Patent ID: 7780908

Claim:
An austenitic stainless steel comprising: (a) 0.051 wt % to 0.055 wt % of C; (b) 0.2 wt % to 1.0 wt % of Si; (c) 8.55 wt % to 10.12 wt % of Mn; (d) 14.6 wt % to 14.69 wt % of Cr; (e) 4.15 wt % to 4.18 wt % of Ni; (f) 0.04 wt % to 0.07 wt % of N; (g) 1.63 wt % to 1.67 wt % of Cu; (h) trace amount of Mo; and the balance being Fe and incidental impurities; and optionally one or more of the following residuals 5 to 30 ppm of B, no more than 150 ppm of S, and/or no more than 0.06 wt % of P, wherein said austenitic stainless steel has a δ-ferrite content that is less than 8.5 and that satisfies the following formula δ-ferrite=6.77[( d )+( h )+1.5( b )]−4.85[( e )+30( a )+30( f )+0.5( c )+0.3( g )]−52.75.