HOT ROLLED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE BY SULFURIC ACID AND HYDROCHLORIC ACID AND METHOD FOR MANUFACTURING THE SAME

摘要

A hot-rolled steel sheet excellent in sulfuric acid and hydrochloric acid combined corrosion resistance and a method for producing the same. A hot rolled steel sheet excellent in sulfuric acid and hydrochloric acid composite corrosion resistance, which is one aspect of the present invention, contains 0.05 to 0.1% of C, 0.5 to 1.5% of Mn, 0.02% or less of P, To about 0.1% of Cu, about 0.2 to about 0.7% of Cu, about 0.05 to about 0.1% of Sb, and the balance of Fe and other unavoidable impurities, wherein Cu and Sb are concentrated within 500 nm from the surface in the thickness direction.