JP5211434B2 - Electrical steel sheet with good film adhesion and excellent magnetic properties, its production method and method of use - Google Patents

Description

  The present invention relates to an electrical steel sheet having a good film and a significant reduction in iron loss by a simple film formation process, a method for producing the same, and a method for using the same.

  Magnetic steel sheets used for motors and transformers are usually used by being laminated, but if the laminated steel sheets are electrically short-circuited, the characteristics of the members will deteriorate, especially iron loss will increase. As shown in Document 1, an insulating film is formed on the surface of the steel sheet. This insulation film is intended to improve the iron loss by applying tension to the base steel sheet, to prevent slippage when processing the steel sheet to make motor parts and transformer parts, and to generate rust on the parts in use. Improvement of corrosion resistance to suppress it is also expected as one of the effects. In order to share these purposes, it is common practice to form a plurality of different types of films. For these purposes, an oxide is often used as a material for forming this film. In particular, an oxide mainly composed of Si is often used to satisfy the above characteristics and cost.

  However, the oxide-based coatings that have been put to practical use so far are difficult to improve the adhesion with the base metal plate, which is a metal. With the current technology, the interface between the metal and the oxide has a large uneven shape. In other words, it was a mechanically joined state with a so-called anchor effect. The unevenness on the outermost surface of the base steel plate inhibits the movement of the domain wall that moves in the base steel plate during use of the steel plate, and thus causes a significant deterioration in magnetic properties. In order to eliminate such harm, a technique such as that of Patent Document 2 in which the interface between the steel sheet and the film is flat and the adhesion is enhanced by an effect similar to that of a general adhesive by using an organic substance containing adhesion in the film. Is also disclosed. However, this technique has a drawback in that it is difficult to increase the tension applied to the mother steel sheet, and the effect of improving the magnetic properties due to the tension cannot be fully utilized.

  On the other hand, in order to laminate and fix electromagnetic steel sheets, welding and caulking are often applied, but steel sheet short-circuiting due to these and generation of undesirable strain cause deterioration of properties as a member. It has been pointed out that For this reason, the technique like patent document 3 which fixes as a laminated member by using the organic substance fuse | melted at high temperature like an adhesive agent, ie, heat-processing at high temperature, with the steel plate piled up is also disclosed. However, with this technology, the adhesive strength is weak, and the adhesive strength decreases extremely due to the temperature of the high temperature state where the member is exposed for various purposes in the process of manufacturing the member, and due to aging over time. Has been pointed out to cause problems.

JP-A-2-301571 JP-A-7-278833 JP 2000-12320 A

  The object of the present invention is to realize both low cost and the adhesion of the coating that could not be achieved by the former method and the application of tension to the base steel sheet, and at the same time to securely fix the laminated steel sheet as a member. And

  The present invention achieves the above object by preferably controlling the structure and composition of a film mainly composed of an oxide. More specifically, the characteristics of the film are remarkably improved by containing one or more of Ni, Co, Cr, Cu, Mo, Nb, and Mn in the material to be applied as the film. In particular, by segregating these elements at the interface between the film and the mother steel plate, and by forming the concentrated portion unevenly distributed on the interface, the interface is made very fine asperities and at the same time the chemical bonding force is improved, As a result, the adhesion of the film to the steel sheet is improved. The segregation of Ni, Co, Cr, Cu, Mo, Nb, and Mn occurs efficiently by optimally controlling the substances added to the film, the amount thereof, and the heat treatment applied to the film. Furthermore, in order to make the most of the overall cost reduction of the member using the steel plate and the effect of the invention, the process of assembling the member using the steel plate is utilized as the film forming step. The gist of the present invention is as follows.

(1) The mother steel plate is in mass%, C: 0.070% or less (including 0), Si: 7.00% or less (including 0), Mn: 6.50% or less (including 0), P: 0.30% or less (including 0), S: 0.080% or less (including 0), Al: 8.0% or less (including 0), N: 0.070% or less (including 0) ), O: 0.070% or less (including 0), a steel sheet comprising the balance Fe and unavoidable impurities, and having a film containing an oxide on the surface, SiO in the film ₂ 30 mass% or more, oxide is 70 mass% or more, further, in the coating, as a specific element, Ni, Co, Cr, Cu , Mo, Nb, Mn one or two or more, mass %: Ni: 0.05% or more, Co: 0.05% or more, Cr: 0.05% or more, Cu: 0.05% or more, Mo: 0 0.05% or more, Nb: 0.05% or more, Mn: it contains 0.05% or more ranges, for the concentration of the specific elements, (each element concentration of thickening site at the interface of the base steel and the film) / (each element in the base steel mean concentration) ≧ 2.0, and (the element concentration of thickening site at the interface of the base steel and the film) / (the elements mean concentration ≧ 2.0 in the film, Shi meet And the density | concentration of the concentration site | part in the interface of the mother steel plate of the said specific element and a film | membrane is 0.10 mass% or more , The magnetic steel sheet excellent in the film | membrane adhesiveness and excellent in the magnetic characteristic.

(2) base steel and the average depth of the irregularities of the interface of the film is equal to or less than 5.0 .mu.m (1) Symbol mounting electrical steel sheet film adhesion was excellent good magnetic properties of the.

( 3 ) The electrical steel sheet having good film adhesion and excellent magnetic properties according to (1) or (2) , wherein the average period of irregularities at the interface between the base steel sheet and the film is 15.0 μm or less.

( 4 ) One or more elements of Ni, Co, Cr, Cu, Mo, Nb, and Mn are (average concentration of each element in the film) / (average concentration of each element in the base steel plate)> 1.00 The electrical steel sheet having good film adhesion and excellent magnetic properties according to any one of (1) to ( 3 ).

( 5 ) The electrical steel sheet having good film adhesion and excellent magnetic properties according to any one of (1) to ( 4 ), wherein the average thickness of the film is 20.0 μm or less.

( 6 ) (Average thickness of coating) / (Thickness of steel plate) ≦ 1/10 Good coating film adhesion according to any one of (1) to ( 5 ) and magnetic properties Excellent electrical steel sheet.

( 7 ) The film has a good adhesiveness and excellent magnetic properties according to any one of (1) to ( 6 ), wherein the tension generated in the steel sheet due to the film is 1 MPa or more. Electrical steel sheet.

