NON-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Abstract: the present disclosure provides a method of manufacturing a non-oriented electrical steel sheet, the method including preparing a slab comprising, by weight %, carbon (c): more than 0% but not more than 0.002%, silicon (si): 2.3% to 2.8%, manganese (mn): 0.2% to 0.28%, aluminum (ai): 0.32% to 0.45%, phosphorus (p): more than 0% but not more than 0.015%, sulfur(s): more than 0% but not more than 0.002%, nitrogen (n): more than 0% but not more than 0.005%, titanium (ti): more than 0% but not more than 0.002%, a balance of iron (fe), and inevitable impurities; forming a hot-rolled sheet by hot rolling the slab, forming a hot-rolled annealed sheet by preliminarily annealing the hot-rolled sheet, forming a cold-rolled sheet by cold rolling the hot-rolled annealed sheet, and forming a cold-rolled annealed sheet by cold annealing the cold-rolled sheet, wherein manganese (mn) and aluminum (ai) included in the slab satisfy equation 1 (0.10≤1.3�[mn]−0.46�[al]≤0.18).

Inventor(s): Han Hyuk Cho, Chun Ku Kang

CPC Classification: C21D9/46 (MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class and at least one process covered by this subclass ; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials ))

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