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Evaluation of hydrogen embrittlement susceptibility of temper embrittled 2.25Cr–1Mo steel by SSRT method

Authors
Journal
Engineering Failure Analysis
1350-6307
Publisher
Elsevier
Publication Date
Volume
19
Identifiers
DOI: 10.1016/j.engfailanal.2011.08.008
Keywords
  • Hydrogenation Reactor
  • Aged 2.25Cr–1Mo Steel
  • Temper Embrittlement
  • Hydrogen Embrittlement
  • Slow Strain Rate Test (Ssrt)
Disciplines
  • Chemistry
  • Engineering

Abstract

Abstract In petrochemical and petroleum refining industries, the hydrogenation technology is widely used. As materials used in key equipment, such as hydrogenation reactors, are subjected simultaneously to the action of hydrogen and high temperature, studies on the material property degradation and remaining life prediction are of very important engineering and academic significance. An in-service test block from the hydrogenation reactor DC101A was divided and tested. Material properties of 2.25Cr–1Mo steel after service of about 10 5 h at the operating pressure of 17.12 MPa and temperature of 427 °C were obtained. Effect of the hydrogen concentration on strength and plasticity of the temper embrittled and de-embrittled 2.25Cr–1Mo steel was studied in the slow strain rate tests (SSRTs). Hydrogen embrittlement susceptibility of the material was evaluated with hydrogen embrittlement index. The safe hydrogen concentration range within which no hydrogen embrittlement occurs was also determined.

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