( 8 ) On the surface of the mother steel plate, SiO ₂ is contained in an amount of 30% by mass or more, an oxide is contained in an amount of 70% by mass or more, and, as a specific element, by mass%, Ni: 0.05% or more, Co: 0.05% Or more, Cr: 0.05% or more, Cu: 0.05% or more, Mo: 0.05% or more, Nb: 0.05% or more, Mn: 0.05% or more A substance or a mixture is applied, and the applied substance is applied with a tension of 1 MPa or more as a stress acting on the mother steel plate in an atmosphere of dew point ≦ 0 ° C. at a temperature of 400 to 1200 ° C. for 0.1 to 3600 seconds. (1) to ( 7 ), wherein the coating has good adhesion and magnetic properties, wherein at least a part or all of the coating is melted and solidified by heat treatment performed in step (1). An excellent method for producing electrical steel sheets.

( 9 ) One or more elements of Ni, Co, Cr, Cu, Mo, Nb, Mn are (average concentration of each element in the substance or mixture applied to the steel sheet surface) / (each element in the mother steel sheet) (Average concentration)> 1.00 The method for producing an electrical steel sheet having good film adhesion and excellent magnetic properties as described in ( 8 ).

( 10 ) Production of electrical steel sheet with good film adhesion and excellent magnetic properties according to ( 8) or (9) , wherein a substance or mixture for forming a surface film is applied by a dry process Method.

( 11 ) An electromagnetic wave having good film adhesion and excellent magnetic properties achieved in the step in which the steel sheet or the method for producing a steel sheet according to any one of (1) to ( 10 ) is processed as a steel sheet member. How to use steel plates.

( 12 ) A method for using a steel sheet according to ( 11 ), wherein the film-forming substance is applied in a process that is processed as a steel sheet-using member. how to use.

( 13 ) In the method for using a steel sheet according to ( 11 ) or ( 12 ), a heat treatment for melting one or more oxides contained in the film is processed as a steel sheet member. A method of using an electrical steel sheet with good film adhesion and excellent magnetic properties.

  The electrical steel sheet of the present invention has good film adhesion, and it is possible not only to improve the function related to the film, but also to improve the magnetic properties by stably generating high tension on the steel sheet. Is also achieved.

This will be described in detail below. The content of each component element is mass%.
First, the composition of the mother steel plate will be described.

  If C exceeds 0.07%, it is difficult to reduce it to 50 ppm or less at which magnetic aging does not occur even if decarburization is performed. Therefore, C is limited to 0.07% or less. Moreover, since it may degrade a magnetic characteristic, it is preferable to set it as 0.0400% or less. Further, it effectively works for texture improvement, suppresses the development of {111} orientation which is undesirable for magnetism, and has the effect of promoting the development of preferred {110}, {100}, {114} and other orientations. From this viewpoint, preferably 0.0031 to 0.0301%, more preferably 0.0051 to 0.0221%, more preferably 0.0071 to 0.0181%, and still more preferably 0.0081 to 0.0151%. It is. Generally, C is reduced to 0.0050% or less by decarburization annealing after cold rolling. From the viewpoint of production cost, it is possible to reduce the amount of C by degassing equipment at the molten steel stage, and if it is 0.0040% or less, the effect of suppressing magnetic aging is remarkable. Furthermore, coarse carbides are present in the steel plate, which is present on the surface of the base steel plate, and reacts with oxides in the coating during the heat treatment after coating, so that C is gasified and voids (bubbles, bubbles) are formed in the coating. It may form and significantly degrade the function of the coating. For this reason, it is more preferable to set it as 0.0030% or less, and 0.0015% or less is still more preferable. It may be 0%.

  Si increases the specific resistance of steel to reduce eddy currents and lower iron loss, but the effect is small when the addition amount is less than 0.2%. With low Si steel, there is almost no embrittlement of the steel and the magnetic flux density can be increased. However, considering the effect of reducing eddy current loss due to solid solution elements such as Si particularly in high frequency applications, preferably steel containing Si is preferably 1.0% or more, more preferably 2.0% or more. To do. However, if it exceeds 7.00%, the steel is embrittled and further the magnetic flux density of the product is lowered, so the content is made 7.00% or less. Preferably it is 5.5% or less, More preferably, it is 4.5% or less.

  Mn is an important element when using MnS or MnSe as an inhibitor and utilizing secondary recrystallization to improve magnetic properties. Like M, it increases the specific resistance of steel and reduces eddy currents, resulting in iron loss. It also has the effect of lowering. However, excessive addition reduces the magnetic flux density, so the upper limit is made 6.50%. Preferably it is 0.05 to 3.5%.

  If P exceeds 0.30%, embrittlement is severe, and it becomes difficult to perform hot rolling and cold rolling on an industrial scale, so the upper limit is made 0.30%. Preferably it is 0.10% or less.

  S is an element to be contained in the steel that uses sulfide as an inhibitor during secondary recrystallization. On the other hand, when secondary recrystallization is not used, magnetic characteristics, particularly iron loss, may be deteriorated. Further, as in C, coarse sulfide exists in the steel plate, and this exists on the surface of the base steel plate. When it reacts with the oxide in the coating during the heat treatment after coating, S is gasified and voids ( In some cases, the function of the film is significantly deteriorated. The S content is preferably as low as possible and may be 0%. In the present invention, the upper limit is 0.080%. Preferably it is 0.030% or less, More preferably, it is 0.010% or less, More preferably, it is 0.0030% or less, More preferably, it is 0.0010% or less.

  Al is usually added as a deoxidizing agent, but it is also possible to suppress the addition of Al and deoxidize with Si. Moreover, it has the effect which raises the electrical resistance of a steel plate as solute Al, and reduces an iron loss. In electrical steel sheets utilizing secondary recrystallization, AlN as an inhibitor plays a very important role. If it exceeds 8.0%, embrittlement becomes a problem, so the upper limit is made 8.0%. The upper limit is preferably 6.0%, more preferably 5.0%, still more preferably 4.0%, and even more preferably 3.0%. The lower limit may be 0, but unavoidably 0.0001% or more is often contained. In consideration of castability improvement by deoxidation and magnetic characteristics, it is preferably 0.01% or more, more preferably 0.08%, further preferably 0.5%, and further preferably 1.0%.

