LNG CCS적용을 위한 고망간강의 극저온 피로성능 평가
Fatigue Strength Assessment of High Manganese Steel for LNG CCS
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초록
Liquid natural gas is stored and transported inside cargo tank which is made of specially designed cryogenic materials such as 9% Nisteel, Al5083-O alloy and SUS304 and so on. The materials have to keep excellent ductile characteristics under the cryogenicenvironment, down to -163oC, in order to avoid the catastrophic sudden brittle fracture during the operation condition. High manganesesteel is considered to be the promising alternative material that can replace the commonly used materials mentioned above owing to itscost effectiveness. In line with this industrial need, the mechanical properties of the high manganese steel under both room andcryogenic environment were investigated in this study focused on its tensile and fatigue behavior. In terms of the tensile strength, theultimate tensile strength of the base material of the high manganese steel was comparable to the existing cryogenic materials, but itturned out to be undermatched one when welding is involved in. The fatigue strength of the high manganese steel under roomtemperature was as good as other cryogenic materials, but under cryogenic environment, slightly less than others though better than Al5083-O alloy.
Abstract
Liquid natural gas is stored and transported inside cargo tank which is made of specially designed cryogenic materials such as 9% Nisteel, Al5083-O alloy and SUS304 and so on. The materials have to keep excellent ductile characteristics under the cryogenicenvironment, down to -163oC, in order to avoid the catastrophic sudden brittle fracture during the operation condition. High manganesesteel is considered to be the promising alternative material that can replace the commonly used materials mentioned above owing to itscost effectiveness. In line with this industrial need, the mechanical properties of the high manganese steel under both room andcryogenic environment were investigated in this study focused on its tensile and fatigue behavior. In terms of the tensile strength, theultimate tensile strength of the base material of the high manganese steel was comparable to the existing cryogenic materials, but itturned out to be undermatched one when welding is involved in. The fatigue strength of the high manganese steel under roomtemperature was as good as other cryogenic materials, but under cryogenic environment, slightly less than others though better than Al5083-O alloy.
참고문헌 (8)
- Chung, S.W, "Fatigue characteristics of LNG FPSO CCS materials at room and cryogenic temperature", Proceedings of the Annual Autumn Meeting (2010), Society of Naval Architecture of Korea
- DNV, "Classification Notes No. 30.7 Fatigue Assessment of Ship Structures" (2008), DNV
- International Maritime Organization, "International Gas Carrier Code" (2012), IMO publishing
- Kim, K.S, "Development of new IMO type B tank based on the results of cryogenic material property tests", Proceedings of the ASTM 2011 30th International Conference on Ocean, Offshore and Arctic Engineering OMAE2011, pp.225~232 (2011)
- Nam, S.W., "Mechanical properties of LNG FPSO CCS materials at room and cryogenic temperatures", Proceedings of the Annual Autumn Meeting, Society of Naval Architecture of Korea (2010)
- The American Society of Testing and Materials, "E8M-04 Standard Test Methods for Tension Testing of Metallic Materials", ASTM International, ~ (2004)
- Fatigue Recommendations, "The International Institute of Welding", International Institute of Welding, ~, pp.XIII-1965-03 (2005), XV-1127-03
- Yoo, C.H., "Fatigue characteristics of LNG FPSO CCS materials at room and cryogenic temperature", Proceedings of the Annual Autumn Meeting, Society of Naval Architecture of Korea (2010)