JPH09118922A - Manufacture of grain-oriented silicon steel sheet having high space factor - Google Patents
Manufacture of grain-oriented silicon steel sheet having high space factorInfo
- Publication number
- JPH09118922A JPH09118922A JP29725595A JP29725595A JPH09118922A JP H09118922 A JPH09118922 A JP H09118922A JP 29725595 A JP29725595 A JP 29725595A JP 29725595 A JP29725595 A JP 29725595A JP H09118922 A JPH09118922 A JP H09118922A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- annealing
- silicon steel
- grain
- oriented silicon
- 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.)
- Withdrawn
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は主として変圧器その
他の電気機器等の鉄芯として利用される一方向性珪素鋼
板の製造方法に関するものであり、特に仕上げ焼鈍皮膜
を形成させないことを目的として非水和性酸化物を焼鈍
分離剤として用いるさいに焼鈍分離剤の鋼板への焼付に
よる占積率劣化を抑制しようとするものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a unidirectional silicon steel sheet mainly used as an iron core for transformers and other electric devices, and particularly for the purpose of not forming a finish annealing film. When using a hydratable oxide as an annealing separator, it is intended to suppress the deterioration of the space factor due to the baking of the annealing separator on the steel sheet.
【０００２】[0002]
【従来の技術】多くの電気機器に磁気鉄芯として用いら
れる一方向性珪素鋼板は、Ｓｉを０．８〜４．８％含有
し、製品の結晶組織を｛１１０｝〈００１〉方位に高度
に集積させた鋼板である。方向性珪素鋼板の一般的な製
造プロセスは概略以下の通りである．Ｓｉを４％以下含
有する珪素鋼スラブを熱延してホットコイルとし、熱延
板焼鈍を施すかあるいは施さずに、１回もしくは中間焼
鈍を挟む２回の冷延により最終板厚に仕上げ、湿潤雰囲
気中の連続焼鈍により脱炭を行なうとともにＳｉＯ2 を
主体とするサブスケールを形成させる。なお、二次再結
晶のインヒビターとしては一般にＭｎＳ、ＭｎＳｅ、Ａ
ｌＮなどが用いられるが、ＡｌＮのインヒビターを強化
するため、ＮＨ3 などを含む雰囲気中で焼鈍を行なうこ
とにより窒化処理を施すこともある。2. Description of the Related Art Unidirectional silicon steel sheets used as magnetic iron cores in many electric appliances contain 0.8 to 4.8% of Si and have a crystal structure of the product in the {110} <001> orientation. It is a steel plate that has been accumulated in. The general manufacturing process of grain-oriented silicon steel sheet is as follows. A silicon steel slab containing 4% or less of Si is hot-rolled to form a hot coil, and with or without hot-rolled sheet annealing, finished to a final sheet thickness by cold rolling once or twice with intermediate annealing sandwiched, Decarburization is performed by continuous annealing in a wet atmosphere, and a subscale mainly composed of SiO 2 is formed. As the inhibitor of secondary recrystallization, MnS, MnSe, A are generally used.
Although 1N or the like is used, nitriding treatment may be performed by annealing in an atmosphere containing NH 3 or the like in order to strengthen the AlN inhibitor.
【０００３】続いてＭｇＯを主体とする焼鈍分離剤を水
に懸濁してスラリー状にして塗布、乾燥の後コイルに巻
き取り、バッチ炉で高温仕上げ焼鈍を行う。この高温仕
上げ焼鈍により、鋼板中においては優れた磁気特性を発
揮するゴス方位の二次再結晶粒が発達し、一方鋼板表面
においては焼鈍分離剤中のＭｇＯとサブスケール中のＳ
ｉＯ2 が反応してフォルステライトを主体とするグラス
皮膜が形成される。仕上げ焼鈍後の方向性珪素鋼板には
必要に応じて絶縁コーティングが施される。Subsequently, an annealing separating agent containing MgO as a main component is suspended in water to form a slurry, which is dried, wound on a coil, and then subjected to high temperature finish annealing in a batch furnace. By this high-temperature finish annealing, goth-oriented secondary recrystallized grains exhibiting excellent magnetic properties are developed in the steel sheet, while MgO in the annealing separator and S in the subscale are developed on the steel sheet surface.
iO 2 reacts to form a glass film mainly composed of forsterite. An insulating coating is applied to the grain-oriented silicon steel sheet after finish annealing as needed.