  N, as well as Al, AlN as an inhibitor has a very important role in conventional magnetic steel sheets utilizing secondary recrystallization. N, like C, degrades the magnetic properties, so it is set to 0.070% or less. Preferably it is 0.0301% or less, More preferably, it is 0.0221% or less, More preferably, it is 0.0181% or less, More preferably, it is 0.0151% or less. However, when Al is contained in an amount of about 0.010% or more, if a large amount of N is contained, it is preferable to avoid it because a large amount of fine nitride is formed and the magnetic properties are remarkably deteriorated. On the other hand, when coarse nitrides are present in the steel plate and this is present on the surface of the base steel plate, as with C, when it reacts with oxides in the coating during the heat treatment after coating, N is gasified into the coating. In some cases, voids (bubbles) are formed, and the function of the film is significantly deteriorated. Considering the cost of denitrification of the steel sheet in the manufacturing process in order to avoid the harm of nitride, it is preferable to reduce the N content in the molten steel stage in the Al deoxidized steel, 0.0040% or less The lower the steel of the present invention, the better. The content of 0.0027% or less has a remarkable effect of suppressing the deterioration of characteristics due to magnetic aging and nitride formation, more preferably 0.0022%, and still more preferably 0.00. It may be less than 0015% and 0%.

  O forms inclusions in the steel and degrades the magnetic properties, and depending on the application, it may be a starting point for destruction during use. Moreover, in order to deteriorate the castability at the time of casting at the time of steel plate manufacture, it is preferable that it is low. The upper limit is 0.070%, preferably 0.030%, more preferably 0.010%, more preferably 0.005%, more preferably 0.003%, and may be 0%.

  In addition, even if elements such as Bi, Sn, Sb, REM, Ca, Mg, B, Cu, Ni, Nb, and Ti, which are added to control various characteristics in the conventional electromagnetic steel sheet, are added. The effect of the invention is not impaired. The feature of the present invention is not in the base steel sheet itself but in the interface between the coating and the base steel sheet and the coating.

  Next, the state of the interface between the film and the base steel sheet, which is the greatest feature of the steel of the present invention, will be described. An element present at the interface and exhibiting the characteristics of the present invention is referred to as a “specific element”. Hereinafter, the “specific element” in this specification represents “one or more elements of Ni, Co, Cr, Cu, Mo, Nb, and Mn”.

  In the steel of the present invention, the characteristics are improved by concentrating a specific element at the interface between the base steel plate and the coating. Although this mechanism is not clear, such concentration enhances the adhesion of the film, as described above, prevents defects in the film, and provides necessary characteristics such as magnetic properties, insulating properties, and slip properties. It is thought to increase. Such an improvement in adhesion is due to the fact that the reactivity of the base steel plate and the oxide in the film differs between the concentrated and non-concentrated sites of the specific element, and this causes the interface to have a fine uneven shape. One is considered. Alternatively, it is considered that these concentrated elements have an effect of strengthening the chemical bond between the substance in the film and Fe in the mother steel plate. In particular, since this chemical bond becomes prominent when a large amount of oxide is contained in the film, the oxide in the film and the Fe oxide formed by combining Fe in the steel sheet with oxygen in the film It is thought to change the chemical bonding state.

  Phenomenonally, this effect becomes remarkable when the specific element has a site that is concentrated beyond the respective average concentrations of the base steel plate and the coating at the interface between the base steel plate and the coating. For a specific element, (concentration of each element at the concentration site at the interface between the base steel plate and the film) / (average concentration of each element in the base steel plate) ≧ 2.0 and (base steel plate) It is preferable that the concentration of each element in the concentrated portion at the interface between the film and the film) / (average concentration of each element in the film) ≧ 2.0, more preferably 3.0 or more, more preferably 5. If there is a portion concentrated to 0 or more, more preferably 10.0 or more, and 50.0 or more, the characteristics are remarkably improved, and the concentrated portion may be a pure element.

  The above-mentioned concentration can be sufficiently observed with the latest analysis equipment such as an electron microscope, X-ray analysis, electron beam analysis, ion analysis and the like. Of course, identification is possible by other methods such as chemical analysis. Needless to say, when examining the measurement data, it is necessary to determine the concentration of the specific element in consideration of not only the area of the measurement region but also the depth of the measurement region when analyzing from a specific surface. For example, if a region of 100% of a specific element is formed on a specific surface even if it is very thin, if the component analysis is performed from the surface with an analytical instrument using an electron beam or X-ray, it will pass through the film. This is a case where a low quantitative value is obtained as the content of the specific element because the components in the region including the base material portion are detected. In the present invention, analysis limited to a spatially sufficiently small region is necessary. Of course, even in a quantitative value obtained by averaging a wide region including a region where the specific element is not concentrated as in the above example, the quantitative value defined in the present invention, for example, the concentration of the specific element is 2 of the average content in steel. If it satisfies .0 times or more, it is not a problem to adopt the data.

  The effect of the invention becomes significant when the concentration of the specific element at the concentrated portion of the specific element formed at the interface between the mother steel plate and the coating is 0.10% or more. Preferably it is 0.5% or more, more preferably 1.0% or more, more preferably 3.0% or more, more preferably 10.0% or more, more preferably 30.0% or more, more preferably 50.0. % Or more, more preferably 0.0% or more, and even if a region having a concentration of 100% is formed, the effect of the invention is not impaired. It should be noted that the density of the micro area is sensitively influenced by the size of the measurement area. In other words, if one atom is measured as a sufficiently small region and limit, a space with a concentration of 100% will exist in any case. Of course, such a thing is excluded from the thickening part prescribed | regulated by this invention. In other words, if a too wide area is measured, the presence of a minute thickened portion may be overlooked. As a measure of the measurement region, although it is related to the size of the interface unevenness described later, it is preferable to use a region having a spread of about 0.1 μm. Of course, as long as it is recognized that the values obtained in the region below this are representative of the overall characteristics, it may be used depending on the measuring instrument and method.

  As mentioned above, the adhesion of the coating out of the target properties is defined by regulating the concentration of specific elements at the interface between the mother steel plate and the coating, by defining the components of the base steel plate and the components of the coating and the substances forming the coating. The sex can be greatly improved. As mentioned above, the adhesion improvement mechanism of the steel of the present invention is not necessarily elucidated, but can be characterized by changes in fine irregularities at the interface. This unevenness is characterized by a very fine and dense state as compared with the form of the interface between the base steel plate and the coating of a normal electromagnetic steel plate.

