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Fracture at all Scales pp 151–169Cite as

Characterization of Tube Repair Weld in Thermal Power Plant Made of a 12%Cr Tempered Martensite Ferritic Steel

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Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

Abstract

The heat resistant tempered martensite ferritic steel X20CrMoV121 (DIN) has been extensively used within the last few decades as a material for boiler tubing systems and pipelines in thermal power plants (TPP). Long-term behavior of this steel is vastly researched and very well known, but main disadvantage is its poor weldability. In situ welding of martensitic steels is always challenging task and is usually quite difficult to implement properly in a short time, during forced outages of TPP. In this paper, characterization and mechanical properties of undermatch welded joint made during partial replacement of boiler outlet superheater (SH) in TPP by austenitic filler material, after 10 years of service are presented. Due to “cold” technique of welding, which does not required post weld heat treatment, this procedure were regular and widely used repair welding technique in two TPP (620 MW) units. In the purpose of comparison, two other type of matching welding joints of the same SH were also characterized: shop welded joint made by electrical resistance flash butt welding, as well as field welded joint made by gas tungsten arc welding during assembling of SH, which were both in service approximately 150,000 h.

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Author information

Authors and Affiliations

  1. Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, Belgrade, 11120, Serbia

    Gordana M. Bakic, Milos B. Djukic, Bratislav Rajicic, Vera Sijacki Zeravcic & Nenad Milosevic

  2. Innovation Center of Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, Belgrade, 11120, Serbia

    Aleksandar Maslarevic

  3. Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA

    Miladin Radovic

  4. Department of Materials Sciences, Institute of Nuclear Sciences Vinca, University of Belgrade, P.O. Box 522, Belgrade, Serbia

    Vesna Maksimovic

Authors
  1. Gordana M. Bakic
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  2. Milos B. Djukic
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  3. Bratislav Rajicic
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  4. Vera Sijacki Zeravcic
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  5. Aleksandar Maslarevic
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  6. Miladin Radovic
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  7. Vesna Maksimovic
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  8. Nenad Milosevic
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Corresponding author

Correspondence to Gordana M. Bakic .

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Editors and Affiliations

  1. LABPS, ENIM, Metz, France

    Guy Pluvinage

  2. Faculty of Tech & Metallurgy, University of Beograd, Beograd, Serbia

    Ljubica Milovic

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Bakic, G.M. et al. (2017). Characterization of Tube Repair Weld in Thermal Power Plant Made of a 12%Cr Tempered Martensite Ferritic Steel. In: Pluvinage, G., Milovic, L. (eds) Fracture at all Scales. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-32634-4_8

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  • DOI: https://doi.org/10.1007/978-3-319-32634-4_8

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-32633-7

  • Online ISBN: 978-3-319-32634-4

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