Strain behavior of very new high manganese steel for 200,000 m3 LNG cryogenic storage tank

Abstract

The objective of this research is to investigate the actual performance of high manganese (22–26%Mn) steel as a material for LNG storage tanks. The results of joint research with POSCO, POSCO E&C, industry-academia-research committees, and Korea Gas Safety Corporation showed that the new steel is equivalent in performance to traditional 9%Ni steel but has a lower cost. The steel was practically applied in a 200,000 ㎥ LNG storage tank and the behavior of the inner wall was monitored during LNG import and export. The results showed that Poisson's ratio was measured in the range between 0.079 and 0.089. This study provides evidence that high manganese steel is a viable alternative to traditional 9%Ni steel for LNG storage tanks, providing cost savings without sacrificing performance.