JPH0471989B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Field of Application> The present invention relates to a semi-processed non-oriented electrical steel sheet that can be used as a core material for small and medium-sized motors or transformers to meet the recent demands for energy conservation, and has particularly low iron loss and high magnetic permeability. be. <Prior Art> Conventionally, in order to reduce iron loss in non-oriented electrical steel sheets, measures have been taken to add Si and Al to increase the specific resistance of the sheets and reduce eddy current loss. However, although the addition of these elements is effective in reducing iron loss, it has the disadvantage of decreasing magnetic permeability. Therefore, in Japanese Patent Publication No. 56-34616, it is proposed that the decrease in magnetic permeability is relatively small even though the specific resistance is increased by changing to Si and Al.
The effectiveness of Mn addition has been proposed. However, even with this method, the magnetic permeability deteriorates slightly. Furthermore, JP-A No. 61-67753 proposes the addition of Cu to reduce iron loss by improving the texture. However, even with this method, it is difficult to stably improve magnetic permeability. Also, since Cu has a low melting point, it has the disadvantage of causing hot brittle cracking. <Problems to be solved by the invention> As described above, it is extremely difficult to reduce iron loss and increase magnetic permeability with conventional semi-processed non-oriented electrical steel sheets, and methods such as adding Cu can almost satisfy this problem. Even in the case of rolling, problems with hot rolling properties remained. In order to solve the above problem, the present inventors previously proposed in Japanese Patent Application No. 150208/1982 (Japanese Unexamined Patent Publication No. 317627/1983) a semi-conductor with low iron loss and high magnetic permeability characterized by the addition of Ni. Although a processed electrical steel sheet and a method for manufacturing the same have been proposed, it is an object of the present invention to provide a semi-processed electrical steel sheet with even better characteristics. <Means for solving the problem> In order to simultaneously improve iron loss and magnetic permeability, the present inventors have been conducting research on steel sheets having a texture mainly consisting of {100} and {110}, which are more advantageous for magnetic properties. Ta. As a result, Ni and Cr, which were previously thought to be harmful to magnetism, were replaced, as stated in "Silicon Steel Sheet", published by Corona Publishing, 1955, co-authored by Gokyu and Abe, page 75.
We have discovered that by adding an appropriate amount of Mn to steel with increased Mn content, it is possible to actually reduce iron loss and improve magnetic permeability. The present invention is based on this knowledge: C: 0.020 wt or less Si: 0.2 to 1.5 wt% Al: 0.15 to 0.60 wt% P: 0.02 to 0.10 wt% Mn: 1.0 to 1.5 wt% Ni: 0.1 to 1.0 Semi-processed non-directional electromagnetic material with low iron loss and high magnetic permeability characterized by a composition containing wt% Cr: 0.05 to 0.50 wt% and S: 0.08 wt% or less, with the remainder essentially consisting of Fe. It is a steel plate. In addition to the above basic components, the present invention further contains one or two of Sb and Sn in a total amount of 0.01 to 0.2wt.
%, Cu: 0.6wt% or less and B: 0.001 to 0.004wt
%, or a combination of one or more of Sb and Sn with Cu or B, or one or more of Sb and Sn.
A combination of Cu and B can be added within the above-mentioned content ranges. <Function> Next, the present invention will be explained in detail based on experimental results. Based on steels A and B having the compositions shown in Table 1, slabs with varying amounts of Cr added were hot-rolled, and after annealing at a temperature of 800°C for 30 minutes,
It was cold rolled to a thickness of 0.54 mm, further subjected to continuous annealing at a temperature of 750°C for 1 minute, and then subjected to skin pass rolling to a thickness of 0.50 mm to obtain a product. The steel plate was sheared to Epstein size and heated at 750℃.
Figure 1 shows the magnetic properties after strain relief annealing in an N ₂ atmosphere for 2 hours. As is clear from this, Ni
Even if a small amount of Cr is added to steel A, which is an additive-free material, the properties will only slightly deteriorate, but when Cr is added to steel B, which is a Ni-added material, iron loss increases with addition of 0.05% or more. decreases, and magnetic permeability also increases.

