Nonmagnetic austenitic stainless steel and manufacturing method therefor

A non-magnetic austenitic stainless cold-rolled steel sheet comprising, in percent (%) by weight of the entire composition, C:

• 0.01 to 0.05%, Si:
• 1.5% or less, Mn:
• 0.5 to 3.5%, Cr:
• 17.0 to 22.0%, Ni:
• 9.0 to 14.0%, Mo:
• 1.0% or less, Cu:
• 0.2 to 2.5%, N:
• 0.05 to 0.25%, the remainder of iron (Fe) and other inevitable impurities, and
• satisfying following Formulas (1) and (2).
• 0≤3*(Cr+Mo)+5*Si−65*(C+N)−2*(Ni+Mn)−27≤5 (1)
• 660−500*(C+N)−10*Cr−30*(Ni+Si+Mo+Cu)≤0 (2)
• (Here, Cr, Mo, Si, C, N, Ni, Mn and Cu mean the content (% by weight) of each element)

A manufacturing method of a non-magnetic austenitic stainless steel, the manufacturing method comprising,

• manufacturing a hot-rolled annealed steel sheet by performing hot rolling and annealing heat treatment on a slab comprising, in percent (%) by weight of the entire composition, C:
• 0.01 to 0.05%, Si:
• 1.5% or less, Mn:
• 0.5 to 3.5%, Cr:
• 17.0 to 22.0%, Ni:
• 9.0 to 14.0%, Mo:
• 1.0% or less, Cu:
• 0.2 to 2.5%, N:
• 0.05 to 0.25%, the remainder of iron (Fe) and other inevitable impurities;
• and
• manufacturing a cold-rolled steel sheet by cold rolling the hot-rolled annealed steel sheet at a reduction ratio of 60% or more, and
• wherein the slab satisfies following Formulas (1) and (2),
• a permeability of the hot-rolled annealed steel sheet and the cold-rolled steel sheet is 1.05 or less.
• 0≤3*(Cr+Mo)+5*Si−65*(C+N)−2*(Ni+Mn)−27≤5 (1)
• 660−500*(C+N)−10*Cr−30*(Ni+Si+Mo+Cu)≤0 (2)
• (Here, Cr, Mo, Si, C, N, Ni, Mn and Cu mean the content (% by weight) of each element)