COLD ROLLED STEEL SHEET AND HOT DIP ZINC-BASED PLATED STEEL SHEET HAVING EXCELLENT BAKE HARDENABILITY AND CORROSIONRESISTANCE AND METHOD FOR MANUFACTURING THE SAME

摘要

% By weight of carbon (C): 0.005-0.08%; Manganese (Mn): 1.25% or less (excluding 0%); Phosphorus (P): 0.03% or less (excluding 0%); Sulfur (S): 0.01% or less (excluding 0%); Nitrogen (N): 0.01% or less (excluding 0%); Aluminum (sol.Al): 0.01 to 0.06%; Chromium (Cr): 1.0% to 2.5%; Antimony (Sb): 0.1% or less (excluding 0%); Ni: 0.3% or less (excluding 0%), Si: 0.3% or less (excluding 0%), Mo: 0.2% or less (excluding 0%) and B: It contains at least one selected from the group consisting of 0.003% or less (excluding 0%), residual iron (Fe) and unavoidable impurities, satisfying the following relation 1, 1% to 5% martensite and residual ferrite in area% It provides a cold-rolled steel sheet having excellent baking hardening and corrosion resistance, including a hot-dip galvanized steel sheet using the same and a method of manufacturing the same. [Relationship 1] 1.3≤Mn (wt%) + Cr (wt%) / 1.5 + Sb (wt%) ≤2.7 Where Mn, Cr, and Sb each represent the content (% by weight) of the element.