JPH11293422A - Silicon steel plate remarkably low in high frequency iron loss - Google Patents
Silicon steel plate remarkably low in high frequency iron lossInfo
- Publication number
- JPH11293422A JPH11293422A JP10110093A JP11009398A JPH11293422A JP H11293422 A JPH11293422 A JP H11293422A JP 10110093 A JP10110093 A JP 10110093A JP 11009398 A JP11009398 A JP 11009398A JP H11293422 A JPH11293422 A JP H11293422A
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- steel sheet
- iron loss
- silicon steel
- thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14775—Fe-Si based alloys in the form of sheets
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、トランス、リアク
トル、モータなどの鉄心用として好適である高周波鉄損
の低い珪素鋼板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silicon steel sheet having a low high-frequency iron loss suitable for use in iron cores of transformers, reactors, motors and the like.
【０００２】[0002]
【従来の技術】一般に珪素鋼板の鉄損は励磁周波数が高
くなると急激に上昇することが知られている。一方、近
年、珪素鋼板が広く用いられているトランス、リアクト
ル、モータなどの駆動周波数は、鉄心の小型化や高効率
化をはかるために、年々高周波化してきている。2. Description of the Related Art It is generally known that the iron loss of a silicon steel plate rapidly increases as the excitation frequency increases. On the other hand, in recent years, the driving frequency of transformers, reactors, motors, and the like, in which silicon steel sheets are widely used, has been increasing year by year in order to reduce the size and increase the efficiency of the iron core.
【０００３】この駆動周波数の高周波化に伴い、珪素鋼
板の鉄損によるこれら鉄心の温度上昇や効率の低下が間
題となるケースがとみに増加してきている。このような
理由から珪素鋼板の高周波鉄損を低減することが必要と
されるようになってきている。[0003] With the increase in the driving frequency, the number of cases in which a rise in the temperature of these iron cores and a decrease in efficiency due to iron loss of the silicon steel plate become a problem are increasing. For these reasons, it has become necessary to reduce high-frequency iron loss of silicon steel sheets.
【０００４】従来、珪素鋼板の高周波鉄損を低減する手
法としては、Ｓｉ含有量を高めて固有抵抗を高くするこ
とで高周波鉄損を低減する方法と、板厚を薄くして渦電
流損失を抑えることで高周波鉄損を低減する方法がとら
れている。Conventionally, there are two methods of reducing the high-frequency iron loss of silicon steel sheets: a method of reducing the high-frequency iron loss by increasing the Si content and increasing the specific resistance, and a method of reducing the eddy current loss by reducing the thickness of the sheet. A method of reducing high-frequency iron loss by suppressing it has been adopted.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来技術のうち、Ｓｉ含有量を高める方法は、珪素鋼板の
加工性を著しく低下させるため、珪素鋼板そのものの生
産性の低下を招くことに加え、鉄心の加工コストの上昇
も招くという問題点がある。However, among the above-mentioned prior arts, the method of increasing the Si content significantly lowers the workability of the silicon steel sheet, so that the productivity of the silicon steel sheet itself is lowered. There is a problem that the cost of processing the iron core also increases.
【０００６】また板厚を薄くする方法も、薄くするほど
鋼板そのものの製造コストが増加し、なおかつ鉄心の積
層枚数が増えることから鉄心の製作コストの上昇を招く
という間題点がある。The method of reducing the thickness of the sheet also has a problem that the thinner the sheet, the higher the manufacturing cost of the steel sheet itself, and the more the number of laminated iron cores, resulting in an increase in the manufacturing cost of the iron core.
【０００７】本発明はかかる事情に鑑みてなされたもの
であって、トランス、リアクトル、モータなどの鉄心用
として好適である高周波鉄損の極めて低い珪素鋼板を提
供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a silicon steel sheet having extremely low high-frequency iron loss, which is suitable for use in iron cores of transformers, reactors, motors, and the like.
