includes, as a preferred composition, the range corresponding to the commercial alloy 690 (UNS N06690).
L'invention concerne un alliage Ni-Cr-Fe austénitique utilisé comme matière de tube extérieur et permettant d'améliorer la résistance aux fissures et à la corrosion de tubes composites destinés à la construction de la section foyer inférieur de chaudières de récupération de produits chimiques kraft alimentées par de la liqueur noire. Cet alliage est composé essentiellement, sur une base de % en poids, de 25-35 Cr, 5-15 Fe et 50-70 Ni et d'autres éléments d'alliage mineurs et d'impuretés normalement présents dans les alliages commercialisés. Cette plage de composition comprend, comme composition préférée, la plage correspondant à l'alliage commercialisé 690 (UNS N06690).
Kish Joseph Ralph
Singbeil Douglas Lloyd
Fpinnovations
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Pulp And Paper Research Institute Of Canada
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