WHAT IS CALIMED IS
1. A steel sheet for enamel having no surface defects, comprising:
more than 0 wt% and 0.005 wt% or less of C, 0.1 to 0.5 wt% of Mn, more than 0 wt% and 0.03 wt% or less of Si, 0.05 to 0.3 wt% of Cr, more than 0 wt% and 0.03 wt% or less of Al, 0.03 to 0.1 wt% of O, more than 0 wt% and 0.03 wt% or less of P, more than 0 wt% and 0.02 wt% or less of S, more than 0 wt% and 0.015 wt% or less of Cu, more than 0 wt% and 0.005 wt% or less of N, Fe in a remaining content, and other inevitable impurities.
2. The steel sheet for enamel having no surface defects of claim 1, wherein: a Cr-Mn complex oxide is formed in the steel sheet for enamel.
3. The steel sheet for enamel having no surface defects of claim 2, wherein: an atomic ratio of Cr/Mn in the Cr-Mn complex oxide is in the range of
0.01 to 2.
6. A method of manufacturing a steel sheet for enamel having no surface
defects, comprising:
manufacturing a slab formed of more than 0 wt% and 0.005 wt% or less of C, 0.1 to 0.5 wt% of Mn, more than 0 wt% and 0.03 wt% or less of Si, 0.05 to 0.3 wt% of Cr, more than 0 wt% and 0.03 wt% or less of Al, 0.03 to 0.1 wt% of O, more than 0 wt% and 0.03 wt% or less of P, more than 0 wt% and 0.02 wt% or

less of S, more than 0 wt% and 0.015 wt% or less of Cu, more than 0 wt% and 0.005 wt% or less of N, Fe in a remaining content, and other inevitable impurities;
manufacturing a hot rolled steel sheet by hot rolling after the slab is re¬heated to 1,200°C or more; and
winding the hot rolled steel sheet at 550°C or more.
7. The method of manufacturing a steel sheet for enamel having no surface
defects of claim 6, further comprising:
performing cold rolling at a reduction ratio of 50 to 90% after the winding.
8. The method of manufacturing a steel sheet for enamel having no surface
defects of claim 7, further comprising:
performing continuous annealing of the cold rolled steel sheet at 700°C or more for 20 sec or more after the cold rolling.
9. The method of manufacturing a steel sheet for enamel having no surface
defects of any one of claim 6 to claim 8, wherein:
in the steel sheet for enamel manufactured by the method of manufacturing the steel sheet for enamel, a Cr-Mn complex oxide is formed and an atomic ratio of Cr/Mn in the Cr-Mn complex oxide is 0.01 to 2.

10. The method of manufacturing a steel sheet for enamel having no surface
defects of claim 9, wherein:
in the steel sheet for enamel manufactured by the method of manufacturing the steel sheet for enamel, a size of the Cr-Mn complex oxide is 1 to 25 µm.
11. The method of manufacturing a steel sheet for enamel having no surface
defects of claim 10, wherein:
in the steel sheet for enamel manufactured by the method of manufacturing the steel sheet for enamel, the number of the Cr-Mn complex oxides is 1.5X102 or more per 1 mm2 of an observation view.
12. The method of manufacturing a steel sheet for enamel having no surface
defects of claim 11, wherein:
in the steel sheet for enamel manufactured by the method of manufacturing the steel sheet for enamel, micro-voids are formed in the Cr-Mn complex oxide itself or a periphery thereof.