Anisotropic electromagnetic steel sheet and method for producing same

• Main Authors: FUJIKURA MASAHIRO, ATAKE MAKOTO, USHIGAMI YOSHIYUKI, KANAO SHINICHI, HORI KOJIRO, ICHIE TAKERU, MURAKAWA TESSHU
• Format: Patent
• Language: Chinese; English
• Published: 16.07.2014
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INDUCTANCES; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Provided is an anisotropic electromagnetic steel sheet comprising, by mass%, 0.005% or less of C, 0.1% to 2.0% of Si, 0.05 to 0.6% of Mn, 0.100% or less of P, and 0.5% or less of Al, wherein the content of nonmagnetic precipitate AlN having an average diameter of 10 to 200 nm is, by number density,10 precipitates/[mu]m or less, and the average flux density in the rolling direction and the direction perpendicular to rolling is 1.75 T or greater. This anisotropic electromagnetic steel sheet can be produced by two methods, the method of hot rolling and annealing at a temperature between 750 DEG C and the Ac1 transformation temperature and the method of self-annealing at a coil take-up temperature of 780 DEG C or greater.