  As one of the characteristics, the depth of the unevenness at the interface is defined. In the steel of the present invention, the average depth is 5.0 μm or less. The depth of the unevenness can be observed with fine observations by fine observation, but in the present invention, the cross section of the steel sheet can be observed with an SEM (scanning electron microscope), and can be observed with a 2000-fold image. The degree of unevenness shall be measured. Small unevenness of 0.5 mm or less in a 2000 times photograph is excluded because it causes a problem in measurement accuracy. That is, unevenness of 0.25 μm or less is ignored. This does not mean that the unevenness below this does not affect the adhesion, and is merely a rule on the measurement method. It is preferable for the present invention that the adhesion is improved by fine irregularities below this, and it is rather preferable that such a state is achieved. The unevenness depth thus measured is preferably 3.0 μm or less, more preferably 2.0 μm or less, further preferably 1.0 μm or less, and further preferably 0.5 μm or less. The lower limit is not particularly required and may be 0 μm.

  Adhesion is improved by forming a large number of such irregularities, and the average period of irregularities is 15.0 μm or less, that is, 100 or more irregularities exist as a set in a length of 1 mm. The effect is remarkably good. More preferably, the average period is 10.0 μm or less, more preferably 5.0 μm or less, more preferably 3.0 μm or less, further preferably 1.0 μm or less, more preferably 0.5 μm or less, and further preferably 0.2 μm. It is as follows. Although there is no particular need to provide a lower limit, in terms of the measurement method, irregularities with a depth of 0.25 μm or less are ignored, so the period is at most 0.05 μm.

  As described above, in the steel of the present invention, the roughness of the interface between the film and the base steel sheet is specified, but this is also affected by the steel sheet roughness before the film is formed and before the film forming substance is applied. It is a thing. However, in the steel of the present invention, the roughness of the base steel plate is not particularly specified. This is because it is a decisive factor for the characteristics to control the roughness as in the present invention after the film is formed. The roughness of the interface controlled in the present invention shows a finer form that is finer than the surface roughness of the generally controlled steel sheet. From the final characteristics, it is preferable to keep the roughness of the base steel sheet as small as possible. If the roughness of the base steel sheet is too rough, there will be rough unevenness along with fine unevenness at the interface, which deteriorates the properties of the steel sheet and causes film defects. The surface roughness of the mother steel plate is generally sufficient, but as a guideline, Ra is 5 μm or less, preferably 3 μm or less, more preferably 1 μm or less, more preferably 0.5 μm or less, and further 0.2 μm. In the following, smoothing as a general steel sheet surface is rather preferable from the characteristics of the steel sheet.

Hereinafter, the film that is characteristic of the present invention will be described.
The film in the present invention is a generic term for films formed on the surface of a steel plate. However, a film similar to metal plating in which 50% or more of the film becomes a metal phase by volume ratio is excluded. As a substance constituting the film, any compound such as oxide, carbide, nitride, sulfide, fluoride, chloride, hydroxide, nitrate, sulfate and the like can be contained. Further, the inclusions in the film include not only substances intentionally added, but also those produced by a reaction during the treatment for forming the film.

  The method for forming the film is not particularly limited, and can be formed by generally known surface treatments such as vapor deposition, plasma spraying, coating, oxidation, and nitriding. However, according to the present invention, it is necessary to form a segregation part of a specific element at the interface, and in that sense, it has a multilayer structure, so that it is generally difficult to achieve the object with a simple uniform surface treatment. As one method for achieving the present invention, as described later, an appropriate amount of a substance or mixture containing a specific element is applied to the surface of the base steel plate, or the base plate itself contains the specific element, and then treated at a high temperature. By doing so, it is possible to form a film and segregate a specific element at the interface between the base steel plate and the film. Alternatively, it is possible to form a film having a structure in which a specific element is concentrated at the interface portion through a plurality of surface treatment steps or surface modification. For example, a method of forming a film after plating a substance having a specific element is conceivable. A preferred film forming method will be described later.

  From the viewpoint of the effect of the invention, it is preferable that the film is mainly composed of an oxide. The effect of the invention becomes remarkable when 70% or more of the composition of the substance constituting the film is an oxide. Preferably it is 80% or more, more preferably 90% or more, more preferably 95% or more. By making 99% or more oxide, the effect of the invention becomes more remarkable, and it may be 100%. In general, what can be contained in substances mainly composed of oxides such as various glasses is assumed.

  Considering the cost, productivity and ease of processing of the raw material, the oxide in the film is mainly composed of SiO2. It is preferable to set it as 30% or more by the mass% in a film. It is more preferable to set it to 45%, and it may be 60% or more, further 75% or more, and further 90% or more. However, increasing SiO2 also means that the content of the specific element is reduced, so that it is appropriate. Need to stay within range. In addition, when other oxides are used, it is possible to limit the main oxides to several oxides, including workability and cost, and also the case where the above specific elements are added. That is, it is preferable that the composition of the film includes one or more of NiO, CoO, Cr2O3, NbO2, Nb2O5, and MnO. Examples of auxiliary oxides include Na2O, K2O, MgO, ZnO, Al2O3, Sb2O5, P2O5, SnO2, ZrO2TiO2, and B2O3. Of course, the inclusion of oxides not shown here does not impair the effects of the present invention.

  Note that, in a conventional electromagnetic steel sheet, as a known technique, a film mainly composed of oxides such as oxides of Si, Mg, Al, Ti, Cr, or composite oxides thereof is formed. A preferred embodiment of the present invention is a film mainly composed of oxides, but is completely different from the prior art in terms of the film structure including the interface, manufacturing method, characteristic improvement effect, characteristic improvement mechanism (technical idea), and the like. Is.

Next, a method for containing a specific element will be described.
The specific element can be concentrated at the interface by adding it to the film side or the base steel plate side, and the method itself is not particularly limited. However, when added to the base steel plate side, it may have an undesirable effect on the magnetic properties of the base steel plate, which can be said to be an important final object of the present invention. In addition, it is not a good idea to simply disperse elements that should be unevenly distributed in a very narrow area called an interface in a steel plate that is much thicker than the coating. Furthermore, considering the movement for segregation of the specific element at the interface, it is advantageous to include the specific element on the film side where a part of the film is melted by heat treatment or the like and can be expected to have higher fluidity than the steel sheet. It becomes. For these reasons, in the steel of the present invention, it is preferable that the specific element (average element concentration in the film) / (average element concentration in the base steel plate)> 1.00. It is a very preferable method that the specific element is contained in the film rather than contained in the steel sheet in order to form the interface structure characteristic in the present invention and to obtain the effect sufficiently. Preferably it is 10.00 or more, More preferably, it is 100.00 or more.

  In the present invention, not a few specific elements are added to the film, but various addition methods and forms of substances to be added are considered. Although adding as a pure metal or as an intermetallic compound or a nonmetallic compound is considered, it is not specifically limited. The change in the interface as described above occurs mainly due to the reaction during the heat treatment applied after coating.