【０００４】方向性鋼板に求められる製品特性として、
まず、鉄損（Ｗ17/50 で代表される）が低いことが要求
される。特に、最近では地球環境保全や省エネルギーの
見地から、電力損失の少ない鉄芯材料すなわち鉄損の低
い方向性珪素鋼板が求められている。鉄損が低いほど発
電機、変圧器等に使用された場合の変換ロスが減少する
からである。方向性珪素鋼板の鉄損値を低減させる手段
としては、鋼板板厚の減少、鋼中Ｓｉ含有量の増加、鋼
板の高磁束密度化、皮膜による鋼板への張力付与などが
検討されてきた。最近では鋼板に線状の歪や溝を導入す
る、磁区制御技術も開発されている。これらの鉄損低減
技術は工業的にはほぼ完成されたと言ってよく、さらな
る低鉄損化を図るためには新しい手段を開発する必要が
ある。最近注目されている課題は、鋼板と皮膜界面の平
坦化である。現行の方向性珪素鋼板においてはグラス皮
膜と鋼板との界面の凹凸が激しく、磁化過程における磁
壁移動を阻害している。したがってグラス皮膜のない方
向性珪素鋼板を製造できるならば、さらなる低鉄損化が
期待される。Product characteristics required for grain-oriented steel sheets include:
First, low iron loss (represented by W 17/50 ) is required. In particular, recently, from the viewpoint of global environment protection and energy saving, there has been a demand for an iron core material with low power loss, that is, a grain-oriented silicon steel sheet with low iron loss. This is because the lower the iron loss, the smaller the conversion loss when used in a generator, transformer, etc. As means for reducing the iron loss value of the grain-oriented silicon steel sheet, reduction of the steel sheet thickness, increase of Si content in the steel, increase of magnetic flux density of the steel sheet, application of tension to the steel sheet by a coating have been studied. Recently, magnetic domain control technology has been developed that introduces linear strains and grooves into the steel sheet. It can be said that these iron loss reduction technologies are almost completed industrially, and it is necessary to develop new means in order to further reduce the iron loss. An issue that has recently received attention is the flattening of the interface between the steel sheet and the coating. In the current grain-oriented silicon steel sheet, the interface between the glass film and the steel sheet is severely uneven, which hinders domain wall movement during the magnetization process. Therefore, if a grain-oriented silicon steel sheet without a glass coating can be produced, further reduction in iron loss is expected.
【０００５】鉄損のほかに方向性珪素鋼板に求められる
項目は、打ち抜き性や剪断性といった加工のしやすさで
ある。すなわち、鉄芯は金型による打ち抜きもしくは剪
断によって所定形状に加工された方向性珪素鋼板の積層
によって製造される。打ち抜きのさいに問題となるのは
返りである。返りが大きくなると鉄芯積層体において端
面短絡が起こり、鉄損の異常増加が起こる。現行の方向
性珪素鋼板の表面には前述のようにフォルステライトを
主体とするグラス皮膜が形成されているが、この皮膜は
硬質である。したがって、打ち抜きのための金型の摩耗
が激しく、打ち抜き返りを防止するためには金型の再研
磨あるいは交換を頻繁に行わなければならない。これは
作業性を著しく低下させ、また、コストの上昇を招く。In addition to iron loss, another requirement for grain-oriented silicon steel sheets is the ease of processing such as punchability and shearability. That is, the iron core is manufactured by stacking grain-oriented silicon steel sheets processed into a predetermined shape by punching or shearing with a die. Returning is a problem when punching. When the return is large, an end face short circuit occurs in the iron core laminated body and an abnormal increase in iron loss occurs. As described above, the glass film mainly composed of forsterite is formed on the surface of the existing grain-oriented silicon steel sheet, but this film is hard. Therefore, the die for punching is heavily worn, and the die must be frequently re-polished or replaced in order to prevent punching back. This remarkably lowers workability and raises cost.
【０００６】したがってより優れた方向性電磁鋼板、す
なわち、鉄損がより低いあるいは打ち抜きおよび剪断性
がより改善された方向性電磁鋼板を製造するためには、
仕上げ焼鈍時のグラス皮膜形成を防止すればよいことに
なる。Therefore, in order to produce a better grain-oriented electrical steel sheet, that is, a grain-oriented electrical steel sheet having lower iron loss or improved punching and shearing properties,
It is only necessary to prevent the formation of glass film during finish annealing.
