METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

• Main Author: SHIDARA EITARO
• Format: Patent
• Language: English
• Published: 08.09.2005
• Edition: 7
• 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; 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; TRANSFORMERS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a method for producing a grain-oriented electrical steel sheet by which even in the case of containing much grain boundary segregation elements and high Si content, a magnetic characteristic is not deteriorated and the surface defect can be reduced. SOLUTION: This production method is performed, by which; a step for preparing a starting blank composed by mass ratio of 0.020-0.090% C, 2.0-4.5% Si, 0.02-0.10% Mn, 0.01-0.04% Se and one kind or two or more kinds selected from 0.005-0.50% Cu, 0.01-0.25% Sn and 0.005-0.15% Sb and limiting ≤0.0020% S and the balance Fe except the inevitable impurities; a step for forming a slab forming the recessed part extended in the longitudinal direction in the starting blank; a step for heating the slab to ≥1300°C by charging the slab into a heating furnace; and a step for transporting the heated slab under state of directing the recessed part to the lower side, from the heating furnace to a rough-rolling mill so that the lower surface temperature of the slab at the starting time of the rough-rolling becomes ≥1200°C, are orderly passed through. COPYRIGHT: (C)2005,JPO&NCIPI