Next, the content of the specific element in the film will be described.
Among the specific elements, Ni, Co, and Cr are particularly important elements with extremely remarkable effects. First, these will be described.

  When the Ni content is less than 0.05%, almost no beneficial effect is detected. In order to obtain a beneficial effect, addition of 0.10% or more is preferable, more preferably 0.50% or more, still more preferably 1.0% or more, and 2.0% or more. When 5.0% or more is added, the effect tends to be saturated. Excessive addition is not preferable from the viewpoint of cost, but at the same time, the non-uniformity of the reaction between the film and the steel becomes large, and it becomes easy to cause film defects and it is difficult to apply tension. It is preferable. More preferably, it is 10.0% or less, and even if it is 8.0% or less, a sufficient effect can be obtained.

  Since Co has a remarkable effect like Ni, it can be added in the present invention. Below 0.05%, little beneficial effect is detected. In order to obtain a beneficial effect, addition of 0.10% or more is preferable, more preferably 0.50% or more, still more preferably 1.0% or more, and 2.0% or more. When 5.0% or more is added, the effect tends to be saturated. Excessive addition is not preferable from the viewpoint of cost, but at the same time, the non-uniformity of the reaction between the film and the steel becomes large, and it becomes easy to cause film defects and it is difficult to apply tension. It is preferable. More preferably, it is 10.0% or less, and even if it is 8.0% or less, a sufficient effect can be obtained.

  Since Cr has the same effect as Ni and Co, it can be added in the present invention. Below 0.05%, little beneficial effect is detected. In order to obtain a beneficial effect, addition of 0.10% or more is preferable, more preferably 0.50% or more, still more preferably 1.0% or more, and 2.0% or more. When 5.0% or more is added, the effect tends to be saturated. Excessive addition is not preferable from the viewpoint of cost, but at the same time, the non-uniformity of the reaction between the film and the steel becomes large, and it becomes easy to cause film defects and it is difficult to apply tension. It is preferable. More preferably, it is 10.0% or less, and even if it is 8.0% or less, a sufficient effect can be obtained.

Next, Cu and Mo, which are elements having a specific action among the specific elements and exhibiting remarkable effects on the effects of the invention, will be described.
Cu exhibits the same effect as Ni and Co, but Cu alone has a relatively small effect, and the effect becomes remarkable when added simultaneously with other elements, particularly Ni and Co. When the content is less than 0.05%, the effect of the present invention is hardly detected. In order to sufficiently obtain the effects of the invention, 0.08% or more of addition is necessary, preferably 0.10% or more, more preferably 0.50% or more, and 1.0% or more of the effect. If the addition is 2.0% or more, the effect tends to be saturated. Excessive addition is not preferable from the viewpoint of alloy cost, but at the same time, the non-uniform reaction between the film and steel becomes large, and defects tend to occur in the film. More preferably, it is 5.0% or less, and even if it is 3.0% or less, sufficient effects can be obtained. The mechanism by which Cu becomes effective when combined with Ni or Co is not clear, but Cu does not induce changes in the interface shape directly like Ni and Co, but increases the effect of Ni and Co. It is thought that For example, it is considered that when Ni or Co segregates at the interface between the coating and the base steel plate, the segregation behavior, particularly the amount of segregation and the distribution of uneven distribution on the interface is affected. Cu is unlikely to form an oxide, and Cu in the film is considered to be relatively easily segregated at the interface, and it is also considered that the segregation of Cu affects the segregation of Ni and Co. Although it is not clear whether Ni or Co preferentially segregates in the Cu segregation part, or avoiding the Cu segregation part, the segregation of Ni or Co becomes a preferable form, but some interaction is exerted at the interface part. It is thought that there is.

  Mo has an intermediate effect between Ni and Co and Cu. That is, it has an effect of making the effects of Ni and Co not only remarkable, but also has a large effect alone. Below 0.05%, little beneficial effect is detected. In order to obtain a beneficial effect, addition of 0.10% or more is preferable, more preferably 0.50% or more, still more preferably 1.0% or more, and 2.0% or more. When 5.0% or more is added, the effect tends to be saturated. Excessive addition is not preferable from the viewpoint of cost, but at the same time, the non-uniformity of the reaction between the film and the steel becomes large, and it becomes easy to cause film defects and it is difficult to apply tension. It is preferable. More preferably, it is 10.0% or less, and even if it is 8.0% or less, a sufficient effect can be obtained. The effect of Mo is not clear, but in addition to the effect of Cu, it may form a complex oxide with oxygen in the film together with Ni and Co, which may affect the behavior of Ni and Co. This is probably because the interaction with Ni and Co attracts strongly and exists in such a form that these segregated portions are also dissolved.

  Other specific elements include Nb and Mn. These elements are not effective by themselves, but rather have the effect of increasing the effects of the above-described Ni, Co, Cr, Cu, and Mo. Although this mechanism is not clear, these form oxides in the film, and the above elements are rejected and segregated on the steel sheet side, or combined with C, N, S, etc. contained in the steel sheet in a small amount. Then, it is considered that a compound is formed on the surface of the steel plate and becomes a segregation starting point of Ni or the like. In order to obtain this effect, Nb is contained in an amount of 0.05% or more, preferably 0.1% or more, more preferably 1.0% or more. In the case of Mn, 0.05% or more, preferably 1.0% or more, more preferably 3.0% or more. However, if these elements are contained excessively, defects are likely to occur in the film, and the insulating properties, slip properties, corrosion resistance, adhesion, etc. that the film should have are deteriorated. For this reason, Nb is preferably 20.0% or less, more preferably 10.0% or less, and still more preferably 5.0% or less. Mn is preferably 20.0% or less, more preferably 10.0% or less, and still more preferably 7.0% or less.

  The contents of the seven elements described above relate to the contents of the elements in the film formed on the mother steel plate in the final use situation, but the same range can be used for forming the film. The substance or mixture to be applied to the steel sheet surface is also specified.

