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Structural Features and High-Temperature Strength of the Metal of Centrifugally Cast Tubes from Steel 15Kh1M1F

Authors
  • Perevezentseva, T. V.1
  • Zlepko, V. F.1
  • Kalugin, R. N.1
  • 1 All-Russia Thermal Engineering Institute, Moscow, Russia , Moscow
Type
Published Article
Journal
Power Technology and Engineering
Publisher
Kluwer Academic Publishers-Plenum Publishers
Publication Date
May 01, 2002
Volume
36
Issue
3
Pages
145–151
Identifiers
DOI: 10.1023/A:1020982426266
Source
Springer Nature
Keywords
License
Yellow

Abstract

Special features of the structure and properties of the metal of centrifugally cast large-diameter tubes from steel 15Kh1M1F used in hot reheat steam conduits of high-power generating units are discussed. The metal of the tubes in the initial state is shown to possess structural heterogeneity primarily represented by segregation bands. The segregation bands are responsible for scattering of the mechanical properties and a 5 – 10% decrease in the long-term strength in the initial condition. The decline of the long-term strength intensifies with the propagation of the segregation over the cross section of the tubes. The segregation lowers the stability of the structure and properties of the tubes in operation at a high level of long-term plasticity. By reducing the degree of segregation in centrifugally cast tubes the time of their operation in steam conduits can be increased to 200,000 h.

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