Hot-rolled steel plate and its manufacturing method

Abstract

This invention discloses a hot-rolled sheet for non-directional electromagnetic steel, wherein the surface region, measured from the rolling surface, extends to a depth of up to 30 µm using X-ray absorption coefficients and converted to Fe-3.5 mass%Si, and is defined as the surface region. The diffraction intensity ratio I220 / (I200+I211+I220) in this surface region is 0.32 or less. The diffraction intensity ratio I110 / I200 in the surface region is preferably 25 or less. The helical differential packing density in the surface region is preferably 3.0×10¹² / m² to 3.0×10¹³ / m².

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