Water-turbine runner and process for manufacturing the same

Details Water-turbine runner and process for manufacturing the same Water-turbine runner and process for manufacturing the same

1989-11-15

1991-07-30

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Coating, specific composition or characteristic

415200, 298897, B63H 100

Patent

active

050355791

ABSTRACT:
A water turbine runner has a plurality of vanes, each made of a rolled steel plates which contains, by weight, 0.01 to 0.10% of C, 0.10 to 1.0% of Si, 0.10 to 2% of Mn, 2 to 7% of Ni, 10 to 15% of Cr and 0.10 to 4% of Mo, 71.9 to 87.7% of Fe, and which has a metallic structure mixture containing, by volume, martensite and 10 to 35% of residual austenite. Each of the vanes is made of a plurality of plate pieces, cut out from the rolled steel plate, press-formed in a shape of a part of the vane and joined by welding into the complete vane.

REFERENCES:
patent: 3765793 (1973-10-01), Savonuzzi
patent: 3902823 (1975-09-01), Minato et al.
patent: 4322200 (1982-03-01), Stiegelmeier
patent: 4609577 (1986-09-01), Long
patent: 4850187 (1989-07-01), Siga et al.

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