A nickel-based alloy excellent in corrosion resistance and...

C - Chemistry – Metallurgy – 22 – C

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C22C 19/05 (2006.01) F22B 37/04 (2006.01) F28F 21/08 (2006.01)

Patent

CA 2210503

An alloy having an excellent corrosion resistance and workability and being suitable particularly for seamless tubes of the industrial waste incineration boiler. The alloy consists essentially of, in weight %,: up to 0.05 % C, up to 0.5 % Si up to 0.5 % Mn, up to 0.01 % P 20 - 25 % Cr, 8 - 12 % Mo, more than 0.5 % and up to 1.0 % Nb, more than 15 % and up to 20 % Fe, up to 0.4 % Al, up to 0.1 % in total of rare earth metals, up to 0.01 % Ca, up to 0.01 % Mg, up to 0.01 % B, and the balance Ni and incidental impurities, wherein the Fe content and the Nb content are defined so as to satisfy the following formula (a): Fe (%) ~ 4 x Nb (%) + 12.5 ...(a)

Alliage d'excellente qualité quant à la résistance à la corrosion et à l'ouvrabilité; il convient particulièrement bien aux tubes sans soudure des chaudières pour l'incinération de déchets industriels. L'alliage renferme principalement en % en poids : jusqu'à 0,05 % de C, jusqu'à 0,5 % de Si, jusqu'à 0,5 % de Mn, jusqu'à 0,01 % de P, de 20 à 25 % de Cr, de 8 à 12 % de Mo, plus de 0,5 % et jusqu'à 1,0 % de Nb, plus de 15 % et jusqu'à 20 % de Fe, jusqu'à 0,4 % d'Al, jusqu'à 0,1 % en tout de terres rares, jusqu'à 0,01 % de Ca, jusqu'à 0,01 % de Mg, jusqu'à 0,01 % de B, le reste étant constitué de Ni et d'impurités diverses, dont les teneurs en Fe et en Nb correspondent à la formule Fe (%) ~ 4 x Nb (%) + 12.5 ...(a).

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