Metallurgical Investigations of Microstructure and Behaviour of High-Alloyed Manganese-Chromium Austenitic Steels for Generator-Rotor Retaining Rings

  • Volker Thien
  • Jürgen Ewald
  • Wolfgang Voss
Conference paper
Part of the Mikrochimica Acta book series (MIKROCHIMICA, volume 10)


The exciter coil of large generator rotors opens up into the so-called coil head at the body ends. The coil, here, must be secured by retaining rings against relative movements resulting from electro-magnetic forces but especially against centrifugal force. Because of their structural function, these retaining rings must have very high strength values — yield point up to max. 1300 N/mm2 — and consist of a non-magnetic material. Several extensive reports have been made recently about the demands on generator retaining rings and the properties of materials employed as well as cases of damages1–3. The austenitic steel X 55 MnCr(N)18K (comp. Table 1) with a nitrogen content of 0.10 %, as examined here, is mainly employed throughout the world. Nitrogen improves the strength and simultaneously stabilizes the austenite.


Eutectoid Transformation Transformation Diagram Electron Diffraction Experiment Metallurgical Investigation Great Magnification 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    E. Heinrich, G. Kröncke, and G. Tacke, Stahl u. Eisen 102, 1183 (1982).Google Scholar
  2. 2.
    M.O. Speidel, VGB-Kraftwerktechnik 62, 424 (1982).Google Scholar
  3. 3.
    J. Ewald, H. Hübner, H. Kraemer, and A.W. Schmitz, Sammelband VGB-Konferenz: Werkstoffe u. Schweißtechnik im Kraftwerk 1980, p. 280.Google Scholar
  4. 4.
    J. Albrecht and B. Scarlin, BBC-Forschungsbericht KLR 82-118 C.Google Scholar
  5. 5.
    M. Kroneis and R. Gattringer, Stahl u. Eisen 81, 431 (1961).Google Scholar

Copyright information

© Springer-Verlag Wien 1983

Authors and Affiliations

  • Volker Thien
    • 1
    • 2
  • Jürgen Ewald
    • 1
  • Wolfgang Voss
    • 1
  1. 1.Division of Materials Engineering and ResearchKraftwerk Union AGMülheim/RuhrFederal Republic of Germany
  2. 2.Abt. Technik Werkstoffe/Physikalische EigenschaftenKraftwerk Union AGMülheim/RuhrFederal Republic of Germany

Personalised recommendations