ABSTRACT As high manganese austenitic steel has been developed to replace 9%Ni, 304 stainless steels and Al5083 alloy, widely used in cryogenic applications, much attention are now focused on the development of the associated welding consumable in order to maximize the use of the high manganese steel under cryogenic environment. In particular, flux cored arc welding consumable which allows all-positional welding for high-Mn steel has been required to fabricate LNG tank. In the present study, the microstructure and mechanical properties were investigated for high manganese weld metals produced by metal cored arc welding consumables. Flux cored wires are then designed with both fluxes containing less than 10% of acidic slag formers such as rutile(TiO2) and silica(SiO2) for all positional welding and austenite stabilizing elements such as C, Mn and Ni for increasing toughness at cryogenic temperature and strength at room temperature. Microstructural and mechanical properties are then evaluated as a function of alloy composition variations. The weld metals produced by newly-developed high manganese cryogenic flux cored welding consumables show the charpy impact toughness of larger than 54J at -196°C and the yield strength of 400MPa at room temperature. This result encourages the extensive applications to cryogenic services with a big cost competitiveness.