Prospects for Martensitic 12 % Cr Steels for Advanced Steam Power Plants

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Abstract

Creep strength improvements of martensitic 9 % Cr steels have been obtained by controlled additions of V, Nb, N and B to the steels, which resulted in precipitation hardening by fine stable nitrides based on V and Nb as well as in stabilization of Cr carbides against coarsening. The best steels P92 and FB2 are now used in power plants up to 600–620 °C steam temperature. For higher steam temperatures up to 650 °C steels with 11–12 % Cr are needed for better resistance against steam oxidation. However, fine V and Nb based nitrides may transform to coarse Z-phase [Cr(V,Nb)N] nitrides in steels with such Cr contents, leading to a strength loss in long-term creep. The paper presents the status of development of new stable 12 Cr steels based on the concepts of either strengthening by fine Z-phase nitrides or on elimination of nitrides from the steels.
Original languageEnglish
JournalTransactions of the Indian Institute of Metals
Volume69
Issue number2
Pages (from-to)183-188
ISSN0972-2815
DOIs
Publication statusPublished - 2016
Event7th International Conference on Creep, Fatigue and Creep-Fatigue Interaction - Kalpakkam, India
Duration: 19 Jan 201622 Jan 2016

Conference

Conference7th International Conference on Creep, Fatigue and Creep-Fatigue Interaction
CountryIndia
CityKalpakkam
Period19/01/201622/01/2016

Keywords

  • Material Science
  • Metallic Materials
  • Materials Science, general
  • Tribology, Corrosion and Coatings
  • SC5
  • 9–12 % Cr steels
  • Z-phase
  • Creep strength
  • Alloy design

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