  The element content in the film and the element content in the applied substance or mixture are externally determined in the treatment process associated with the film formation, typically a heat treatment in which part or all of the applied substance or mixture is melted and solidified. It will be the same if there is no movement of material. However, depending on the type of coating substance or mixture and the film forming treatment conditions, the balance of the substance with the outside of the substance occurs. For example, when the nitride in the coating material reacts with the oxide in the coating material or oxygen in the atmosphere to generate oxide, nitrogen is gasified and diffused into the atmosphere, or Fe from the mother steel plate For example, when it spreads and enters. At this time, the content of the element in the film is different from that of the substance or mixture applied to the surface of the mother steel plate to form the film. And since the change is influenced also by heat processing conditions, it cannot be determined uniquely. From the viewpoint of control, it is easier from the viewpoint of industrial production to control with a material to be applied in advance than a material in the final film. For this reason, in this invention, content about seven elements essential for the effect of this invention prescribes | regulates not only in a film | membrane but the substance or mixture apply | coated to the mother steel plate surface in order to form a film | membrane. is there. The range is the same as that in the film, but as described above, it is difficult to determine uniquely because the change in content is affected by the heat treatment conditions, etc. It is what. Whether it is the content in the film or the content in the substance or mixture applied to the mother steel plate surface to form the film, the segregation of the specific element at the interface is within the scope of the present invention. It stipulates the range where the effects of waking up and aiming are sufficiently obtained.

Next, the form of the film will be described.
If the thickness of the film is too thick, when it is laminated as an electrical component, the presence rate of the steel sheet that bears the magnetic properties, the so-called space factor, decreases, and the magnetic properties as a member are impaired. Therefore, the upper limit is preferably 20.0 μm. More preferably, it is 10.0 micrometers or less, More preferably, it is 6.0 micrometers or less, More preferably, it is 3.0 micrometers or less. When the film is not present, it is not included in the steel of the present invention, but the effect of the present invention can be detected even if the thickness is 1.0 μm or less, further 0.5 μm or less, and further 0.1 μm or less. is there.

  This space factor is related to the thickness of the mother steel plate. In the present invention, it is preferable that (average thickness of the coating) / (steel plate thickness) ≦ 1/10. Further, it is 1/20 or less, further 1/40 or less, and may be 1/100 or less.

  However, since the effect of the tension is also influenced by the amount of the film, that is, the thickness, the film may be thickened to such an extent that the space factor is not a problem under the use conditions. Such a film generates tension in the steel sheet. If the tension described here does not occur, not only the magnetic properties of the steel sheet will deteriorate, but the film will be easily broken, and the film characteristic of the present invention will have defects due to slight impact and deformation during steel sheet handling and use. As a result, the adhesiveness is lowered and the insulating property and the slip property are also adversely affected. One feature of the steel according to the present invention is that the tension generated in the steel sheet is 1 Mpa or more. Preferably it is 3 MPa or more, more preferably 5 MPa or more, more preferably 10 MPa or more, more preferably 15 MPa or more, more preferably 20 MPa or more, more preferably 30 MPa or more, and even if a larger tension is applied, there is no problem. .

  As is generally well known, such steel plate tension is caused by the difference between (linear expansion coefficient of the coating) and (linear expansion coefficient of the base steel plate), and the linear expansion coefficient of the coating is less than that of the base steel plate. By making it small, tension is generated in the steel sheet during the cooling process after the heat treatment. Basically, the tension that contributes to the magnetic properties is controlled by the difference in expansion coefficient, the film thickness, and the heat treatment conditions such as the heat treatment temperature and the cooling rate. The larger the difference in the expansion coefficient, the greater the tension that can be applied to the steel sheet. However, the compressive force acts on the film in the in-plane direction of the steel sheet. Care must be taken because the coating will be destroyed and defects will be generated. Since the steel of the present invention has a very high adhesion between the oxide film and the mother steel plate, it has a feature that it is very strong against breakage due to such compressive force.

  Next, a characteristic manufacturing method of the steel sheet of the present invention, that is, a film forming method will be described. It goes without saying that the film forming method is not limited to the method shown here, but according to this method, the effects of the invention can be obtained efficiently and at low cost.

  The surface coating in the steel of the present invention is heat-treated at a temperature at which one or more oxides contained in the applied coating are melted after applying an oxide or a substance containing oxide to the steel sheet. And it is preferable to form by solidifying after that. During this heat treatment, segregation at the interface of specific elements, accompanying change in interface morphology, densification of the film, generation of thermal strain, change in film surface properties, etc., insulation, adhesion, slipperiness, corrosion resistance, Tension and the like are in a preferable state.

  Moreover, it is preferable that the steel plate surface which apply | coats a film forming substance does not have an oxide film substantially. This is because, in the state where the initial oxide film is formed, even if a substance having a controlled composition or the like is applied, there is a risk that the interface state where the initial oxide film was present becomes unfavorable. The term “substantially” mentioned here is because it is difficult to completely remove the oxide film from the surface of the steel sheet because the manufacturing process of the steel sheet is carried out in an atmosphere containing oxygen. If it is a manufacturing process of a normal steel sheet without special atmosphere control, the thickness of the initial oxide layer does not exceed 0.5 μm even in a normal cold-rolled sheet. Of course, in this production method, since at least a part of the oxide is melted during the heat treatment, the effect of removing and modifying the initial oxide film can also be expected. It is also conceivable to exert a favorable effect. However, in order to achieve such a state, it is necessary to pay attention so that the formation of the initial oxide film is preferable. Therefore, in the present invention, it is recommended that the initial oxide film be applied substantially without the initial oxide film. .

  In addition, the application of the substance containing an oxide is preferably performed by a dry process from the viewpoints of manufacturing cost, disposal of waste accompanying the application, and the like. Furthermore, by using a dry process, it is possible to suppress the occurrence of film defects due to gas atoms from the atmosphere as described later, the film uniformity is improved, and the effect of improving the steel sheet characteristics is also favorable. For the application by the dry process, it is usually possible to use electrostatic powder coating or the like that has a proven record in various coatings.

  Next, heat treatment conditions for melting one or more oxides contained in the applied film will be described. If this temperature is too low, the oxide will not be sufficiently melted and the film will not be sufficiently densified or flattened, resulting in film defects, and the segregation of specific elements will be insufficient, resulting in poor adhesion. . In addition, when the temperature is too high, not only energy cost problems will occur, but the viscosity of the molten film material will decrease too much, making it difficult to ensure the thickness of the film, and the reaction between the oxide in the film and the base steel plate It is too intense to make it difficult to form a good film including the interface structure and to inhibit the desired function. A suitable temperature range is 400 to 1200 ° C, preferably 500 to 1000 ° C, more preferably 600 to 900 ° C, and still more preferably 700 to 850 ° C. Similarly, the heat treatment time is also an important factor, preferably 0.1 to 3600 seconds, more preferably 0.2 to 1200 seconds, further preferably 0.5 to 300 seconds, and more preferably 1.0 to 60 seconds. is there. Needless to say, the higher the heat treatment temperature, the shorter the time. If the time is too short, the time required for the concentration of specific elements at the interface and the formation of irregularities at the interface will be insufficient, and if it is too long, the diffusion of Fe from the mother steel sheet into the coating will be insufficient. The amount increases, and the properties of the film change to undesirable ones.

