High-efficiency turbo-machine impellers

Details High-efficiency turbo-machine impellers High-efficiency turbo-machine impellers

1976-05-11

1978-05-23

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Radially extending web or end plate

416241R, F04D 2928

Patent

active

040908135

ABSTRACT:
A martensitic stainless steel to be used for the impellers of turbo-blowers, compressors and the like consisting essentially, based on weight of 0.04 - 0.15% C, up to 2.0% Si, 0.2 - 2.0% Mn, 3.5 - 6.0% Ni, 10 - 16% Cr, and at least one element selected from the group consisting of 0.5 - 3.0% Mo, 0.01 - 0.8% Nb, and the balance being Fe. The amounts of .delta.-ferrite therein is not more than 10%. The steel may further contain up to 0.2% additional element or elements, i.e., N, Al, Ti, Ca, and/or a rare-earth element or elements. The steel of this composition offers high strength, great toughness, and good weldability and, when annealed after welding, it will display the same properties as after quenching and tempering. Impellers made of this steel are for heavy-duty, high-efficiency applications.

REFERENCES:
patent: 3650845 (1972-03-01), Oda et al.
patent: 3661658 (1972-05-01), Oda et al.
patent: 3664765 (1972-05-01), Ishimatsu et al.
patent: 3729345 (1973-04-01), Oda et al.
patent: 3730785 (1973-05-01), Conrad et al.
patent: 3794445 (1974-02-01), Watanabe et al.
patent: 3856434 (1974-12-01), Hoffmann
patent: 3902823 (1975-09-01), Minato et al.

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