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US 7,404,699 B2Granted
Turbomachine
AssigneeSiemens Aktiengesellschaft
InventorsNorbert Thamm, Andreas Ulma
Life of this patent
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Abstract
The invention relates to a turbine machine, in particular, a steam turbine, comprising an inner housing, a turbine shaft, mounted such as to rotate, characterized in that the inner housing and the turbine shaft are produced from differing materials. The turbine is made from a chrome steel with 9 to 12 wt. % of chromium and the inner housing from a chrome steel with 1 to 2 wt % of chromium.
Claims9
A turbomachine, comprising:
- a rotatably mounted turbine shaft made from a chromium steel material containing 9% to 12% by weight chromium;
- an inner casing coaxial with the rotor shaft made from a chromium steel containing 1% to 2% by weight chromium and having a lower hot strength than the turbine shaft material.
Dependencies are inferred from the claim text.