Creep Equations for Heat Resistant Steels

  1. Prof. Dr. P. Neumann2,
  2. Dr. D. Allen3 and
  3. Prof. Dr. E. Teuckhoff4
  1. C. Berger,
  2. J. Granacher and
  3. Y. Kostenko

Published Online: 5 JAN 2006

DOI: 10.1002/3527606181.ch60

Steels and Materials for Power Plants, Volume 7

Steels and Materials for Power Plants, Volume 7

How to Cite

Berger, C., Granacher, J. and Kostenko, Y. (2000) Creep Equations for Heat Resistant Steels, in Steels and Materials for Power Plants, Volume 7 (eds P. Neumann, D. Allen and E. Teuckhoff), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606181.ch60

Editor Information

  1. 2

    Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany

  2. 3

    ABB Asltom Power UK Ltd., Cambridge Road, Whetstone, Leicester LE9 GLH, United Kingdom

  3. 4

    Siemens AG, Postfach 3240, 91050 Erlangen, Germany

Author Information

  1. Institute for Materials Technology, Technical University of Darmstadt, Germany

Publication History

  1. Published Online: 5 JAN 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301959

Online ISBN: 9783527606184

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Keywords:

  • steels for power plants;
  • materials for power plant;
  • creep equations;
  • heat resistant steels

Summary

Creep equations are necessary for the design and supervision of high temperature components which are loaded under static or quasistatic conditions. To obtain a sound basis for the development of such equations, the typical results of usual creep rupture tests have to be expanded in most cases by supplementary creep tests. The modeling of a creep equation for a steel type is based on condensed creep data, which are given from a scatter band analysis of multi-heat creep data. From these data mean creep curves are derived which represent the data basis for the creep equation. Preferentially creep equations of the modified Garofalo type are used, containing terms for initial plastic strain as well as primary, secondary and tertiary creep strain. The development of such creep equations is demonstrated on the example of the steel X 3 CrNiMoN 17 13. Further, a new method of direct creep curve assessment is described, which delivers a basis to improve the time temperature parameter based creep equations. At a 1 % CrMoNiV-rotor steel this method was used to eliminate the effect of stress increase caused by scaling of the test pieces. The creep equations are valid for realistic loading conditions. They are available in the form of subroutines for finite element programs.