[Table] Next, the reasons for limiting the ingredients will be explained. C is very harmful in terms of magnetic properties, forming carbides and causing significant deterioration of iron loss and magnetic permeability, so it must be kept at 0.020% or less. Si needs to be 0.2% or more to exhibit the effect of reducing iron loss, but if it exceeds 1.5%, the magnetic permeability deteriorates, so it needs to be 0.2% or more and 1.5% or less. Al, like Si, is also necessary for lowering iron loss, and in order to achieve this effect, it is sufficient to contain 0.15% or more, and if it exceeds 0.6%, the magnetic permeability deteriorates, so 0.15% or more and 0.6% It is necessary to do the following. P needs to be 0.02% or more to exhibit the effect of reducing iron loss, but if it exceeds 0.10%, the magnetic permeability deteriorates, so it needs to be 0.02% or more and 0.10% or less. Like Si and Al, Mn also has the effect of increasing specific resistance. If the Ni content is 1.0% or more, adding Ni has the effect of improving the texture, but 1.5%
If it exceeds 1.0% or more, the magnetic permeability will deteriorate, so 1.5
% or less. Ni develops a texture that is favorable for magnetic properties, but if it is less than 0.1%, the effect is small, and even if it exceeds 1.0%, the amount of iron loss reduction and magnetic permeability improvement is small relative to the cost, so 0.1% or more and 1.0% or less limited to. Cr was previously thought to be harmful to magnetism, but its combined effect with Ni lowers iron loss and improves magnetic permeability. However, if it is added less than 0.05%, the effect is small, and if it exceeds 0.5%, the effect becomes saturated, so it is limited to 0.05% or more and 0.5% or less. S forms inclusions such as MnS,
It must be kept at 0.008% or less because it impairs the growth of crystal grains and impedes the movement of domain walls, thereby degrading magnetic properties. In addition, in the present invention, in addition to the above basic components, Sb,
Sn, Cu, and B can be added. Sb and Sn are components that prevent surface oxidation and nitridation and may be added, but if they are used alone or in combination less than 0.01%, the effect is small and if they exceed 0.2%, the magnetic properties deteriorate. In addition to this, Cu may be added to increase specific resistance and reduce eddy current loss. However, from the viewpoint of magnetic properties, it is desirable that the content be 0.6% or less. In addition, with regard to hot embrittlement, which is a problem when Cu is added alone, Ni of 0.1% or more is added.
As long as Ni is included, there is no problem because Ni has the effect of increasing the melting point of Cu. In addition, when strain relief annealing is performed in a decarburizing atmosphere at the customer's end, B, which has the effect of preventing embrittlement, may be added instead of C. 0.001% or more 0.004%
It is effective within the following range. In addition, when adding B, if Al is less than 0.15%, B nitrides will precipitate and B's grain boundary embrittlement suppressing effect will be lost; however, in the present invention, Al is contained as an essential component in an amount of 0.15% or more. There is no need to worry about that. Next, regarding the manufacturing method, a normal semi-processed non-oriented electrical steel sheet manufacturing process can be applied. That is,
After hot rolling a slab made of the component system of the present invention and winding it into a coil, it is preferably annealed at a temperature range of 700 to 950°C for 2 minutes or more, and then cold rolled at a rolling reduction of 40% or more. The product is generally produced by annealing in a non-oxidizing atmosphere at a temperature range of 650 to 1000°C, followed by applying a light pressure of 2 to 10%. <Example> Table 2 shows the composition of the materials used in the experiment, and the slag made from these compositions was hot-rolled, annealed at 800℃ for 30 minutes, cold-rolled to 0.54 mm, and heated with N at 750℃ for 1 minute. ₂ atmosphere, followed by cold rolling to 0.50 mm, punching into Epstein pieces, and strain relief annealing at 750° C. for 2 hours in N ₂ atmosphere. From this table, it can be seen that under the conditions of the present invention, excellent properties in both iron loss and magnetic permeability were obtained. In addition, regarding steels 3, 4, 7, and 8,

[Table] A 0.50 mm Epstein after skin pass obtained in the same manner as in [Table] was annealed at a temperature of 790°C for 2 hours in a decarburizing atmosphere with a dew point of 25°C, and the bend characteristics were measured. Table 3 shows the results. From this table, it can be seen that the B additive material has excellent bending properties.

