Hot-rolled non-oriented electrical steel sheet and method for manufacturing same

A non-oriented electrical steel sheet comprising:

• 2.8 to 4.0% of Si, 0.1 to 1.3% of Al, 0.3 to 2.0% of Mn as wt %, a balance of Fe, and inevitable impurities, and satisfying Equation 2 and Equation 3:
• 2
• ⁢
• ❘
• "\[LeftBracketingBar]"
• WL
• -
• WC
• ❘
• "\[RightBracketingBar]"
• /
• (
• WL
• +
• WC
• )
• ≤
• 0.1
• [
• Equation
• ⁢
• 2
• ]
• 2
• ⁢
• ❘
• "\[LeftBracketingBar]"
• WL
• +
• WC
• -
• 2
• ⁢
• WN
• ❘
• "\[RightBracketingBar]"
• /
• (
• WL
• +
• WC
• )
• ≤
• 0.1
• [
• Equation
• ⁢
• 3
• ]
• (in Equation 2 and Equation 3, WL is iron loss (W10/1000, W/kg) measured in a rolling direction, WC is iron loss (W10/1000, W/kg) measured in a vertical direction to the rolling direction, and WN is iron loss (W10/1000, W/kg) measured in the direction forming the angle of 45 degrees with respect to the rolling direction. W10/1000 is iron loss (W/kg) when flux density of 1.0 T is induced at a frequency of 1000 Hz.)

A method for manufacturing a hot rolled non-oriented electrical steel sheet comprising:

• manufacturing a hot rolled plate by hot rolling a slab including 2.8 to 4.0% of Si, 0.1 to 1.3% of Al, 0.3 to 2.0% of Mn as wt %, a balance of Fe, and inevitable impurities;
• and
• removing a scale existing on a surface of the hot rolled plate,
• wherein the removing of a scale includes removing a scale by projecting a shot ball on to a steel sheet, and
• Equation 1 is satisfied after projecting a shot ball:
• 1.1
• ≤
• Hv
• ⁢
• 1
• /
• HV
• ⁢
• 2
• ≤
• 1.5
• [
• Equation
• ⁢
• 1
• ]
• (here, Hv1 is hardness measured on the surface of steel sheet, and Hv2 is hardness measured at the ½ of the thickness of the steel sheet.)