【０００７】さらに求められる項目は占積率である。占
積率は積層した鉄芯の実重量と計算した重量（体積×比
重）との比であり、１００％に近いことが望ましい。す
なわち、占積率が低い場合には一定の設計値を有するト
ランスを作るための珪素鋼板の重量が増加し、トランス
がコンパクトにならなくなり、また実質的な磁束密度が
大きくなって鉄損が増加してしまう。一般的には、占積
率を決定する重要な因子は鋼板に施される絶縁コーティ
ングの厚さとその表面粗度である。A further required item is the space factor. The space factor is the ratio of the actual weight of the laminated iron core to the calculated weight (volume × specific gravity), and is preferably close to 100%. That is, when the space factor is low, the weight of the silicon steel plate for making a transformer having a constant design value increases, the transformer cannot be made compact, and the substantial magnetic flux density increases and iron loss increases. Resulting in. Generally, the important factor that determines the space factor is the thickness of the insulating coating applied to the steel sheet and its surface roughness.
【０００８】仕上げ焼鈍においてグラス皮膜を形成させ
ないために、ＳｉＯ2 系酸化物に対して不活性な酸化物
を焼鈍分離剤として用いる方法が提案されている。例え
ば、アメリカ特許第３，７８５，８８２号においては高
純度の粗粒アルミナを用いてグラス皮膜形成を防止する
方法が開示されている。グラス皮膜が無くかつ鉄損の低
い方向性珪素鋼板の製造方法として、本発明者らは脱炭
焼鈍板の酸化層を酸洗等により除去しアルミナ等の焼鈍
分離剤を用いて仕上げ焼鈍を行う方法（特願平５−４３
８１０）や、アルカリ金属不純物の多い焼鈍分離剤を使
用する方法（特願平７−１２０３４５）を提案してい
る。これらの製造法によって得られた方向性珪素鋼板に
絶縁皮膜を施すならば、アメリカ特許第３，７８５，８
８２号による場合は打ち抜きおよび剪断性の優れた珪素
鋼板が得られ、特願平５−４３８１０や特願平７−１２
０３４５による場合は、極めて鉄損の低い珪素鋼板が得
られる。In order to prevent the formation of a glass film during finish annealing, a method has been proposed in which an oxide inert to SiO 2 type oxide is used as an annealing separator. For example, U.S. Pat. No. 3,785,882 discloses a method for preventing glass film formation by using high-purity coarse-grained alumina. As a method for producing a grain-oriented silicon steel sheet having no glass film and low iron loss, the present inventors remove the oxide layer of a decarburized annealed sheet by pickling or the like and perform finish annealing using an annealing separator such as alumina. Method (Japanese Patent Application No. 5-43)
810) and a method using an annealing separator containing a large amount of alkali metal impurities (Japanese Patent Application No. 7-120345). If an insulating coating is applied to the grain-oriented silicon steel sheet obtained by these manufacturing methods, US Pat.
In the case of No. 82, a silicon steel sheet having excellent punching and shearing properties can be obtained, and Japanese Patent Application No. 5-43810 and Japanese Patent Application No. 7-12.
In the case of 0345, a silicon steel sheet with extremely low iron loss can be obtained.
【０００９】しかしながら、上記のようにアルミナ等の
非水和性焼鈍分離剤を用いて仕上げ焼鈍を行うと、しば
しば軽度のアルミナ粒子の焼付きが起こる。その焼付き
量は酸素量に換算して数百ｐｐｍであり、打ち抜き性、
剪断性や鉄損値に重大な影響を及ぼす場合は少ない。し
かしながら、数百ｐｐｍのアルミナ粒子の焼付きは往々
にして占積率を悪化させる。その理由は、図２の模式図
により理解することができる。However, when the finish annealing is performed using the non-hydratable annealing separator such as alumina as described above, a slight seizure of the alumina particles occurs. The amount of seizure is several hundred ppm converted to the amount of oxygen, the punchability,
It rarely affects shearability and iron loss values. However, the seizure of several hundred ppm of alumina particles often deteriorates the space factor. The reason can be understood from the schematic diagram of FIG.