【０００８】[0008]
【課題を解決するための手段】本発明者らは上述した課
題を解決すぺく鋭意研究を重ねた結果、珪素鋼板におい
て、鋼板の板厚方向に表層Ｓｉ濃度が高くなるようなＳ
ｉ濃度勾配を形成し、かつ鋼板中心のＳｉ濃度および表
層Ｓｉ濃度を特定の範囲に規定することにより、珪素鋼
板の鉄損、特に高周波鉄損を著しく低くすることができ
ることを見出した。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, it has been found that silicon steel sheets have such a surface steel concentration as to increase in the thickness direction of the steel sheet.
By forming an i-concentration gradient and defining the Si concentration and the surface Si concentration at the center of the steel sheet in specific ranges, it has been found that iron loss, particularly high-frequency iron loss, of a silicon steel sheet can be significantly reduced.
【０００９】本発明は、このような知見に基づいて完成
されたものであって、第１に、鋼板表層のＳｉ濃度が鋼
板中心部のＳｉ濃度よりも高く、かつ板厚中心のＳｉ濃
度が３．４ｗｔ．％以上、鋼板表層のＳｉ濃度が５ｗ
ｔ．％以上であることを特徴とする高周波鉄損の極めて
低い珪素鋼板を提供するものである。The present invention has been completed based on such findings. First, the Si concentration in the surface layer of the steel sheet is higher than the Si concentration in the center part of the steel sheet, and the Si concentration in the center of the sheet thickness is low. 3.4 wt. % Or more, the Si concentration of the steel sheet surface layer is 5w
t. % Or less, and a silicon steel sheet having extremely low high frequency iron loss.
【００１０】第２に、上記珪素鋼板において、鋼板表層
のＳｉ濃度が実質的に６．５ｗｔ．％であることを特徴
とする高周波鉄損の極めて低い珪素鋼板を提供するもの
である。Second, in the silicon steel sheet, the Si concentration in the surface layer of the steel sheet is substantially 6.5 wt. %, Provided is a silicon steel sheet having an extremely low high-frequency iron loss.
【００１１】第３に、Ｃ≦０．０２ｗｔ．％、０．０５
ｗｔ．％≦Ｍｎ≦０．５ｗｔ．％、Ｐ≦０．０１ｗｔ．
％、Ｓ≦０．０２ｗｔ．％、０．００１ｗｔ．％≦ｓｏ
Ｉ．Ａｌ≦０．０６ｗｔ．％、Ｎ≦０．０１．ｗｔ％で
あり、Ｓｉ濃度が５〜８ｗｔ．％の部分が、鋼板の上下
両面表層から板厚深さ方向に板厚の１０％以上であっ
て、かつ板厚中心付近のＳｉ濃度が３．４ｗｔ．％以上
であることを特徴とする高周波鉄損の極めて低い珪素鋼
板を提供するものである。Third, C ≦ 0.02 wt. %, 0.05
wt. % ≦ Mn ≦ 0.5 wt. %, P ≦ 0.01 wt.
%, S ≦ 0.02 wt. %, 0.001 wt. % ≦ so
I. Al ≦ 0.06 wt. %, N ≦ 0.01. wt%, and the Si concentration is 5 to 8 wt. % Is 10% or more of the sheet thickness in the thickness direction from the upper and lower surface layers of the steel sheet, and the Si concentration near the center of the sheet thickness is 3.4 wt. % Or less, and a silicon steel sheet having extremely low high frequency iron loss.
【００１２】[0012]
【発明の実施の形態】以下本発明について詳細に説明す
る。本発明に係る珪素鋼板は、基本的には、鋼板表層の
Ｓｉ濃度が鋼板の板厚中心部のＳｉ濃度よりも高い珪素
鋼板であって、かつ板厚中心のＳｉ濃度が３．４ｗｔ．
％以上、鋼板表層のＳｉ濃度が５ｗｔ．％以上である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. Basically, the silicon steel sheet according to the present invention is a silicon steel sheet in which the Si concentration in the surface layer of the steel sheet is higher than the Si concentration in the center of the thickness of the steel sheet, and the Si concentration in the center of the thickness is 3.4 wt.
