| 摘要 |
PURPOSE: To obtain a quenched thin metallic strip reduced in air pocket and excellent in magnetic characteristic and occupying vol. rate by periodically forming the specific shapes of recessed part and projecting part on the surface of a cooling base plate for quenching molten alloy. CONSTITUTION: In a producing apparatus of the quenched thin metallic strip, on the surface of the cooling base plate in contact with the molten metal, the continuous recessed parts or projecting parts having >=100μm length in the rotating direction of the cooling base plate are formed alternately and periodically in the rotating axial direction. The molten metal is spouted on the cooling base plate to produce the quenched thin metallic strip. By this method, at least on one side surface of the thin metallic strip, the continuous recessed parts or projecting parts having a length of >=100μm in parallel to the longitudinal direction are formed. These recessed parts or projecting parts are alternately and periodically arranged to the width direction of the thin strip. Further, the range of the recessed parts and the projecting parts are made to occupy at least >=70% on one side surface. Gas entrapped in the molten metal is exhausted through the grooves formed with the recessed parts or the projecting parts before solidifying the molten metal.
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