【００１０】例えば、平坦な表面を有する板厚０．２３
ｍｍの珪素鋼板に厚さ２．５μｍの絶縁皮膜を両面に施
した場合、占積率を見積もれば、２３０μｍ／（２３０
μｍ＋２．５μｍ×２）＝９７．９％となる。一方、図
２（ａ）のように鋼板１の表面にまばらではあるが直径
５μｍのアルミナ粒子２の焼付きがある場合に、厚さ
２．５μｍの絶縁皮膜３を施した場合には、図２（ｂ）
のように焼付きアルミナ粒子２の存在によって占積率は
絶縁コーティング３の厚さから期待できる値よりも劣化
する。すなわち、絶縁コーティングの厚さよりも大きい
粒径を有するアルミナ粒子の焼付きは占積率を劣化させ
る。For example, a plate thickness 0.23 having a flat surface
When a 2.5 μm thick insulating film is applied to both sides of a silicon steel sheet of mm, the space factor is estimated to be 230 μm / (230
μm + 2.5 μm × 2) = 97.9%. On the other hand, as shown in FIG. 2A, when the surface of the steel plate 1 is sparse, but the alumina particles 2 having a diameter of 5 μm are seized, and when the insulating film 3 having a thickness of 2.5 μm is applied, 2 (b)
As described above, due to the presence of the burnt-in alumina particles 2, the space factor deteriorates below the value that can be expected from the thickness of the insulating coating 3. That is, the seizure of alumina particles having a particle size larger than the thickness of the insulating coating deteriorates the space factor.
【００１１】使用するアルミナの粒径を小さくする、例
えば１μｍ以下にすれば、アルミナの焼付きの占積率へ
の影響は軽減される。しかしながらこのように微細なア
ルミナを焼鈍分離剤として用いると、アルミナ粒子が鋼
板表面全面にわたって焼き付く。このような状態はアル
ミナ等の非水和性焼鈍分離剤を用いた仕上げ焼鈍で達成
しようとする目的から逸脱するものである。なぜならば
微細なアルミナが全面に焼き付いた方向性珪素鋼板は、
打ち抜き性、剪断性が劣り、また低い鉄損値が得られな
いからである。If the particle size of the alumina used is made small, for example, 1 μm or less, the influence of the seizure of alumina on the space factor is reduced. However, when such fine alumina is used as an annealing separator, the alumina particles are seized on the entire surface of the steel sheet. Such a state deviates from the purpose to be achieved by finish annealing using a non-hydratable annealing separator such as alumina. Because the grain-oriented silicon steel sheet with fine alumina burned on the entire surface,
This is because punching properties and shearing properties are inferior and low iron loss values cannot be obtained.
【００１２】[0012]
【発明が解決しようとする課題】本発明はアルミナ等の
非水和性焼鈍分離剤の採用により、打ち抜き性、剪断性
もしくは鉄損値に優れた方向性珪素鋼板を製造するにあ
たり、アルミナの鋼板への焼付きを抑制し、占積率の劣
化を防止する方法を開発しようとするものである。The present invention employs a non-hydratable annealing separator such as alumina to produce a grain-oriented silicon steel sheet excellent in punchability, shearability or iron loss value. It aims to develop a method for suppressing seizure on the surface and preventing deterioration of the space factor.
【００１３】[0013]
【課題を解決するための手段】本発明は前記課題を解決
するものであって、珪素鋼の熱延板を熱延板焼鈍を施す
かあるいは施さずに、１回もしくは中間焼鈍を挟む２回
以上の冷間圧延により最終板厚とし、次いで脱炭焼鈍を
行い、窒化処理を施すかあるいは施さず、非水和性酸化
物を主体とする焼鈍分離剤を塗布してコイルに巻き取
り、しかる後に仕上げ焼鈍を行うことにより、仕上げ焼
鈍皮膜のない方向性珪素鋼板を製造する方法において、
焼鈍分離剤中に硼酸化合物を重量で０．２〜１．５％添
加することを特徴とする占積率の高い方向性珪素鋼板の
製造方法である。ここにおいて、焼鈍分離剤中の非水和
性酸化物がアルミナであることも特徴とする。Means for Solving the Problems The present invention is to solve the above-mentioned problems, and a silicon steel hot-rolled sheet is annealed with or without hot-rolled sheet annealing once or twice with intermediate annealing. The final thickness is obtained by cold rolling as described above, followed by decarburization annealing, and with or without nitriding treatment, applying an annealing separator mainly composed of non-hydratable oxide and winding it into a coil. In the method for producing a grain-oriented silicon steel sheet having no finish annealing film by performing finish annealing later,
A method for producing a grain-oriented silicon steel sheet having a high space factor, characterized in that a boric acid compound is added in an amount of 0.2 to 1.5% by weight in an annealing separator. Here, it is also characterized in that the non-hydratable oxide in the annealing separator is alumina.