% Or more, and the Si concentration in the surface layer of the steel sheet is 5 wt. % Or more.
【００１３】図１は、板厚方向にＳｉ濃度分布を形成し
た場合における板厚中心のＳｉ濃度と鉄損Ｗ0.5/20k
（周波数２０ｋＨｚ、磁束密度０．５ｋＧａｕｓｓでの
鉄損値）との関係を示す図である。FIG. 1 shows the Si concentration at the center of the thickness and the iron loss W0.5 / 20k when the Si concentration distribution is formed in the thickness direction.
It is a figure which shows the relationship with (frequency 20kHz, magnetic flux density 0.5 iron loss value in Gauss).
【００１４】なお、Ｓｉ濃度はサンブル断面についてＥ
ＰＭＡ（電子線プローブマイクロアナライザ）で分析し
た結果である。また、ここでは、板厚０．１ｍｍの圧延
法にて製造された３ｗｔ．％Ｓｉ鋼板に対し、１２００
℃のＳｉＣＩ4雰囲気中浸珪処理を行い、その後１２０
０℃のＮ2雰囲気中で拡散処理を行って種々のＳｉ濃度
分布を形成したサンプルを用いた。Note that the Si concentration is E
It is the result of having analyzed with PMA (electron probe microanalyzer). In addition, here, 3 wt. % Si steel sheet
Silicon carbide in an atmosphere of SiCl 4 at
Samples in which various Si concentration distributions were formed by performing a diffusion treatment in an N 2 atmosphere at 0 ° C. were used.
【００１５】図１より、板厚中心部のＳｉ量を３．４ｗ
ｔ．％以上とすれば、Ｆｅ−Ｓｉ合金系で最も軟磁気特
性の優れている６．５ｗｔ．％珪素鋼板の鉄損値Ｗ0.5/
20k＝６．９Ｗ／ｋｇと同等かまたはそれよりも低い高
周波鉄損が得られることがわかる。したがって、本発明
では板厚中心部のＳｉ量を３．４ｗｔ．％以上と規定す
る。加工性およびより低い鉄損値を得る観点から、板厚
中心部のＳｉ量を７ｗｔ．％以下とすることが好まし
い。FIG. 1 shows that the Si content at the center of the plate thickness is 3.4 watts.
t. % Or more, 6.5 wt. % Silicon steel sheet iron loss value W0.5 /
It can be seen that a high-frequency iron loss equal to or lower than 20k = 6.9 W / kg can be obtained. Therefore, in the present invention, the Si content at the center of the plate thickness is set to 3.4 wt. % Or more. From the viewpoint of obtaining workability and a lower iron loss value, the Si content at the center of the plate thickness is set to 7 wt. % Is preferable.
【００１６】図２は、図１に示された試料に対して、鋼
板表層のＳｉ量と鉄損Ｗ0.5/20kとの関係を示す図であ
る。図２より、鋼板表層のＳｉ量を５ｗｔ．％以上とす
ることにより、６．５ｗｔ．％珪素鋼板の鉄損値Ｗ0.5/
20k＝６．９Ｗ／ｋｇよりも低い高周波鉄損が得られる
ことがわかる。また、Ｓｉを５．５ｗｔ．％以上とする
ことにより、より低い高周波鉄損が得られ、特にＳｉが
６．５ｗｔ．％の場合に、Ｗ0.5/20k＝４．６Ｗ／ｋｇ
という著しく低い高周波鉄損を示した。このことから、
表層Ｓｉ濃度は５ｗｔ．％以上とする必要があり、好ま
しくは５．５ｗｔ．％以上、さらに好ましくは６．５ｗ
ｔ．％である。FIG. 2 is a diagram showing the relationship between the amount of Si in the surface layer of the steel sheet and the iron loss W0.5 / 20k for the sample shown in FIG. As shown in FIG. % Or more, 6.5 wt. % Silicon steel sheet iron loss value W0.5 /
It is understood that a high-frequency iron loss lower than 20k = 6.9 W / kg can be obtained. Also, 5.5 wt. %, A lower high-frequency iron loss can be obtained, and in particular, 6.5 wt. %, W0.5 / 20k = 4.6W / kg
It showed a remarkably low high-frequency iron loss. From this,
The surface Si concentration is 5 wt. % Or more, preferably 5.5 wt. % Or more, more preferably 6.5 w
t. %.
