Cold rolled steel sheet and enameling Enamel
2014
An enameled cold rolled steel sheet, comprising 2 × 102 / mm2 or more, 1 × 104 / mm2 or less having a predetermined chemical composition and a diameter of 0.2μm or more, 10 m or less of Fe-Mn-Nb composite oxide; administering a tensile strain of 10% and a heating temperature of embodiments 830 ℃, a hold time of fatigue limit ratio after the heat treatment for 5 minutes more than 0.42; formed between the tissue and the Fe-Mn-Nb composite oxide voids, the void circle equivalent diameter of 0.1 ~ 0.6μm; when the gap is approximately triangular, the triangular base as a long side, the length of the base value obtained by dividing the height from 1.0 to 15.
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