Non-Oriented Electrical Steel Sheet Having Superior Magnetic Properties and a Production Method Therefor

A method of producing a non-oriented electrical steel sheet having superior magnetic properties, comprising subjecting a slab comprising 0.7˜3.0% of Al, 0.2˜3.5% of Si, 0.2˜2.0% of Mn, 0.001˜0.004% of N, 0.0005˜0.004% of S, and a balance of Fe and other inevitable impurities by wt % and satisfying at least one of Conditions (1), (2) and (3) below to heating, hot rolling, cold rolling, and final annealing at 750˜1100° C.:

• Condition (1):
• 0.7≦[Al]≦2.7, 0.2≦[Si]≦1.0, 0.2≦[Mn]≦1.7, {[Al]+[Mn]}≦2.0, 0.002≦{[N]+[S]}≦≦0.006, 230≦{([Al]+[Mn])/([N]+[S])}≦1,000;
• Condition (2):
• 1.0≦[Al]≦3.0, 0.5≦[Si]≦2.5, 0.5≦[Mn]≦2.0, {[Al]+[Mn]}≦3.5, 0.002≦{[N]+[S]}≦0.006, 300≦{([Al]+[Mn])/([N]+[S])}≦1,400;
• and
• Condition (3):
• 1.0≦[Al]≦3.0, 2.3≦[Si]≦3.5, 0.5≦[Mn]≦2.0, {[Al]+[Mn]}≦3.5, 0.002≦{[N]+[S]}≦0.006, 300≦{([Al]+[Mn])/([N]+[S])}≦1,400,
• wherein [Al], [Si], [Mn], [N] and [S] indicate amounts (wt %) of Al, Si, Mn, N and S, respectively.

A non-oriented electrical steel sheet slab, comprising 0.7˜3.0% of Al, 0.2˜3.5% of Si, 0.2˜2.0% of Mn, 0.001˜0.004% of N, 0.0005˜0.004% of S, and a balance of Fe and other inevitable impurities by wt %, and satisfying at least one of Conditions (1), (2) and (3) below:

• Condition (1):
• 0.7≦[Al]≦2.7, 0.2≦[Si]≦1.0, 0.2≦[Mn]≦1.7, {[Al]+[Mn]}≦2.0, 0.002≦{[N]+[S]}≦0.006, 230≦{([Al]+[Mn])/([N]+[S])}≦1,000;
• Condition (2):
• 1.0≦[Al]≦3.0, 0.5≦[Si]≦2.5, 0.5≦[Mn]≦2.0, {[Al]+[Mn]}≦3.5, 0.002≦{[N]+[S]}≦0.006, 300≦{([Al]+[Mn])/([N]+[S])}≦1,400;
• and
• Condition (3):
• 1.0≦[Al]≦3.0, 2.3≦[Si]≦3.5, 0.5≦[Mn]≦2.0, {[Al]+[Mn]}≦3.5, 0.002≦{[N]+[S]}≦0.006, 300≦{([Al]+[Mn])/([N]+[S])}≦1,400,
• wherein [Al], [Si], [Mn], [N] and [S] indicate amounts (wt %) of Al, Si, Mn, N and S, respectively.

A method of producing a non-oriented electrical steel sheet slab, comprising adding 0.3˜0.5% of Al to molten steel to perform deoxidation, adding a remainder of Al and Si and Mn, and maintaining a temperature of the molten steel at 1,500˜1,600° C., thus obtaining the slab comprising 0.7˜3.0% of Al, 0.2˜3.5% of Si, 0.2˜2.0% of Mn, 0.001˜0.004% of N, 0.0005˜0.004% of S, and a balance of Fe and other inevitable impurities by wt %, and satisfying at least one of Conditions (1), (2) and (3) below:

• Condition (1):
• 0.7≦[Al]≦2.7, 0.2≦[Si]≦1.0, 0.2≦[Mn]≦1.7, {[Al]+[Mn]}≦2.0, 0.002≦{[N]+[S]}≦0.006, 230≦{([Al]+[Mn])/([N]+[S])}≦1,000;
• Condition (2):
• 1.0≦[Al]≦3.0, 0.5≦[Si]≦2.5, 0.5≦[Mn]≦2.0, {[Al]+[Mn]}≦3.5, 0.002≦{[N]+[S]}≦0.006, 300≦{([Al]+[Mn])/([N]+[S])}≦1,400;
• and
• Condition (3):
• 1.0≦[Al]≦3.0, 2.3[Si]≦3.5, 0.5≦[Mn]≦2.0, {[Al]+[Mn]}≦3.5, 0.002≦{[N]+[S]}≦0.006, 300≦{([Al]+[Mn])/([N]+[S])}≦1,400,
• wherein [Al], [Si], [Mn], [N] and [S] indicate amounts (wt %) of Al, Si, Mn, N and S, respectively.