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Journal of Materials Engineering

, Volume 10, Issue 3, pp 171–180 | Cite as

A metallurgical evaluation of clad alloy 800H tubing after 17 years of service in a coal fired utility boiler

  • P. Ganesan
  • C. S. Tassen
Article

Abstract

INCOLOY1 alloy 800H tubing clad with INCONEL1 alloy 671 was installed in a power generating station in 1967 and 1968. Sections of these tubes were removed periodically for metallurgical evaluation. The last section of tubing removed had been exposed for over 17 years in a boiler reheater section operating at 1005° F (540° C) and at a steam pressure of 475–500 psig (3.28–3.45 MPa). The alloy 800H provides water side corrosion resistance and the needed high temperature strength while the high chromium alloy 671 has good resistance to coal ash fire side corrosion. This paper describes the mechanical properties, microstructural stability, and the water side corrosion resistance of alloy 800H after 17 years of exposure. A brief summary of the performance of the cladding is also included.

Keywords

Ferritic Stainless Steel Alloy 800H Scanning Electron Microscope Photomicrograph Inco Alloy Metallurgical Evaluation 
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.

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Copyright information

© Springer-Verlag New York Inc 1988

Authors and Affiliations

  • P. Ganesan
    • 1
  • C. S. Tassen
    • 1
  1. 1.Inco Alloys International, Inc.Huntington

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