Acid-resistant steel sheet and manufacturing method therefor
An acid-resistant steel sheet according to an embodiment of the present invention includes, by wt %, equal to or less than 0.1% of C (excluding 0%) and 2.0 to 4.0% of Si, and includes a remainder of Fe and inevitable impurities, and the content of Si of the surface portion by the inward depth of up to 10 μm from the surface of the steel sheet is equal to or greater than 15 wt %.
1. An acid-resistant hot-rolled steel sheet comprising,
by wt %, equal to or less than 0.1% of C excluding 0% and 2.0 to 4.0% of Si, and a remainder of Fe and inevitable impurities,
wherein the content of Si of the surface portion by the inward depth of up to 10 μm from the surface of the steel sheet is equal to or greater than 15 wt %.
2. The acid-resistant hot-rolled steel sheet of claim 1 , further comprising
at least one of 0.1 to 0.5 wt % of Mn, equal to or less than 0.1 wt % of Al, equal to or less than 0.01 wt % of P, equal to or less than 0.01 wt % of S, and equal to or less than 0.01 wt % of N.
3. The acid-resistant hot-rolled steel sheet of claim 1 , further comprising
equal to or less than 0.1 wt % of Cr, equal to or less than 0.1 wt % of Ni, equal to or less than 0.1 wt % of Cu, equal to or less than 0.1 wt % of Nb, and equal to or less than 0.1 wt % of Mo.
4. The acid-resistant hot-rolled steel sheet of claim 1 , wherein
when soaked for an hour in a 1 wt % sulfuric acid solution at 70° C., an average corrosion rate is equal to or less than 3.5 mg/cm 2 ·h.
5. The acid-resistant hot-rolled steel sheet of claim 1 , wherein
an elongation rate is equal to or greater than 30%.