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Fatigue Strength Assessment of High Manganese Steel for LNG CCS

LNG CCS적용을 위한 고망간강의 극저온 피로성능 평가

  • Lee, Jin-Sung (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kim, Kyung-Su (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kim, Yooil (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Yu, Chang-Hyuk (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Park, Jooil (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kang, Bong-Ho (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 이진성 (인하대학교 조선해양공학과) ;
  • 김경수 (인하대학교 조선해양공학과) ;
  • 김유일 (인하대학교 조선해양공학과) ;
  • 유창혁 (인하대학교 조선해양공학과) ;
  • 박주일 (인하대학교 조선해양공학과) ;
  • 강봉호 (인하대학교 조선해양공학과)
  • Received : 2013.04.18
  • Accepted : 2014.04.14
  • Published : 2014.06.20

Abstract

Liquid natural gas is stored and transported inside cargo tank which is made of specially designed cryogenic materials such as 9% Ni steel, Al5083-O alloy and SUS304 and so on. The materials have to keep excellent ductile characteristics under the cryogenic environment, down to -163oC, in order to avoid the catastrophic sudden brittle fracture during the operation condition. High manganese steel is considered to be the promising alternative material that can replace the commonly used materials mentioned above owing to its cost effectiveness. In line with this industrial need, the mechanical properties of the high manganese steel under both room and cryogenic environment were investigated in this study focused on its tensile and fatigue behavior. In terms of the tensile strength, the ultimate tensile strength of the base material of the high manganese steel was comparable to the existing cryogenic materials, but it turned out to be undermatched one when welding is involved in. The fatigue strength of the high manganese steel under room temperature was as good as other cryogenic materials, but under cryogenic environment, slightly less than others though better than Al 5083-O alloy.

Keywords

References

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