Vapor turbine operating with geothermal vapors containing corrosive agents such as chlorides and/or sulfides in particular. The turbine comprises a series of rotor blades made of a nickel alloy containing a quantity of nickel ranging from 55% to 59% by weight to avoid the washing of the geothermal vapors, maintaining a high useful life of the series of rotor blades and vapor turbine.

 
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