【００１７】表層からＳｉ濃度が５ｗｔ．％以上である
部分の深さ割合は１０％以上であることが好ましく、１
５〜２５％であることが一層好ましい。これにより確実
に低い高周波鉄損を得ることができる。なお、鋼板表層
の高Ｓｉ濃度部分のＳｉ濃度の上限は、鉄損特性上から
は特に規定されないが、Ｓｉ濃度が８ｗｔ．％を超える
と鋼板の加工性が著しく低下することから、８ｗｔ．％
以下であることが好ましい。From the surface layer, a Si concentration of 5 wt. % Is preferably 10% or more, and preferably 1% or more.
More preferably, it is 5 to 25%. Thereby, a low-frequency iron loss can be reliably obtained. Note that the upper limit of the Si concentration in the high Si concentration portion of the steel sheet surface layer is not particularly limited from the viewpoint of iron loss characteristics, but the Si concentration is 8 wt. %, The workability of the steel sheet is significantly reduced. %
The following is preferred.
【００１８】このように表層Ｓｉ濃度が高く、板厚中心
部が低Ｓｉである材料は特許第２５４１３８３号、特開
平６−１７２０２号公報および特開平９−１８４０５１
号公報に開示されている。しかし、特許第２５４１３８
号は、浸珪処理で６．５ｗｔ．％珪素鋼板を製造する
際、生産性を上げるべく拡散処理時間を短縮した結果と
して得られる表層Ｓｉ濃度が高い珪素鋼板を提案してお
り、鉄損は６．５ｗｔ．％珪素鋼板と同等である。ま
た、特開平６−１７２０２号公報は、６．５％珪素鋼板
の加工性を改善するべく表層だけを６．５ｗｔ．％Ｓｉ
としたものであり、鉄損は６．５ｗｔ．％珪素鋼板に比
べ劣化するとしている。さらに、特開平９−１８４０５
１号公報は、残留磁束密度を低下させるため表層高Ｓｉ
鋼板を提案しており、本発明と目的が異なっている。鉄
損については５０Ｈｚの鉄損は表層Ｓｉの高い材料が低
いとしている。しかし、周波数が高くなると一般には鉄
損は全体のＳｉ量に支配されると通常考えられ、板厚中
心部のＳｉ量が低い材料は鉄損特性が劣るとされてい
る。As described above, materials having a high surface layer Si concentration and a low Si thickness center portion are disclosed in Japanese Patent No. 2541383, JP-A-6-17202 and JP-A-9-184051.
No. 6,086,045. However, Patent 254138
No. was 6.5 wt. %, A silicon steel sheet having a high surface Si concentration obtained as a result of shortening the diffusion processing time in order to increase the productivity in order to increase productivity has a core loss of 6.5 wt. % Silicon steel sheet. Also, Japanese Patent Application Laid-Open No. 6-17202 discloses that 6.5% by weight of only the surface layer is used to improve the workability of a 6.5% silicon steel sheet. % Si
The iron loss was 6.5 wt. It is said that it deteriorates as compared with the% silicon steel sheet. Further, Japanese Patent Application Laid-Open No. 9-18405
No. 1 discloses a high surface layer Si to reduce the residual magnetic flux density.
