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Nonoriented electromagnetic steel sheet
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An electromagnetic steel plate and non-directional technology, applied in the direction of inorganic materials, circuits, magnetic materials, etc., can solve the problems of iron loss degradation and achieve excellent iron loss effect
Active Publication Date: 2014-02-12
NIPPON STEEL CORP
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[0007] However, the inventors have studied the technology disclosed in the above-mentioned Patent Document in detail, and as a result, found that in the technology of Patent Document 1, the iron loss is good at a frequency above a certain frequency, for example, 3000 Hz, but it is poor at a low frequency such as 800 Hz. The problem of iron loss deterioration with the increase of Cr addition
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Embodiment 1）
[0056] First, a hot-rolled sheet containing C: 0.002% by mass, S: 0.002% by mass, N: 0.002% by mass, and Mn: 0.3% by mass, Si, Al, and Cr having the composition shown in Table 1 below was prepared and pickled. A cold-rolled sheet having a thickness of 0.25 mm was obtained by cold rolling. Next, the oxygen potential was controlled under the conditions shown in Table 1, and finish annealing was performed at 1000° C. to obtain a non-oriented electrical steel sheet.
[0057] Table 1
[0058]
[0059] Next, samples for magnetic measurement were cut out from the obtained non-oriented electrical steel sheet, and iron loss W10 / 3000 at 3000 Hz and 1T and iron loss W10 / 800 at 800 Hz and 1T were measured. In addition, a sample for observation was cut out, and the cross section of the non-oriented electrical steel sheet was observed. As an observation method, SEM and GDS were used to measure the thickness of the Cr oxide layer. As a result, the thickness of the Cr oxide layer is sho...
Embodiment 2）
[0064] First, a hot-rolled sheet containing C: 0.002% by mass, S: 0.002% by mass, N: 0.002% by mass, and Mn: 0.3% by mass, Si, Al, and Cr as components A to L shown in Table 3 below was prepared. , pickled, and cold-rolled to obtain a cold-rolled sheet with a thickness of 0.15 mm to 0.30 mm. Next, finish annealing at 1000° C. was performed in a dry hydrogen atmosphere. The oxygen potential P at this time H2O / P H2 3×10 at 300-500°C during heating －4 , 1×10 in soaking －4 , to obtain a non-oriented electrical steel sheet.
[0065] table 3
[0066]
[0067] Next, samples for magnetic measurement were cut out from the obtained non-oriented electrical steel sheet, and iron loss W10 / 3000 at 3000 Hz and 1T, iron loss W10 / 800 at 800 Hz and 1T, and iron loss W10 / 400 at 400 Hz and 1T were measured. In addition, the thickness of the Cr oxide layer was measured in the same procedure as in Example 1. As a result, the thickness of the Cr oxide layer was in the range of 0.01 μm to 0...
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Abstract
A nonoriented electromagnetic steel sheet characterized by comprising 0.005 percent by mass or less of C, 0.003 percent by mass or less of S, 2.0 percent by mass or more and less than 4.5 percent by mass of Si, 0.15 percent by mass or more and less than 2.5 percent by mass of Al, and 0.3 percent by mass or more and less than 5.0 percent by mass of Cr, the remainder comprising Fe and impurities; the nonoriented electromagnetic steel sheet having a chromium-oxide-containing layer measuring 0.01 to 0.5 mum in thickness on the outer surface; and satisfying the relationships of 10 percent by mass<=2 [Si]+2 [Al]+[Cr]<15 percent by mass and (2[Al]+[Cr]) / 2[Si]-10t 2<=0.35, where [Si], [Al], and [Cr] refer respectively to the Si content, the Al content, and the Cr content (expressed as a percentage of mass) of the nonoriented electromagnetic steel sheet, and t refers to the thickness (mm) of the nonoriented electromagnetic steel sheet.
Description
technical field [0001] The present invention relates to a non-oriented electrical steel sheet suitable as a material for an engine core, particularly an engine core driven by high-speed rotation or high frequency such as an electric vehicle or a hybrid vehicle. Background technique [0002] In recent years, electric vehicles and hybrid vehicles have spread widely, and high-speed rotation of driving motors used in these vehicles has been progressing, and at the same time, high-frequency driving using inverters has been progressing. In order to achieve high-speed rotation and high-frequency driving, it has been required to reduce high-frequency iron loss in non-oriented electrical steel sheets used as engine cores. [0003] In order to reduce the high-frequency iron loss of the non-oriented electrical steel sheet, it is effective to provide a high intrinsic resistance due to high alloying while reducing the thickness of the sheet. However, if the plate thickness is reduced, t...
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