【００１４】[0014]
【発明の実施の形態】本発明者らは非水和性焼鈍分離剤
への種々の添加物について検討し、硼酸化合物を添加す
るならば焼鈍分離剤の焼付きを低減できることを見いだ
した。図１はその効果の例を示すグラフである。すなわ
ち種々の割合でＨ3 ＢＯ3 を添加したアルミナ（Ｎａ2
Ｏ含有量０．２７％）を焼鈍分離剤とし、各種露点のも
とで脱炭焼鈍を行った珪素鋼板（板厚０．２３ｍｍ）に
これを塗布し、仕上げ焼鈍を行った後の鋼板酸素濃度を
示したものである。Ｎａを含むアルミナを焼鈍分離剤と
して用いると、ＳｉＯ2 を主体とする脱炭酸化膜は仕上
げ焼鈍中に消失し、鋼板表面が鏡面化することは、特願
平７−１２０３４５で本発明者等が開示しているとおり
である。したがって、図１における仕上げ焼鈍後鋼板酸
素量は、仕上げ焼鈍後のアルミナの焼付量を表現してい
る。すなわち、アルミナへのＨ3 ＢＯ3 添加により、そ
の添加量が０．２〜１．２％の範囲では、焼鈍分離剤ア
ルミナの鋼板への焼付き量は無添加時に比べて減少する
こと、および焼付き量を最小にするＨ3 ＢＯ3 の添加量
は０．８％程度であることを示している。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have investigated various additives to a non-hydratable annealing separator, and have found that the seizure of the annealing separator can be reduced by adding a boric acid compound. FIG. 1 is a graph showing an example of the effect. That alumina was added H 3 BO 3 in various proportions (Na 2
O content 0.27%) is used as an annealing separator, and is applied to a silicon steel sheet (sheet thickness 0.23 mm) that has been decarburized and annealed under various dew points, and the steel sheet oxygen after finish annealing is performed. It shows the concentration. When alumina containing Na is used as an annealing separator, the decarboxylation film mainly composed of SiO 2 disappears during the finish annealing, and the steel plate surface becomes a mirror surface. Is disclosed by. Therefore, the oxygen amount of the steel sheet after finish annealing in FIG. 1 represents the baking amount of alumina after finish annealing. That is, when H 3 BO 3 is added to alumina, the seizure amount of the annealing separator alumina on the steel sheet is reduced as compared with the case where no addition is made, when the addition amount is in the range of 0.2 to 1.2%, and It is shown that the amount of H 3 BO 3 added which minimizes the amount of seizure is about 0.8%.
【００１５】上記はアルミナ焼付量軽減効果が発現する
硼酸添加量範囲である。しかし後述の実施例で示すよう
に、占積率改善効果の有無で判断すると、有効な硼酸化
合物の添加量の範囲は０．２〜１．５％あることがわか
った。最大添加量が拡がっている理由は以下のように解
釈できる。鋼板に焼き付いたアルミナの形態を良く観察
してみると、Ｈ3 ＢＯ3 の添加により単にアルミナ焼付
き量が減少するのみならず、アルミナ粒子の特に粗粒成
分の焼付きの減少が著しいことが判明した。これを占積
率の観点から考えると、単に焼付きアルミナの総量を示
すに過ぎない図２から期待される以上に、Ｈ3 ＢＯ3 添
加の占積率向上効果は大きいと言える。Ｈ3 ＢＯ3 添加
により焼付きアルミナの粗粒成分が減少する傾向は焼付
き量最小を示す添加量０．８％を越えても存在する。こ
の効果により１．２〜１．５％の添加量範囲においても
占積率改善効果が存在する。The above is the range of the amount of boric acid added which produces the effect of reducing the amount of baking of alumina. However, as shown in Examples described later, it was found that the effective addition amount of the boric acid compound was in the range of 0.2 to 1.5% when judged by the presence or absence of the space factor improving effect. The reason why the maximum addition amount is expanding can be interpreted as follows. A close examination of the morphology of the alumina seized on the steel sheet shows that the addition of H 3 BO 3 not only reduces the amount of alumina seizure, but also significantly reduces the seizure of the alumina particles, especially the coarse-grained components. found. Considering this from the viewpoint of space factor, it can be said that the effect of adding H 3 BO 3 to improve the space factor is larger than expected from FIG. 2, which merely shows the total amount of seized alumina. The tendency that the coarse-grained component of the seizure alumina decreases by the addition of H 3 BO 3 exists even if the addition amount of 0.8%, which shows the minimum seizure amount, is exceeded. Due to this effect, there is a space factor improving effect even in the addition amount range of 1.2 to 1.5%.
