Austenitic stainless steel having excellent processability and surface characteristics, and manufacturing method therefor

An austenitic stainless steel comprising, by weight %, 0.005% to 0.15% of carbon (C), 0.1% to 1.0% of silicon (Si), 0.1% to 2.0% of manganese (Mn), 6.0% to 10.5% of nickel (Ni), 16% to 20% of chromium (Cr), 0.005% to 0.2% of nitrogen (N), 0.01% to 0.2% of molybdenum (Mo), 0.1% to 4.0% of copper (Cu), the remainder iron (Fe) and other unavoidable impurities,

• including a Ni surface segregation portion which is a Ni-enriched region having a Ni concentration that is higher than an average Ni concentration on a surface, and a Ni surface negative segregation portion which is a Ni-depleted region having a Ni concentration that is lower than the average Ni concentration on the surface,
• wherein a degree of Ni surface negative segregation defined by the following Formula (1) is in a range of 0.6 to 0.83,
• wherein a Ni surface segregation ratio defined by the following Formula (2) is in a range of 1.1 to 1.6,
• (CNi-Min)/(CNi-Ave) Formula (1),
• (CNi-Max)/(CNi-Min) Formula (2),
• where CNi-Min is a minimum concentration of Ni on the surface of the austenitic stainless steel, the minimum concentration of Ni is measured at the Ni negative segregation portion, and CNi-Ave is an average concentration of Ni on the surface of the austenitic stainless steel, and CNi-Max is a maximum concentration of Ni on the surface of the austenitic stainless steel.