Steam turbine rotor having graded weldments

Details Steam turbine rotor having graded weldments Steam turbine rotor having graded weldments

B - Operations, Transporting

32

B

B32B 15/01 (2006.01) B23K 9/02 (2006.01) B23K 31/02 (2006.01) B23K 35/00 (2006.01) F01D 5/00 (2006.01)

Patent

CA 2049091

This invention provides steam turbine components, such as rotor disc, which include a ring member comprising a low alloy ferrous base metal having less than about 6 wt.% alloy ingredients and a ferrous graded layer disposed on the ring member which includes a plurality of layered weldments having an increasing weight percentage of a layering metal containing Cr. Disposed on the graded layer of this invention is a Cr-containing steeple alloy disposed on the graded layer for optimizing a life extending property of the steeple region of the turbine component.

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