【００１６】アルミナの焼付き、特に粗粒成分の焼付き
を軽減させ、占積率向上に役に立つ添加物はＨ3 ＢＯ3
（オルト硼酸）に限らない。水に溶けて硼酸になる酸化
硼素（Ｂ2 Ｏ3 ）は言うまでもなく、メタ硼酸（ＨＢＯ
2 ）、四硼酸（Ｈ2 Ｂ4 Ｏ7）、および各種硼酸塩でも
同様な添加量範囲で同様な効果が得られる。焼鈍分離剤
は水に懸濁したスラリーとして用いることが多いため、
硼酸塩を採用する場合はアルカリ金属の硼酸塩が利用し
やすい。また、硼酸もしくは硼酸塩添加による焼鈍分離
剤の鋼板への焼付き抑制効果は焼鈍分離剤がアルミナで
ある場合に限定されない。他の非水和性焼鈍分離剤、例
えばＴｉＯ2 、ＺｒＯ2 を用いた場合でも、同様な硼酸
もしくは硼酸化合物添加量範囲で同様な効果が得られ
る、ただしアルミナは最も安価であるため工業的価値が
高い。Additives that reduce seizure of alumina, especially seizure of coarse-grained components, and are useful for improving space factor are H 3 BO 3
Not limited to (orthoboric acid). Not to mention boron oxide (B 2 O 3 ) which dissolves in water to form boric acid, metaboric acid (HBO
2 ), tetraboric acid (H 2 B 4 O 7 ), and various borate salts also have similar effects in the same addition amount range. Since the annealing separator is often used as a slurry suspended in water,
When borate is used, alkali metal borate is easy to use. The effect of suppressing the seizure of the annealing separator on the steel sheet by adding boric acid or borate is not limited to the case where the annealing separator is alumina. Even when other non-hydratable annealing separators such as TiO 2 and ZrO 2 are used, the same effect can be obtained in the same range of the addition amount of boric acid or boric acid compound, but alumina is the cheapest and thus has an industrial value. Is high.
【００１７】[0017]
実施例１ 重量％で、Ｓｉ：３．３％、Ｍｎ：０．０７％、Ｃ：
０．０５％、Ｓ：０．０２５％を含有する板厚２．５ｍ
ｍの熱延珪素鋼帯を酸洗した後、９００℃で２分間の中
間焼鈍を挟む２回冷延法により０．３０ｍｍに冷延し
た。この冷延鋼板に対し脱炭焼鈍を施した後、表１の組
成を有する焼鈍分離剤（平均粒径１０μｍ）を水スラリ
ー化して塗布、乾燥し、仕上げ焼鈍を施した。仕上げ焼
鈍後の鋼板に燐酸塩とコロイダルシリカを主成分とする
絶縁コーティングを施した。得られた製品の磁気特性、
占積率を表１に示す。本発明の製品は占積率が硼酸無添
加および過剰添加の比較例より優れ、磁気特性も良好な
ことがわかる。Example 1 By weight%, Si: 3.3%, Mn: 0.07%, C:
Plate thickness 2.5m containing 0.05%, S: 0.025%
The hot-rolled silicon steel strip of m was pickled, and then cold-rolled to 0.30 mm by a double cold-rolling method with intermediate annealing at 900 ° C. for 2 minutes. After decarburizing and annealing this cold-rolled steel sheet, an annealing separator (average particle size 10 μm) having the composition shown in Table 1 was made into a water slurry, applied, dried, and finally annealed. After the finish annealing, the steel sheet was subjected to an insulating coating containing phosphate and colloidal silica as main components. The magnetic properties of the obtained product,
The space factor is shown in Table 1. It can be seen that the product of the present invention is superior in space factor to the comparative examples in which boric acid is not added and in excess, and the magnetic properties are also good.
