Austenitic stainless steel having excellent electrical conductivity, and method for manufacturing same
The present disclosure relates to austenitic stainless steel with excellent electrical conductivity in which metal copper is formed in a non-conductive passivation film formed on the surface of stainless steel, and a method of manufacturing the same. The austenitic stainless steel with excellent electrical conductivity according to an embodiment of present disclosure includes: a stainless steel base material comprising, in percent (%) by weight of the entire composition, C: 0.1% or less, Si: 0.1 to 1.0% or less, Mn: 0.1 to 2.0% or less, Cr: 15 to 24% or less, Ni: 6 to 12% or less, Cu: 0.5 to 3% or less, the remainder of iron (Fe) and other inevitable impurities; and a passivation film formed on the stainless steel base material, and the passivation film has a thickness of more than 0 and less than or equal to 5 nm, the Cu weight % content in the thickness region between 2 to 3 nm from the surface of the passivation film is 1.5 or more compared to the Cu weight % content of the stainless steel base material.
1. An austenitic stainless steel comprising:
a stainless steel base material comprising, in percent (%) by weight of the entire composition, C: 0.1% or less, Si: 0.1 to 1.0%, Mn: 0.1 to 2.0%, Cr: 15 to 24%, Ni: 6 to 12%, Cu: 0.5 to 3%, the remainder of iron (Fe) and inevitable impurities; and
a passivation film formed on the stainless steel base material, and
wherein the passivation film has a thickness of more than 0 and less than or equal to 5 nm,
a ratio of a Cu weight % content in a thickness region between 2 to 3 nm from a surface of the passivation film compared to a Cu weight % content of the stainless steel base material is 1.5 or more.
2. The austenitic stainless steel of claim 1 , wherein the passivation film is formed of an oxide containing Fe, Cr, or Ni.
3. The austenitic stainless steel of claim 2 , wherein a contact resistance of the stainless steel is 15 mψcm 2 or less.
4. The austenitic stainless steel of claim 2 , wherein a surface roughness of the stainless steel is 1.13 μm or less.