  Another feature of this process is the control of the dew point during the film-forming heat treatment. In this process, if heat treatment is performed in an atmosphere with a too high dew point, defects may occur in the film after the heat treatment. The cause of this is not clear, but gas atoms that have penetrated into the base steel plate during heat treatment are discharged from the base steel plate as the steel plate after heat treatment cools, causing bubbles to form in the film or at the interface, resulting in film defects. it is conceivable that. This gas atom may be generated not only from the atmosphere but also from the applied film-forming substance. For this reason, it is preferable that the substance containing an oxide to be applied to form a film does not contain organic substances that easily decompose or moisture. Control of the atmosphere makes the dew point 0 ° C. or less, and the effect of suppressing this damage becomes remarkable. It is preferably −10 ° C. or lower, more preferably −20 ° C. or lower, further preferably −40 ° C. or lower, and further preferably −60 ° C. or lower.

  As described above, the steel of the present invention is in a state where tension is generated in the mother steel plate. This tension can be generated during the film formation heat treatment and cooling due to the difference in thermal expansion between the film material and the base steel plate, but in the steel according to the present invention, a tension is applied to the steel plate during the film formation heat treatment. In addition, it is possible to leave the tension in the mother steel sheet by removing the tension after the film formation. However, in this method, anisotropy in the plate surface is generated in the remaining tension depending on how the tension is applied. This anisotropy does not cause any harm, and may be preferable depending on the application. The direction of tension can be controlled by the required characteristics and usage method. For example, in the case of manufacturing a steel sheet with a coil, by applying tension in the longitudinal direction of the coil, the tension in this direction increases and iron loss decreases, and a large compressive force acts on the film. Therefore, the fracture resistance of the film against the deformation in this direction is improved. In order to obtain this effect remarkably, it is preferable to apply a tension of 1 MPa or more. It goes without saying that the greater the tension, the greater the effect, but it is necessary to pay attention to the above-mentioned anisotropy, and when the tension is too high, the steel sheet deforms or the film itself breaks due to the compressive force generated in the film. Care must be taken because it is possible that this will happen.

  The process for producing the characteristics of the steel sheet as described above is not limited to the manufacturing process of the steel sheet. That is, it is also possible to use the steel sheet not having the above-described features and impart the above-described features in the steel sheet processing process, that is, the electrical component manufacturing process. In other words, the application of the film-forming substance as described above can be performed during the processing step, before the lamination of the steel sheets, or after the film formation heat treatment is laminated on the steel sheets. For example, after punching a steel plate, coating a film-forming substance on only one side of the steel plate, laminating so that the coated surface is in the same direction, and then performing a heat treatment to fix the formation of the coating and the laminated steel plate It is also possible to do it simultaneously. By doing in this way, the film formation process conventionally performed on the steel sheet manufacturing side can be omitted, and the fixing process of the laminated steel sheets such as caulking and welding, which has been performed at the time of processing, can be omitted. Furthermore, energy costs can be reduced by utilizing strain relief annealing, which is generally performed by users of magnetic steel sheets, as a film-forming heat treatment. When the laminated steel sheet is fixed in this way, according to the present invention, the adhesion between the film and the base steel sheet is strong, and it is possible to completely eliminate the trouble of peeling at the interface between the film and the base steel sheet as in the conventional method. Become. Of course, it is also possible to use a method in which a film is formed with a steel plate, only heat treatment is performed in a state of being laminated as a member, and the film is re-melted and solidified so as to fix the layer.

  With respect to the base steel plate containing the above components, it is melted in a converter in the same manner as a normal electromagnetic steel plate, is made into a slab by continuous casting, and is then manufactured in processes such as hot rolling, pickling, cold rolling, annealing. . Performing cold rolling and annealing a plurality of times in these steps, or passing through a decarburization step, does not impair the effects of the present invention. Moreover, there is no problem even if it is manufactured by a process such as a thin slab CC which omits the hot rolling process instead of the normal process. In general, the present invention is not limited to transformer parts using directional electromagnetic steel sheets and motor parts using non-oriented electromagnetic steel sheets, and electrical and magnetic properties are required regardless of the type and application of the electromagnetic steel sheets. Applicable to all electromagnetic steel sheet applications. The coating basically forms the same material with the same thickness on both the front and back surfaces of the steel sheet, but is not limited to this. Depending on the method of use and application, a film within the scope of the present invention may be formed with different materials or different thicknesses on the front and back sides. Moreover, it is also possible to impart various surface characteristics by forming organic substances such as epoxy resin, phenol resin, and acrylic resin on a film mainly composed of oxide as in the case of conventional electromagnetic steel sheets. There is no loss.

  Various substances were applied to the various electrical steel sheets shown in Table 1, heat-treated to form a film, and the characteristics were evaluated. At this time, a specific substance is contained in the substance applied to the steel sheet surface, and segregation on the steel sheet surface is induced in the heat treatment to obtain the effect of the invention. As a material applied to the steel plate surface, a mixture mainly composed of oxides shown in Table 2 was used. The ratio of oxides and the like contained in the mixture is as shown in Table 2. In actual coating, oxides and the like containing specific elements were further added thereto. As shown in Table 3, the specific element is added in the form of pure metal powder, carbide, nitride, sulfide, etc. in addition to the oxide, and the final specific element concentration is added as shown in Table 3. It was adjusted. For this reason, the ratio of oxides and the like in the final coating material deviates from the numbers in Table 2, assuming that the total is 100%. The film finally formed has the same quality and thickness on the front and back of the steel sheet. Two coating methods were used. One is a method in which the coating substance is made into powder and is made to adhere to the surface of the steel sheet by being charged, which is generally known as electrostatic powder coating.

  Since this method does not use a liquid solvent or the like in the coating step, it is generally called a dry process. In Table 3, “Dry” is described. The other method is to mix the powdered coating material with the liquid and spray it onto the steel plate. As the liquid, water, an organic solvent, or the like can be used, which is generally known as a wet process. In Table 3, “Wet” is described. In this example, water is used as the liquid, and so-called “clay” such as silica, silica sand, borax, etc. is used as the base material in Table 2 in order to control the mixing of the coating substance in water and the adhesion to the steel plate. Minutes were added as some additive.