【００１８】[0018]
【表１】 [Table 1]
【００１９】実施例２ 重量％で、Ｓｉ：３．３％、Ｍｎ：０．０７％、Ｃ：
０．０７％、Ｓ：０．０２５％、酸可溶性Ａｌ：０．０
２６％、Ｎ：０．００８％、Ｓｎ：０．１％を含有する
板厚２．３ｍｍの熱延珪素鋼帯を１１００℃で２分間焼
鈍し、酸洗した後０．２３ｍｍに冷延した。この冷延鋼
板に対し脱炭焼鈍を施し、そのさい生成した酸化膜を酸
洗により除去した。つづいて表２の組成を有する焼鈍分
離剤（平均粒径１０μｍ）を水スラリー化して塗布、乾
燥し、仕上げ焼鈍を施した。仕上げ焼鈍後の鋼板に燐酸
塩とコロイダルシリカを主成分とする絶縁コーティング
を施した後、レーザーを照射して磁区細分化処理を行っ
た。得られた製品の磁気特性、占積率を表２に示す。本
発明の製品は占積率が硼酸塩無添加および過剰添加の比
較例より著しく優れ、磁気特性も良好なことがわかる。Example 2 By weight%, Si: 3.3%, Mn: 0.07%, C:
0.07%, S: 0.025%, acid-soluble Al: 0.0
A hot-rolled silicon steel strip having a plate thickness of 2.3 mm and containing 26%, N: 0.008% and Sn: 0.1% was annealed at 1100 ° C. for 2 minutes, pickled, and then cold-rolled to 0.23 mm. . This cold-rolled steel sheet was subjected to decarburization annealing, and the oxide film formed at that time was removed by pickling. Subsequently, an annealing separator (average particle size: 10 μm) having the composition shown in Table 2 was made into a water slurry, applied, dried, and finally annealed. After the finish-annealing steel sheet was subjected to an insulating coating containing phosphate and colloidal silica as main components, it was irradiated with a laser to perform magnetic domain subdivision processing. Table 2 shows the magnetic properties and space factor of the obtained product. It can be seen that the product of the present invention has a significantly higher space factor than the comparative examples in which no borate is added and in which the borate is excessively added, and the magnetic properties are also good.
【００２０】[0020]
【表２】 [Table 2]
【００２１】実施例３ 重量％で、Ｓｉ：３．３％、Ｍｎ：０．１０％、Ｃ：
０．０５％、Ｓ：０．００７％、酸可溶性Ａｌ：０．０
３％、Ｎ：０．００８％、Ｓｎ：０．０５％を含有する
板厚２．３ｍｍの熱延珪素鋼帯を１１００℃で２分間焼
鈍し、酸洗した後０．２３ｍｍに冷延した。この冷延鋼
板に対し脱炭焼鈍を施し、続いて表３の組成を有する焼
鈍分離剤（平均粒径１０μｍ）を水スラリー化して塗
布、乾燥し、仕上げ焼鈍を施した。仕上げ焼鈍後の鋼板
に燐酸塩とコロイダルシリカを主成分とする絶縁コーテ
ィングを施した後、レーザーを照射して磁区細分化処理
を行った。得られた製品の磁気特性、占積率を表３に示
す。本発明の製品は占積率が硼酸化合物無添加の比較例
より著しく優れ、磁気特性も良好なことがわかる。Example 3 By weight%, Si: 3.3%, Mn: 0.10%, C:
0.05%, S: 0.007%, acid-soluble Al: 0.0
A hot-rolled silicon steel strip having a plate thickness of 2.3 mm and containing 3%, N: 0.008% and Sn: 0.05% was annealed at 1100 ° C. for 2 minutes, pickled, and then cold-rolled to 0.23 mm. . This cold-rolled steel sheet was subjected to decarburization annealing, and subsequently, an annealing separator having the composition shown in Table 3 (average particle size 10 μm) was made into a water slurry, applied, dried, and finally annealed. After the finish-annealing steel sheet was subjected to an insulating coating containing phosphate and colloidal silica as main components, it was irradiated with a laser to perform magnetic domain subdivision processing. Table 3 shows the magnetic properties and space factor of the obtained product. It can be seen that the product of the present invention is significantly superior in space factor to the comparative example in which no boric acid compound is added, and the magnetic properties are also good.
【００２２】[0022]
【表３】 [Table 3]
【００２３】[0023]
【発明の効果】従来の技術においては焼鈍分離剤として
グラス皮膜を形成しないアルミナなどの非水和性酸化物
を使用した場合に、酸化物粒子の焼付きを完全には防止
できず占積率の低下を招いていたが、本発明によってこ
のような問題を解決できた。したがってグラス皮膜を無
くすことによる方向性電磁鋼板の低鉄損化と打ち抜き性
・剪断性の向上の効果を十分に発揮させ、良好な特性の
製品を製造できる。In the prior art, when a non-hydratable oxide such as alumina which does not form a glass film is used as an annealing separator, seizure of the oxide particles cannot be completely prevented and the space factor is increased. However, the present invention can solve such a problem. Therefore, the effects of lowering the iron loss of the grain-oriented electrical steel sheet and improving the punching and shearing properties by fully eliminating the glass coating can be fully exerted, and a product with good characteristics can be manufactured.
