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Material Identification and Safety Evaluation of Defective 15Cr1Mo1V Steel

  • Xianxi Xia
  • Guodong Zhang
  • Fei Xue
  • Qinzheng Ma
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Main steam pipe and reheat steam pipe of Russian unit boiler are mostly made of 15Cr1Mo1V steel. It is a common problem that a large number of inclusions defects were found in the pipeline overhaul census. In this paper 15Cr1Mo1V steel pipe containing defects was studied by material identification and safety assessment. The results showed that the pipe microstructure was bainite + ferrite + carbide particles, aging at level 3. There were a large number of string-like and granular inclusions inside the material, mainly composed of manganese sulfide inclusions. Minimum longitudinal impact energy and lateral impact energy were both at lower level. The pipe crack was exempt from fatigue fracture assessment. The pipeline creep loss was 0.616, pipeline fatigue loss was 2.23 × 10−6, the main loss of pipeline was creep damage, and therefore more attention should be paid to pipeline operating temperature and pressure in the follow-up operation to avoid over-temperature creep resulting in accelerated failure.

Keywords

Inclusion defects Material identification Safety evaluation Life prediction 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Xianxi Xia
    • 1
  • Guodong Zhang
    • 1
  • Fei Xue
    • 1
  • Qinzheng Ma
    • 1
  1. 1.Suzhou Nuclear Power InstituteSuzhouChina

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