Low cost, corrosion and heat resistant alloy for diesel...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 30/00 (2006.01) C22C 19/05 (2006.01) F01L 3/02 (2006.01)

Patent

CA 2420346

A low cost, highly heat and corrosion resistant alloy useful for the manufacture of diesel engine components, particularly exhaust valves, comprises in % by weight about 0.15-0.65% C, 40-49% Ni, 18-22% Cr, 1.2-1.8% Al, 2-3% Ti, 0.9-7.8% Nb, not more than 1% Co and Mo each, the balance being essentially Fe and incidental impurities. The Ti : Al ratio is <=2 : 1 and the Nb : C weight % ratio is within a range of 6 : 1 and 12 : 1. Ta may be substituted for Nb on an equiatomic basis.

L'invention concerne un alliage bon marché, présentant une haute résistance à la chaleur et à la corrosion, qui peut être utilisé pour la fabrication de composants de moteurs diesel, en particulier de soupapes d'échappement. Cet alliage comprend, en pour-cent en poids, environ 0,15-0;65 % de C, 40-49 % de Ni, 18-22 % de Cr, 1,2-1,8 % de Al, 2-3 % de Ti, 0,9-7,8 % de Nb, au maximum 1 % de Co et 1 % de Mo, le reste étant constitué essentiellement de Fe et des impuretés obligatoires. Le rapport, en pour cent en poids, Ti:Al est <= 2: 1, et le rapport, en pour-cent en poids, Nb: C est compris dans la plage 6:1- 12: 1. Le Ta peut être remplacé par du Nb sur une base équiatomique.

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