A steel plate is proposed, and the purpose is different from the present invention. Regarding the iron loss at 50 Hz, a material having a high surface layer Si has a low iron loss. However, it is generally considered that the iron loss is generally governed by the total amount of Si when the frequency increases, and it is said that a material having a low Si amount at the center of the sheet thickness has poor iron loss characteristics.
【００１９】これに対して本発明は、このような従来の
技術常識とは異なり、板厚方向に板厚中心のほうがＳｉ
濃度の低い濃度勾配を形成し、板厚中心のＳｉ濃度およ
び鋼板表層のＳｉ濃度を特定の範囲に規定することによ
り、高周波鉄損が極めて低い材料が得られるという初め
て見出された知見に基づくものである。On the other hand, in the present invention, unlike the conventional common sense, the center of the sheet thickness in the sheet thickness direction
Based on the first finding that a material with extremely low high-frequency iron loss can be obtained by forming a concentration gradient with a low concentration and defining the Si concentration at the center of the plate thickness and the Si concentration in the surface layer of the steel plate in specific ranges. Things.
【００２０】本発明において、Ｓｉ以外の成分は特に限
定されるものではなく、通常この種の鋼板として用いら
れる範囲であればよい。すなわち、Ｃ≦０．０２ｗｔ．
％、０．０５ｗｔ．％≦Ｍｎ≦０．５ｗｔ．％、Ｐ≦
０．０１ｗｔ．％、Ｓ≦０．０２ｗｔ．％、０．００１
ｗｔ．％≦ｓｏｌ．Ａｌ≦０．０６ｗｔ．％、Ｎ≦０．
０１ｗｔ．％の範囲が好ましい。In the present invention, the components other than Si are not particularly limited, and may be any range as long as they are usually used as this type of steel sheet. That is, C ≦ 0.02 wt.
%, 0.05 wt. % ≦ Mn ≦ 0.5 wt. %, P ≦
0.01 wt. %, S ≦ 0.02 wt. %, 0.001
wt. % ≦ sol. Al ≦ 0.06 wt. %, N ≦ 0.
01 wt. % Is preferred.
【００２１】Ｃは多量に含有されると磁気時効を引き起
こすため、０．０２ｗｔ．％以下とすることが好まし
い。特性上、その下限は特に存在しないが、経済的に除
去する観点からは０．００１ｗｔ．％とすることが好ま
しい。If C is contained in a large amount, it causes magnetic aging. % Is preferable. Although there is no particular lower limit in terms of characteristics, 0.001 wt. % Is preferable.
【００２２】Ｍｎは多量に含有されると鋼板が脆くなる
ため、０．５ｗｔ．％以下とすることが好ましい。ま
た、その含有量が低過ぎると、熱延工程で破断や表面キ
ズを誘発するため、０．０５ｗｔ．％以上であることが
好ましい。If Mn is contained in a large amount, the steel sheet becomes brittle. % Is preferable. On the other hand, if the content is too low, breakage and surface flaws are induced in the hot rolling process. % Is preferable.
【００２３】Ｐは磁気特性から見ると好ましい元素であ
るが、多量に含有されると鋼板の加工性を劣化させるた
め、０．０１ｗｔ．％であることが好ましい。特性上、
その下限は特に存在しないが、経済的に除去する観点か
らは０．００１ｗｔ．％とすることが好ましい。P is a preferable element from the viewpoint of magnetic properties. However, when P is contained in a large amount, the workability of the steel sheet is deteriorated. %. Due to the characteristics,
There is no particular lower limit, but from the viewpoint of economical removal, 0.001 wt. % Is preferable.
【００２４】Ｓは加工性を劣化させるため、０．０２ｗ
ｔ．％以下とすることが好ましい。特性上、その下限は
特に存在しないが、経済的に除去する観点からは０．０
０１ｗｔ．％とすることが好ましい。Since S degrades the workability, 0.02w
t. % Is preferable. Although there is no particular lower limit on the characteristics, from the viewpoint of economical removal, 0.0 is preferred.
