Daewoo Shipbuilding & Marine Engineering (DSME) recently installed a high manganese steel liquefied natural gas (LNG) bunker fuel tank to an ultra-large crude oil carrier.
DSME and POSCO have jointly developed the tank manufacturing technology for 10 years, from pretreatment to welding to use high manganese steel to build an LNG fuel tank.
Until now, materials such as Invar (nickel alloy steel), aluminium, and stainless steel have been used for cargo holds and fuel tanks that can withstand the cryogenic temperature of −163°C.
However, they had disadvantages such as high price, difficult work process, and low strength.