Combined Effect of Temper and Hydrogen Embrittlement on Threshold for Hydrogen-Induced Fracture in Cr-Mo Steels

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  • Hidenori Shimazu
    Graduate School of Ibaraki University, 4-12-1, Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan e-mail:
  • Shinji Konosu
    Ibaraki University, 4-12-1, Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan e-mail:
  • Yoichi Tanaka
    Nippon Steel Techno-Research, Arde-Building-Higobashi, 9F 1-15-27, Edbori, Nishiku, Osaka City, Osaka, 550-0002, Japan e-mail:
  • Masao Yuga
    JFE Steel Corporation, Steel Products Research Department, 1-1, Minamiwatarida-cho, Kawasaki-ku, Kawasaki 210-0855, Japan e-mail:
  • Hiroshi Yamamoto
    Chiyoda Corporation, Minatomirai Grand Central Tower, 4-6-2, Minatomirai, Nishi-ku, Yokohama 220-8765, Japan e-mail:
  • Naotake Ohtsuka
    Mu Ltd., REC-Hall, 1-5 Yokotani, Seta Oe-cho, Ohtsu 520-2194, Japan e-mail:

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<jats:p>This paper presents the results of the research activities of the subcommittee on hydrogen embrittlement of the Japan Pressure Vessel Research Council (JPVRC). The combined effect of temper embrittlement and hydrogen embrittlement in Cr-Mo steels is discussed. It has been recognized that Cr-Mo steels used widely in the refining and petrochemical industry are quite susceptible to temper embrittlement. Although the synergistic relation between temper embrittlement and hydrogen embrittlement is a matter of major concern, studies regarding this subject are rarely encountered. Task group VIII (TG8) of the JPVRC conducted fracture toughness tests for three kinds of 2.25Cr-1Mo steels and 2.25Cr-1Mo-0.3 V steel. These steels were prepared by subjecting them to normalizing, tempering, and postweld heat treatments (PWHTs) which simulated actual conditions. Some specimens were embrittled by step cooling (Socal-1 treatment). It was found that the threshold for hydrogen-induced fracture was lowered when the specimen was exposed to pressurized hydrogen gas (15 MPa) for 48 h at 450 °C and there was no marked indication of the synergistic action concerning this embrittlement.</jats:p>

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