01 wt. % Is preferable.
【００２５】ｓｏｌ．Ａ１は同じく加工性を害するた
め、０．０６ｗｔ．％以下とすることが好ましい。一
方、脱酸剤としての必要性からその０．００１ｗｔ．％
以上が好ましい。Sol. A1 also impairs workability, so 0.06 wt. % Is preferable. On the other hand, 0.001 wt. %
The above is preferred.
【００２６】Ｎは多量に含有されると窒化物を形成して
磁気特性を劣化させるため、０．０１ｗｔ．％以下であ
ることが好ましい。特性上、その下限は特に存在しない
が、現在の製鋼技術では０．０００１ｗｔ．％が事実上
の下限となる。When N is contained in a large amount, it forms nitrides and deteriorates magnetic properties. % Is preferable. Although there is no particular lower limit in terms of characteristics, 0.0001 wt. % Is effectively the lower limit.
【００２７】なお、本発明においては、鋼板表層の高Ｓ
ｉ濃度部分を形成する手法はＣＶＤ、ＰＶＤその他いず
れの方法でもよく、特に限定されるものではない。ま
た、本発明の効果は珪素鋼板の板厚には依存せず、いず
れの板厚であっても本発明に規定された範囲とすること
で鉄損を著しく低減させることができるが、特に板厚
０．２ｍｍ以下の鋼板に対して有効である。さらに、Ｓ
ｉの板厚方向分布は、鋼板形状の観点からは上下面対称
であることが好ましいが、本発明の効果は板厚方向のＳ
ｉ分布が上下面非対称であっても得られるものであり、
鋼板形状が保てる範囲であれば必ずしも上下面対称であ
る必要はない。さらにまた、本発明は高周波鉄損が極め
て低いことが特徴であるが、その中でもより低磁束密度
領域で有効である。In the present invention, the high S of the steel sheet surface layer
The method for forming the i-concentration portion may be CVD, PVD or any other method, and is not particularly limited. In addition, the effect of the present invention does not depend on the thickness of the silicon steel sheet, and iron loss can be significantly reduced by setting the thickness within the range specified in the present invention regardless of the thickness of the silicon steel sheet. It is effective for steel plates having a thickness of 0.2 mm or less. Furthermore, S
The distribution of i in the thickness direction is preferably symmetrical in the vertical direction from the viewpoint of the shape of the steel sheet.
i is obtained even if the distribution is asymmetrical in the upper and lower surfaces,
It is not necessarily required to be vertically symmetrical as long as the shape of the steel plate can be maintained. Furthermore, the present invention is characterized by extremely low high-frequency iron loss, and is particularly effective in a lower magnetic flux density region.
【００２８】[0028]
【実施例】以下、本発明の実施例について説明する。 （実施例１）表１の組成を有する板厚０．１ｍｍの鋼板
を圧延法にて作製し、１２００℃ののＳｉＣｌ4雰囲気
中で浸珪処理を行い、その後１２００℃のＮ2雰囲気中
で拡散処理を行って種々のＳｉ濃度分布を有する珪素鋼
板を作製した。Ｓｉ濃度分布はサンブル断面についてＥ
ＰＭＡ（電子線ブローブマイクロアナライザ）で分析し
た。Ｓｉ以外の元素の量は、浸珪、拡散処理の前後でほ
とんど変化しなかった。Embodiments of the present invention will be described below. (Example 1) A steel sheet having a composition of Table 1 and having a thickness of 0.1 mm was prepared by a rolling method, subjected to a siliconizing treatment in a SiCl 4 atmosphere at 1200 ° C, and then in a N 2 atmosphere at 1200 ° C. Diffusion treatment was performed to produce silicon steel sheets having various Si concentration distributions. The Si concentration distribution is E
The analysis was performed with a PMA (electron probe microanalyzer). The amounts of the elements other than Si hardly changed before and after the siliconizing and diffusion treatment.
