Cavitation resistant fluid impellers and method of making same

C - Chemistry – Metallurgy – 22 – C

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C22C 38/38 (2006.01) C22C 38/58 (2006.01) F04D 29/22 (2006.01)

Patent

CA 2193833

A fluid impeller for applications requiring superior cavitation erosion resistance. The impeller has a body fabricated from a castable metastable austenitic steel alloy which has a chemical composition in the range according to table (I), the balance comprising iron and impurities. The preferred range is 17.5-18.5% chromium, 0.5-0.75% nickel, 0.45-0.55% silicon. 0.2-0.25% nitrogen, 15.5-16.0 % manganese and 0.1-0.12 % carbon. Quantitative testing has shown cavitation resistance of four to six times that of standard boiler feed pump materials. A method for making cavitation resistant fluid impellers is also disclosed.

l'invention concerne un rotor à fluide destiné à être utilisé dans des conditions nécessitant une résistance supérieure à l'érosion par cavitation. Le rotor présenté comprend un corps constitué d'un alliage d'acier austénitique métastable, moulable, dont la composition chimique correspond au tableau (I), le reste, par rapport audit tableau, étant constitué de fer et d'impuretés. La composition préférée est la suivante: 17,5-18,5 % de chrome, 0,5-0,75 % de nickel, 0,45-0,55 % de silicium, 0,2-0,25 % d'azote, 15,5-16,0 % de manganèse et 0,1-0,12 % de carbone. Des essais quantitatifs ont montré qu'un tel matériau a une résistance à la cavitation qui est de quatre à six foix plus grande que celle de matériaux utilisés pour fabriquer des pompes d'alimentation de chaudière standard. L'invention concerne également un procédé de fabrication de rotors à fluide résistant à la cavitation.

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