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Creep rupture strength of tungsten‐alloyed 9‐12 % Cr steels for piping in power plants
Author(s) -
Bendick Walter,
Ring Markus
Publication year - 1996
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199605505
Subject(s) - creep , tungsten , metallurgy , materials science , piping , forensic engineering , physics , engineering , mechanical engineering
The creep rupture strengths of the three tungsten‐alloyed 9‐12% Cr‐steels E 911, NF 616 and HCM 12A are discussed. It is shown that Larson‐Miller assessments may lead to an overestimation of the long‐term creep rupture strength because of microstructural changes. The presented assessments indicate that all three alloys will have similar creep rupture strengths in the range of 110‐120 MPa for 10 5 h and 600°C. To obtain reliable estimates for creep rupture strength, however, further long‐term tests are needed. In any case, the tungsten‐alloyed steels will enable the main steam temperature to be raised by about 20°C over that possible with P 91.