Non-oriented electromagnetic steel sheet, method for producing same and motor core
An electromagnetic steel plate and non-directional technology, which is applied in the field of motor cores, can solve the problems of reduced magnetic flux density and not necessarily improved fatigue strength, and achieves the effect of high fatigue strength
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Embodiment 1
[0109] Steels having various compositions shown in Table 1 are smelted by a generally known method, and continuously cast to form a slab (slab material) with a wall thickness of 230 mm, and then hot rolled the slab to obtain a slab with a thickness of 2.0 mm of hot-rolled plate. Next, the hot-rolled sheet was subjected to hot-rolled sheet annealing and pickling by a generally known method, and then cold-rolled to produce cold-rolled sheets of various thicknesses shown in Table 2.
[0110] Next, the cold-rolled sheet was subjected to cold-rolled sheet annealing under the conditions shown in Table 2, and an insulating coating was applied by a generally known method to obtain a cold-rolled annealed sheet.
[0111] Next, heat treatment was performed on the cold-rolled annealed sheet at the annealing temperature shown in Table 2 for 1 hour to prepare a heat-treated sheet.
[0112] The cold-rolled and annealed sheets and heat-treated sheets thus obtained were subjected to the follo...
Embodiment 2
[0126] Slabs (slabs) of steel codes A, M, and N having different Al contents and Zn contents shown in Table 1 were hot-rolled under the same conditions as in Example 1 to obtain a hot-rolled sheet with a thickness of 2.0 mm. After performing hot-rolled sheet annealing and pickling, cold-rolled to produce a cold-rolled sheet with a thickness of 0.25 mm.
[0127] Next, the cold-rolled sheet was subjected to cold-rolled sheet annealing under the conditions shown in Table 3, and an insulating coating was applied to obtain a cold-rolled annealed sheet. At this time, the average temperature increase rate between 500° C. and 700° C. in the heating process for annealing the cold-rolled sheet was varied in various ways.
[0128] Next, heat treatment was performed on the cold-rolled annealed sheet at the annealing temperature shown in Table 3 for 1 hour to prepare a heat-treated sheet.
[0129] The cold-rolled annealed sheet and the heat-treated sheet obtained in this way were subjecte...
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