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  • Title(Kor)
    API X70강 배관 모재부의 수소 손상에 관한 연구
  • Title(Eng)
    A Study on Hydrogen Damage in Base Metal of API X70
  • Keyword
    Electrochemical hydrogen charging(전기화학적 수소 장입), Small punch test(소형 펀치 시험), Hydrogen damage(수소 손상), Strength(재료강도), X70
  • Author(Kor)
    이호준1⋅유종민1⋅다오반헝1⋅배재현1⋅김우식2⋅윤기봉3†
  • Author(Eng)
    HO JUN LEE1, JONG MIN YU1, VAN HUNG DAO1, JAE HYEON BAE1, WOO SIK KIM2, KEE BONG YOON3†
  • Date
    2020-06
  • Attach file
  • Page
    Page. 284~292
  • Abstract(Eng)
  • In this study, hydrogen charging was conducted for API X70 steel by the electro-chemical hydrogen charging method. Right after hydrogen was diffused from the specimen surface to the inside of the X70, the small punch tests and hydrogen concentration analysis was conducted within 5 minutes. Hydrogen was analyzed by melting the whole specimen and detect the gas after melting. Mechanical properties were measured by the small punch (SP) testing. Fracture surface and specimen surface were observed using scanning electron microscope. Three tests were repeated for study sensitivity of the SP test results under a same charging condition. It was observed that the variation of the maximum load, SP displacement at failure, hydrogen concentration as the charging period was not much in the case of X70 as the other steel such as Inconel. It can be argued that X70 base metal may have high hydrogen damage resistance and hydrogen diffusion in the base metal would not cause much embrittlement. Limitations of the SP test with 0.5 mm thickness for hydrogen damage test for X70 were discussed.