Abstract: A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, in wt %, 2.0 to 6.5% of Si, 0.1 to 1.3% of Al, 0.3 to 2.0% of Mn, and the remainder in Fe and unavoidable impurities, and the area fraction of grains the diameters of which are at most 10% of the sheet thickness is 10.0 to 35.0%, while the number fraction is 15 to 55%.

Abstract: A non-oriented electrical steel sheet according to one embodiment of the present invention comprises a steel sheet base material and an insulation film positioned on the steel sheet base material, satisfies the following formula 2 before stress relief annealing, and satisfies the following formula 3 after stress relief annealing, the steel sheet base material comprising, by wt %, 2.0-6.5% of Si, 0.1-1.3% of Al, 0.3-2.0% of Mn, 0.03% or less of Sn (excluding 0%), 0.02% or less of Sb (excluding 0%) and the balance of Fe and other inevitable impurities and satisfying the following formula 1. 0.03 ? [ Sn ] + [ Sb ] ? 0.005 [ Formula ? 1 ] 0.

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes: a steel sheet base material containing, by wt %: 2.0 to 6.5% of Si, 0.1 to 1.3% of Al, 0.3 to 2.0% of Mn, 0.005 to 0.06% of Cr, and a balance of Fe and other inevitable impurities; and an insulating coating film positioned on the steel sheet base material, wherein Formula 1 below is satisfied before stress relief annealing, and Formula 2 below is satisfied after the stress relief annealing. 0.1 ? [ Mn ? coating ? film ] ? / [ Mn ? 50 ] [ Formula ? 1 ] 10 ? [ Mn ? coating ? film ] ? / [ Mn ? 50 ] ? 1 [ Formula ? 2 ] (in Formulas 1 and 2, [Mn coating film] refers to an average content of Mn (wt %) in the insulating coating film, and [Mn 50] refers to a content of Mn (wt %) at a depth of 50 ?m from an interface between the steel sheet base material and the insulating coating film toward an inside of the steel sheet base material.

Abstract: A humidifying apparatus can include a water tank, and a duct through which water vapor generated in the water tank flows, wherein the water tank includes a bottom plate generating heat, the bottom plate includes a first glass plate disposed within the water tank and a second glass plate disposed below the first glass plate and spaced apart from the first glass plate, and the first glass plate includes a heating layer coated on a lower surface of the first glass plate, and the second glass plate includes a low emissivity layer coated on an upper surface of the second glass plate to suppress heat generated in the heating layer from being transferred to the outside of the second glass plate.