Journal of the Korean Society of Industry Convergence (한국산업융합학회 논문집)

The Korean Society of Industry Convergence (한국산업융합학회)
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A Study on the Charpy Impact Performance of Structural Steel Considering the Leakage of Cryogenic Liquefied Gas

극저온 액화가스 누출에 의한 선체 구조용 강재의 샤르피 충격성능에 관한 연구

  • Dong Hyuk Kang (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Jeong-Hyeon Kim (Hydrogen Ship Technology Center, Pusan National University) ;
  • Seul-Kee Kim (Hydrogen Ship Technology Center, Pusan National University) ;
  • Tae-Wook Kim (Hydrogen Ship Technology Center, Pusan National University) ;
  • Doo-Hwan Park (Hydrogen Ship Technology Center, Pusan National University) ;
  • Ki-Beom Park (Hydrogen Ship Technology Center, Pusan National University) ;
  • Jae-Myung Lee (Department of Naval Architecture and Ocean Engineering, Pusan National University)
  • 강동혁 (부산대학교 조선해양공학과) ;
  • 김정현 (부산대학교 수소선박기술센터) ;
  • 김슬기 (부산대학교 수소선박기술센터) ;
  • 김태욱 (부산대학교 수소선박기술센터) ;
  • 박두환 (부산대학교 수소선박기술센터) ;
  • 박기범 (부산대학교 수소선박기술센터) ;
  • 이제명 (부산대학교 조선해양공학과)
  • Received : 2023.03.09
  • Accepted : 2023.04.03
  • Published : 2023.04.30
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Abstract

Environmental regulations are being strengthened worldwide to solve global warming. For this reason, interest in eco-friendly gas fuels such as LNG and hydrogen is continuously increasing. However, when adopting eco-friendly gas fuel, liquefying at a cryogenic temperature is essential to ensure economic feasibility in storage and transportation. Although austenitic stainless steel is typically applied to store cryogenic liquefied gas, structural steel can experience sudden heat shrinkage in the case of leakage in the loading and unloading process of LNG. In severe cases, the phase of the steel may change, so care is required. This study conducted Charpy impact tests on steel material in nine different temperature ranges, from room to cryogenic temperatures, to analyze the effects of cryogenic liquefied gas leaks. As a result of the study, it was not easy to find variations in ductile to brittle transition temperature (DBTT) due to the leakage of cryogenic liquefied gas. Still, the overall impact toughness tended to decrease, and these results were verified through fracture surface analysis. In summary, brittle fracture of the steel plate may occur when a secondary load is applied to steel for hull structural use exposed to a cryogenic environment of -40 ℃ or lower. Therefore, it needs to be considered in the ship design and operating conditions.

Keywords

Acknowledgement

이 연구는 2022년도 산업통상자원부 및 산업기술평가관리원(KEIT) 연구비 지원에 의한 연구임 (20017530). 이 논문은 2022년도 정부(해양수산부)의 재원으로 해양수산과학기술진흥원-해양 부유쓰레기 수거처리용 친환경 선박기술 개발 사업지원을 받아 수행된 연구임(KIMST-20220494).

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