【００２９】[0029]
【表１】 [Table 1]
【００３０】このようにして作製した鋼板から外径３１
ｍｍ、内径１９ｍｍのリング試料を採取し、周波数２０
ｋＨｚ、磁束密度０．０５Ｔでの交流磁気特性を測定し
た。結果を表２に示す。なお、比較のために板厚０．１
ｍｍの６．５ｗｔ．％珪素鋼板からも外径３１ｍｍ、内
径１９ｍｍのリング試料を採取し、周波数２０ｋＨｚ、
磁束密度０．０５Ｔでの交流磁気特性を測定したとこ
ろ、鉄損値はＷ0.5/20k＝６．９４Ｗ／ｋｇであった。From the steel sheet produced in this way, the outer diameter 31
mm, a ring sample with an inner diameter of 19 mm
Alternating magnetic properties at kHz and a magnetic flux density of 0.05 T were measured. Table 2 shows the results. For comparison, a plate thickness of 0.1
6.5 wt. % Silicon steel sheet, a ring sample having an outer diameter of 31 mm and an inner diameter of 19 mm was collected,
When the AC magnetic characteristics at a magnetic flux density of 0.05 T were measured, the iron loss value was W0.5 / 20k = 6.94 W / kg.
【００３１】[0031]
【表２】 [Table 2]
【００３２】図１は、表２の結果に基づいて、鋼板板厚
中心部のＳｉ量と鉄損Ｗ0.5/20kとの関係を示す図であ
る。図１より、鋼板板厚中心部のＳｉ量を３．４ｗｔ．
％以上とすれば、６．５ｗｔ．％珪素鋼板の鉄損値であ
る６．９４Ｗ／ｋｇと同等かそれより低い高周波鉄損値
が得られることが確認された。FIG. 1 is a diagram showing the relationship between the Si content at the center of the steel sheet thickness and the iron loss W0.5 / 20k based on the results in Table 2. As shown in FIG.
%, 6.5 wt. It was confirmed that a high-frequency iron loss value equal to or lower than 6.94 W / kg, which is the iron loss value of the% silicon steel sheet, was obtained.
【００３３】図２は、表２の結果に基づいて、鋼板表層
のＳｉ量と鉄損Ｗ0.5/20kとの関係を示す図である。図
２より、鋼板表層のＳｉ量を５ｗｔ．％以上とすること
により、６．５ｗｔ．％珪素鋼板の鉄損値Ｗ0.5/20k＝
６．９４Ｗ／ｋｇよりも低い高周波鉄損が得られること
が確認された。また、Ｓｉを５．５ｗｔ．％以上とする
ことにより、より低い高周波鉄損が得られ、特にＳｉが
６．５ｗｔ．％の場合に、Ｗ0.5/20k＝４．６Ｗ／ｋｇ
という著しく低い高周波鉄損を示すことが確認された。FIG. 2 is a diagram showing the relationship between the amount of Si in the surface layer of the steel sheet and the iron loss W0.5 / 20k based on the results in Table 2. As shown in FIG. % Or more, 6.5 wt. % Silicon steel sheet iron loss value W0.5 / 20k =
It was confirmed that a high-frequency iron loss lower than 6.94 W / kg was obtained. Also, 5.5 wt. %, A lower high-frequency iron loss can be obtained, and in particular, 6.5 wt. %, W0.5 / 20k = 4.6W / kg
It was confirmed that the steel showed a very low high-frequency iron loss.
【００３４】[0034]
【発明の効果】以上説明したように、本発明によれぱ、
加工性を損なうことなく、かつ板厚を低減することなし
に、高周波鉄損の極めて低い珪素鋼板を得ることができ
る。As described above, according to the present invention,
A silicon steel sheet having extremely low high-frequency iron loss can be obtained without impairing workability and without reducing the sheet thickness.
