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Selection of particular materials for steam turbine blades

A technology of turbine blades and steam turbines, applied in the field of mechanism and technology, can solve the problem that martensitic steel is susceptible to droplet corrosion

Inactive Publication Date: 2015-07-22
NUOVO PIGNONE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, due to the high angular velocity of the turbine blades, martensitic steels are susceptible to droplet corrosion based on the vapor condensation characteristics at certain turbine blade locations

Method used

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  • Selection of particular materials for steam turbine blades
  • Selection of particular materials for steam turbine blades
  • Selection of particular materials for steam turbine blades

Examples

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Embodiment Construction

[0012] The following description of the exemplary embodiments refers to the accompanying drawings. The same reference numbers in different drawings indicate the same or similar elements. The following detailed description does not limit the invention. Instead, the scope of the invention is defined by the appended claims. For simplicity, the following examples discuss steam turbine terminology and construction.

[0013] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the disclosed subject matter. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodime...

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Abstract

Apparatus and method for decreasing the corrosion susceptibility and / or the liquid droplet erosion susceptibility of one or more turbine blades associated with a steam turbine 102. One or more of the turbine blades 106 are constructed of an Austenitic Nitrogen strengthened stainless steel; such Austenitic stainless steel has a weight percentage of manganese bigger than ten and preferably a weight percentage of nickel smaller than five; advantageously, such Austenitic stainless steel is strengthened with nitrogen. The blades constructed of such Austenitic stainless steel are configured in the later stages of the steam turbine.

Description

technical field [0001] Embodiments of the subject matter disclosed herein relate generally to methods and apparatus, and more particularly to mechanisms and techniques, for using austenitic stainless steel for steam turbine blades. Background technique [0002] Today, steam turbines are widely utilized in many industries across a variety of applications. An important problem associated with steam turbines is the failure of the turbine blades during operation. Turbine blades for prior art steam turbines are made of martensitic stainless steel, but have disadvantages such as lower erosion resistance and lower corrosion resistance. Furthermore, wear, corrosion, general erosion, and also stress corrosion cracking (SCC) and / or failure of turbine blades on steam turbines lead to costly downtime for repair or maintenance. [0003] Specifically, martensitic steel turbine blades are eroded by compounds and contaminants associated with high pressure steam. These compounds include, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/14
CPCF05D2300/10F05D2220/31F01D5/28Y10T29/49321F01D1/02
Inventor M.贝拉奇F.约泽利M.布乔尼M.马内蒂
Owner NUOVO PIGNONE SPA