The present invention provides a new composition of super austenitic stainless steel. According to an embodiment of the present invention, through a new alloy design of super austenitic stainless steel, the area fraction of sigma (σ) phase, which is the cause of high brittleness, among welded metal parts welded using super austenitic stainless steel is 3 % Or less, it is possible to provide a super austenitic stainless steel with improved mechanical properties of the welded metal part of the super austenitic stainless steel.
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