【図１】板厚方向にＳｉ濃度分布を形成した場合におけ
る板厚中心のＳｉ濃度と鉄損Ｗ0.5/20kとの関係を示す
図。FIG. 1 is a view showing the relationship between the Si concentration at the center of the plate thickness and the iron loss W0.5 / 20k when a Si concentration distribution is formed in the plate thickness direction.
【図２】板厚方向にＳｉ濃度分布を形成した場合におけ
る鋼板表層のＳｉ量と鉄損Ｗ0.5/20kとの関係を示す
図。FIG. 2 is a view showing the relationship between the amount of Si in the surface layer of a steel sheet and the iron loss W0.5 / 20k when a Si concentration distribution is formed in the thickness direction.
Claims (3)
濃度よりも高く、かつ板厚中心のＳｉ濃度が３．４ｗ
ｔ．％以上、鋼板表層のＳｉ濃度が５ｗｔ．％以上であ
ることを特徴とする高周波鉄損の極めて低い珪素鋼板。1. The method according to claim 1, wherein the Si concentration in the surface layer of the steel sheet is lower than the Si concentration in the central part of the steel sheet.
Concentration is higher than the concentration and the Si concentration at the center of the plate thickness is 3.4 w
t. % Or more, and the Si concentration in the surface layer of the steel sheet is 5 wt. % Of silicon steel sheet having extremely low high frequency iron loss.
ｔ．％であることを特徴とする請求項１に記載の高周波
鉄損の極めて低い珪素鋼板。2. The steel sheet having a surface layer having a Si concentration of substantially 6.5 watts.
t. %, Wherein the silicon steel sheet has an extremely low high-frequency iron loss according to claim 1.
％≦Ｍｎ≦０．５ｗｔ．％、Ｐ≦０．０１ｗｔ．％、Ｓ
≦０．０２ｗｔ．％、０．００１ｗｔ．％≦ｓｏＩ．Ａ
ｌ≦０．０６ｗｔ．％、Ｎ≦０．０１．ｗｔ％であり、
Ｓｉ濃度が５〜８ｗｔ．％の部分が、鋼板の上下両面表
層から板厚深さ方向に板厚の１０％以上であって、かつ
板厚中心付近のＳｉ濃度が３．４ｗｔ．％以上であるこ
とを特徴とする高周波鉄損の極めて低い珪素鋼板。3. C ≦ 0.02 wt. %, 0.05 wt.
% ≦ Mn ≦ 0.5 wt. %, P ≦ 0.01 wt. %, S
≦ 0.02 wt. %, 0.001 wt. % ≦ soI. A
l ≦ 0.06 wt. %, N ≦ 0.01. wt%,
When the Si concentration is 5 to 8 wt. % Is 10% or more of the sheet thickness in the thickness direction from the upper and lower surface layers of the steel sheet, and the Si concentration near the center of the sheet thickness is 3.4 wt. % Of silicon steel sheet having extremely low high frequency iron loss.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11009398A JP3948112B2 (en) | 1998-04-07 | 1998-04-07 | Silicon steel sheet |
| PCT/JP1999/001063 WO1999046417A1 (en) | 1998-03-12 | 1999-03-05 | Silicon steel sheet and method for producing the same |
| KR1019997009343A KR100334860B1 (en) | 1998-03-12 | 1999-03-05 | Silicon steel sheet and method for producing the same |
| US09/423,509 US6527876B2 (en) | 1998-03-12 | 1999-03-05 | Silicon steel sheet and method for producing the same |
| EP99939203A EP0987341A4 (en) | 1998-03-12 | 1999-03-05 | Silicon steel sheet and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11009398A JP3948112B2 (en) | 1998-04-07 | 1998-04-07 | Silicon steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11293422A true JPH11293422A (en) | 1999-10-26 |
| JP3948112B2 JP3948112B2 (en) | 2007-07-25 |
Family
ID=14526860
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11009398A Expired - Lifetime JP3948112B2 (en) | 1998-03-12 | 1998-04-07 | Silicon steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3948112B2 (en) |
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