[Table] Here, the bending characteristics are 30mm x according to JISC2550.
It was determined by placing a 280 mm sized test piece in a metal tester with a radius of 5 mm, and measuring the number of times it was bent until cracking occurred due to repeated bending. <Effects of the Invention> According to the present invention, a semi-processed non-oriented electrical steel sheet with significantly reduced core loss and excellent magnetic permeability can be obtained, and therefore has great industrial benefits.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the effect of Cr addition on iron loss and magnetic permeability depending on the presence or absence of Ni addition.

Claims (1)

[Claims] 1 C: 0.020 wt% or less Si: 0.2 to 1.5 wt% Al: 0.15 to 0.60 wt% P: 0.02 to 0.10 wt% Mn: 1.0 to 1.5 wt% Ni: 0.1 to 1.0 wt% Cr: A semi-processed non-oriented electrical steel sheet having low iron loss and high magnetic permeability, characterized in that it contains 0.05 to 0.50 wt% and S: 0.008 wt% or less, with the remainder substantially consisting of Fe. 2 C: 0.020 wt% or less Si: 0.2 to 1.5 wt% Al: 0.15 to 0.60 wt% P: 0.02 to 0.10 wt% Mn: 1.0 to 1.5 wt% Ni: 0.1 to 1.0 wt% Cr: 0.05 to 0.50 wt% and S: Contains 0.008 wt% or less, and also contains one or both of Sb and Sn in total.
A semi-processed non-oriented electrical steel sheet with low iron loss and high magnetic permeability, characterized in that it contains 0.01 to 0.2 wt%, with the remainder substantially consisting of Fe. 3 C: 0.020 wt% or less Si: 0.2-1.5 wt% Al: 0.15-0.60 wt% P: 0.02-0.10 wt% Mn: 1.0-1.5 wt% Ni: 0.1-1.0 wt% Cr: 0.05-0.50 wt% and A semi-processed non-oriented electrical steel sheet with low iron loss and high magnetic permeability, characterized in that it contains S: 0.008 wt% or less, Cu: 0.6 wt% or less, and the balance is substantially Fe. 4 C: 0.020 wt% or less Si: 0.2 to 1.5 wt% Al: 0.15 to 0.60 wt% P: 0.02 to 0.10 wt% Mn: 1.0 to 1.5 wt% Ni: 0.1 to 1.0 wt% Cr: 0.05 to 0.50 wt% and A semi-processed non-oriented electrical steel sheet with low iron loss and high magnetic permeability, characterized in that it contains S: 0.008 wt% or less, B: 0.001 to 0.004 wt%, and the remainder is substantially Fe. 5 C: 0.020 wt% or less Si: 0.2-1.5 wt% Al: 0.15-0.60 wt% P: 0.02-0.10 wt% Mn: 1.0-1.5 wt% Ni: 0.1-1.0 wt% Cr: 0.05-0.50 wt% and S: Contains 0.008 wt% or less, and also contains one or both of Sb and Sn in total.
A semi-processed non-oriented electrical steel sheet with low iron loss and high magnetic permeability, characterized by containing 0.01 to 0.2 wt% and Cu: 0.6 wt% or less, with the remainder substantially consisting of Fe. 6 C: 0.020 wt% or less Si: 0.2-1.5 wt% Al: 0.15-0.60 wt% P: 0.02-0.10 wt% Mn: 1.0-1.5 wt% Ni: 0.1-1.0 wt% Cr: 0.05-0.50 wt% and S: Contains 0.008 wt% or less, and also contains one or both of Sb and Sn in total.
0.01-0.2wt%, Cu: 0.6wt% or less and B:
A semi-processed non-oriented electrical steel sheet having a low iron content and high magnetic permeability, characterized in that it contains 0.001 to 0.004 wt%, with the remainder substantially consisting of Fe.