The adhesion of the film was evaluated by visually observing the film peeling state of the deformed part when a 2 kg ball head weight was dropped from a height of 2 m and deformed. The film properties were evaluated by visually observing the film after film formation by heat treatment, and evaluating the occurrence of film abnormalities such as film peeling, black spots, and cloudiness.
Regarding the adhesion and properties of the film, evaluation was indicated as x: problematic, △: usable (conventional film level), ◯: good, ◎: very good.

Regarding the magnetic characteristics, since the change in magnetic flux density due to the application of the present invention is small, the effect was evaluated by iron loss. As for the iron loss, the iron loss W _15/50 was measured by the SST test of 55 mm square, and the average value in the rolling direction of the coil and the direction perpendicular _thereto was obtained. Since the iron loss greatly varies depending on the components of the steel sheet and the heat history, the effect of the invention was evaluated by the difference in iron loss compared to a material that was not coated with a substance and was subjected to the same heat treatment as the film forming material.

Various characteristics are shown in Tables 3-1 and 3-2.
Steel numbers 1, 2, 18, 19, 29, 30, 33-36, 39, and 44 are examples in which the coating substance does not contain a specific element or even if it contains a specific element, the effect is not manifested because of a small amount. Other than this, the specific substance is concentrated at the interface between the film and the steel sheet, and the film adhesion strength is increased, so that the tension on the steel sheet by the film acts sufficiently and an effect of improving iron loss appears.

  Steel Nos. 52 to 59 were obtained by cutting out a 55 mm SST sample from a steel plate produced without forming a film, and stacking and heat-treating five sheets of a film-forming substance applied on both sides to form a film. The iron loss was measured and evaluated with a 55 mm square SST sample obtained by stacking five steel plates. In addition, the film thickness in a table | surface has described the film thickness at the time of performing the same application | coating and heat processing to one steel plate. It shows that the effect of the present invention can be obtained even when a steel sheet user performs film formation and lamination in the manufacturing process of a motor core or a transformer core.

Claims (13)

The mother steel plate is, in mass%, C: 0.070% or less (including 0), Si: 7.00% or less (including 0), Mn: 6.50% or less (including 0), P: 0 30% or less (including 0), S: 0.080% or less (including 0), Al: 8.0% or less (including 0), N: 0.070% or less (including 0), O A magnetic steel sheet containing 0.070% or less (including 0), the balance being Fe and inevitable impurities, and having a film containing an oxide on its surface, and the SiO ₂ in the film is 30 More than mass%, oxide is 70 mass% or more, and in the film, as a specific element, Ni, Co, Cr, Cu, Mo, Nb, Mn, or two or more kinds in mass%, Ni: 0.05% or more, Co: 0.05% or more, Cr: 0.05% or more, Cu: 0.05% or more, Mo: 0.05 Above, Nb: 0.05% or more, Mn: contains 0.05% or more ranges, for the concentration of the specific elements, (each element concentration of thickening site at the interface of the base steel and the film) / (Mother each element average density) ≧ 2.0 in the steel sheet, and (the element concentration of thickening site at the interface of the base steel and the film) / (the elements mean concentration ≧ 2.0 in the film, meets the and An electrical steel sheet having good film adhesion and excellent magnetic properties , wherein the concentration of the concentrated portion at the interface between the base steel sheet and the film of the specific element is 0.10% by mass or more . Electrical steel sheet film adhesion according to claim 1 Symbol placement is excellent excellent magnetic properties, wherein the average depth of the interface between the base steel and the film unevenness is not more than 5.0 .mu.m. 3. The electrical steel sheet having good film adhesion and excellent magnetic properties according to claim 1, wherein the average period of unevenness at the interface between the base steel sheet and the film is 15.0 μm or less. One or more elements of Ni, Co, Cr, Cu, Mo, Nb, and Mn are (average element concentration in the film) / (average element concentration in the base steel plate)> 1.00 The electrical steel sheet having good film adhesion and excellent magnetic properties according to any one of claims 1 to 3 . Electrical steel sheet coating adhesion according to any one of claims 1-4 is excellent excellent magnetic properties, wherein the average thickness of the film is less than 20.0 .mu.m. The average thickness of the coating film / (the thickness of the steel plate) ≦ 1/10, wherein the electrical steel sheet has good coating film adhesion and excellent magnetic properties according to any one of claims 1 to 5. . The electrical steel sheet having good film adhesion and excellent magnetic properties according to any one of claims 1 to 6 , wherein the tension generated in the steel sheet due to the film is 1 MPa or more. On the surface of the mother steel plate, SiO ₂ is contained in an amount of 30% by mass or more, an oxide is contained in an amount of 70% by mass or more, and as specific elements, by mass%, Ni: 0.05% or more, Co: 0.05% or more, Cr : Substance or mixture containing 0.05% or more, Cu: 0.05% or more, Mo: 0.05% or more, Nb: 0.05% or more, Mn: 0.05% or more The heat treatment is performed in a state in which a tension of 1 MPa or more is applied as a stress acting on the base steel plate in an atmosphere having a dew point of 0 ° C. for 0.1 to 3600 seconds at a temperature of 400 to 1200 ° C. The magnetic steel sheet having good film adhesion and excellent magnetic properties according to any one of claims 1 to 7 , wherein at least a part or all of the coating is melted and solidified to form a film. Production method. One or more elements of Ni, Co, Cr, Cu, Mo, Nb, and Mn are (average concentration of each element in the substance or mixture applied to the steel plate surface) / (average concentration of each element in the mother steel plate) The method for producing an electrical steel sheet having good film adhesion and excellent magnetic properties according to claim 8 , wherein> 1.00. 10. The method for producing an electrical steel sheet with good film adhesion and excellent magnetic properties according to claim 8, wherein a substance or a mixture for forming a surface film is applied by a dry process. A method for using a steel sheet according to any one of claims 1 to 10 , wherein the method for producing a steel sheet or steel sheet has good film adhesion and excellent magnetic properties achieved in a step of processing as a steel sheet using member. A method for using an electrical steel sheet having good film adhesion and excellent magnetic properties , wherein the method for using a steel sheet according to claim 11 is performed in a process in which coating of a film forming substance is processed as a steel sheet using member. The method for using a steel sheet according to claim 11 or 12 , wherein the heat treatment for melting one or more oxides contained in the film is performed in a step processed as a steel sheet member. To use electrical steel sheet with good film adhesion and excellent magnetic properties.