Austenitic stainless steel with excellent productivity and cost reduction effect and method for producing same

An austenitic stainless steel comprising, in percent by weight (wt %), 0.1 to 0.2% of C, 0.2 to 0.3% of N, 0.8 to 1.5% of Si, 7.0 to 8.5% of Mn, 15.0 to 17.0% of Cr, 0.5% or less (excluding 0) of Ni, 1.0% or less (excluding 0) of Cu, 0 to 0.2% of Nb, and the balance of Fe and inevitable impurities, and

• satisfying Expression (1), (2), (3) and (4) below:
• 14≤23(C+N)+1.3Si+0.24(Cr+Ni+Cu)+0.1Mn≤15.16 Expression (1):
• 30≤551−462(C+N)−9.2Si−8.1Mn−13.7Cr−29(Ni+Cu)−68Nb≤80 Expression (2):
• 16≤1+45C−5Si+0.09Mn+2.2Ni−0.28Cr−0.67Cu+88.6N≤20 Expression (3):
• 2
• ≤
• (
• (
• Cr
• +
• 1.5
• Si
• +
• 0.5
• Nb
• +
• 18
• )
• (
• Ni
• +
• 0.52
• Cu
• +
• 16
• ⁢
• (
• C
• +
• N
• )
• +
• 0.5
• Mn
• +
• 36
• )
• +
• 0.262
• )
• ×
• 161
• -
• 161
• ≤
• 10
• Expression
• ⁢
• (
• 4
• )
• wherein in Expression (1), (2), (3) and (4) C, N, Si, Mn, Cr, Ni, Cu and Nb represent contents (wt %) of the elements, respectively.