【図面の簡単な説明】[Brief description of the drawings]
【図１】仕上げ焼鈍後鋼板酸素量と焼鈍分離剤中Ｈ3 Ｂ
Ｏ3 添加量の関係を示すグラフ[Figure 1] Oxygen content of steel sheet after finish annealing and H 3 B in annealing separator
Graph showing the relationship of O 3 addition amount
【図２】（ａ）はアルミナ粒子が焼き付いた鋼板表面、
（ｂ）はさらにそこに絶縁コーティングを施した状況を
示す模式図FIG. 2 (a) is a steel plate surface on which alumina particles are burned,
(B) is a schematic view showing a situation in which an insulating coating is further applied there
１ 鋼板 ２ アルミナ粒子 ３ 絶縁コーティング 1 Steel plate 2 Alumina particles 3 Insulation coating
Claims (2)
あるいは施さずに、１回もしくは中間焼鈍を挟む２回以
上の冷間圧延により最終板厚とし、次いで脱炭焼鈍を行
い、窒化処理を施すかあるいは施さず、非水和性酸化物
を主体とする焼鈍分離剤を塗布してコイルに巻き取り、
しかる後に仕上げ焼鈍を行うことにより、仕上げ焼鈍皮
膜のない方向性珪素鋼板を製造する方法において、焼鈍
分離剤中に硼酸化合物を重量で０．２〜１．５％添加す
ることを特徴とする占積率の高い方向性珪素鋼板の製造
方法。1. A hot-rolled sheet of silicon steel is subjected to one or two or more cold rollings with intermediate annealing, with or without hot-rolled sheet annealing, to obtain a final sheet thickness, followed by decarburization annealing. Performed, with or without nitriding treatment, coated with an annealing separator mainly composed of non-hydratable oxide and wound on a coil,
In a method for producing a grain-oriented silicon steel sheet having no finish annealing film by performing finish annealing thereafter, a boric acid compound is added to the annealing separator in an amount of 0.2 to 1.5% by weight. A method for manufacturing a grain-oriented silicon steel sheet having a high product ratio.
ナであることを特徴とする請求項１記載の占積率の高い
方向性珪素鋼板の製造方法。2. The method for producing a grain-oriented silicon steel sheet having a high space factor according to claim 1, wherein the non-hydratable oxide in the annealing separator is alumina.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29725595A JPH09118922A (en) | 1995-10-23 | 1995-10-23 | Manufacture of grain-oriented silicon steel sheet having high space factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29725595A JPH09118922A (en) | 1995-10-23 | 1995-10-23 | Manufacture of grain-oriented silicon steel sheet having high space factor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09118922A true JPH09118922A (en) | 1997-05-06 |
Family
ID=17844169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29725595A Withdrawn JPH09118922A (en) | 1995-10-23 | 1995-10-23 | Manufacture of grain-oriented silicon steel sheet having high space factor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09118922A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020149336A1 (en) * | 2019-01-16 | 2020-07-23 | 日本製鉄株式会社 | Method for manufacturing grain-oriented electrical steel sheet |
| WO2020149337A1 (en) * | 2019-01-16 | 2020-07-23 | 日本製鉄株式会社 | Method for manufacturing grain-oriented electrical steel sheet |
-
1995
- 1995-10-23 JP JP29725595A patent/JPH09118922A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020149336A1 (en) * | 2019-01-16 | 2020-07-23 | 日本製鉄株式会社 | Method for manufacturing grain-oriented electrical steel sheet |
| WO2020149337A1 (en) * | 2019-01-16 | 2020-07-23 | 日本製鉄株式会社 | Method for manufacturing grain-oriented electrical steel sheet |
| JPWO2020149336A1 (en) * | 2019-01-16 | 2021-11-25 | 日本製鉄株式会社 | Manufacturing method of grain-oriented electrical steel sheet |
| JPWO2020149337A1 (en) * | 2019-01-16 | 2021-11-25 | 日本製鉄株式会社 | Manufacturing method of grain-oriented electrical steel sheet |
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