고망간강을 적용한 극저온 B-type 탱크의 성능 평가에 대한 연구

Abstract

These day, Shale gas was developed and Eco-friendly energy's demand shaply increase. As a result, LNG carrier's order increased, and LNG fuelled ship' technology is growing day by day. LNG Tank was mainly designed by NI steel, stainlesssteel, AL steel. The materials specialized ductile characteristics under the cryogenic environment, in order to prevent the damaged during operation. But the cost of the materials is relatively high by other material. In this reason, Ship yard and Ship owner hesitate about retrofit and shipbuilding to LNG fuelled ship. Some steel company make an attempt to applicate High manganenese steel at LNG tank. High anganenese steel and exsiting material are on level in cryogenic environment. Also High manganenese has price competitiveness.Tensil strength, fatigue strength and cryogenic perfomance test have to carry out for cryogenic tank perfomance evaluation. In this papaer, It is that description for cryogenic perfoamce test. Especially, condition for BOR(Boil off rate), Cool down procedure, Loading rate are considers for objectively perfoamce evaluation