ZN-COATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND THE METHOD FOR MANUFACTURING THE SAME

摘要

There is provided a Zn-coated steel sheet with excellent surface quality, which is generally used for inner and outer panels for automobiles. The Zn-coated steel sheet includes, by weight percent, C: 0.04 to 0.25%, Mn: 0.2 to 2.5%, Si: 0.01 to 1.7%, Al: 0.01 to 1.5%, P: 0.01 to 0.1%, S: 0.02% or less, and Sb: 0.001 to 0.1%, residual Fe, and unavoidable impurities, wherein the Si and Al satisfy 0.5<Si+Al<2.0 and a thickness of an oxide layer on a surface thereof is 1 D or less. The Zn-coated steel sheet may have excellent coating quality in a high strength thin steel sheet having excellent workability.