| 摘要 |
PURPOSE:To produce a non-oriented electrical iron sheet having a less iron loss and high magnetic flux density by hot rolling a low-carbon high-silicon slab under sepecific conditions to introduce plastic strain into the rolled sheet then subjecting the sheet to coiling followed by cold rolling and annealing. CONSTITUTION:The slab contg. <0.03% C, <2.0% Si or total content of Si and Al, <1.0% Mn and <0.1% P is heated. The hot rolling is ended at the temp. above the Ar3 transformation point and the hot rolled sheet of which the structure has still fine grained ferrite structure is introduced therein with 3-30% plastic strain by a rolling method, leveler method, pulling tension, etc. and thereafter the sheet is coiled at >=700 deg.C. The coil is pickled after cooling and is descaled. The descaled coil is cold rolled to about 0.5mm. thin sheet which is then annealded at 850 deg.C. The non-oriented electrical iron sheet which has the less iron loss and the high magnetic flux density and is suitable as an iron core material of a rotating material such as motor and a small-sized transformer, etc., is obtd.
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