NON-ORIENTED ELECTROMAGNETIC STEEL SHEET WITH LESS ANISOTROPY

• Main Authors: SHIMAZU TAKAHIDE, ARAI SATOSHI, ABE NORITO, WAKIZAKA TAKEAKI
• Format: Patent
• Language: English
• Published: 05.06.2008
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INDUCTANCES; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSFORMERS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a non-oriented electromagnetic steel sheet which has the optimal magnetic properties as a core of a motor or a transformer, and shows less anisotropy. SOLUTION: A hot-rolled plate of the non-oriented electromagnetic steel sheet has a composition comprising, by mass%, 0.005% or less C, 2 to 4% Si, 1% or less Mn, 0.3 to 2% Al, 0.003 to 0.2% Sn, and the balance Fe with unavoidable impurities. The non-oriented electromagnetic steel sheet with a thickness of 0.1 to 0.3 mm is manufactured by the steps of: subjecting the hot-rolled plate to an annealing step for a hot-rolled plate; cold-rolling the plate once; and subsequently subjecting the sheet to a recrystallization annealing step while controlling the shrinkage percentage of the width of the steel sheet which is being annealed, to 0.5% or less. Then, the steel sheet acquires such magnetic properties that core loss W10/800(L) in a rolled direction (L direction) and core loss W10/800(X) in a direction forming 55 degrees with respect to the rolled direction (X direction) satisfy the expression (1): W10/800(X)/W10/800(L)≤1.20. COPYRIGHT: (C)2008,JPO&INPIT