JP2001323345A - Nonoriented silicon steel sheet having high magnetic flux density and excellent in workability, recyclability and magnetic property after strain relieving annealing - Google Patents
Nonoriented silicon steel sheet having high magnetic flux density and excellent in workability, recyclability and magnetic property after strain relieving annealingInfo
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- JP2001323345A JP2001323345A JP2000142147A JP2000142147A JP2001323345A JP 2001323345 A JP2001323345 A JP 2001323345A JP 2000142147 A JP2000142147 A JP 2000142147A JP 2000142147 A JP2000142147 A JP 2000142147A JP 2001323345 A JP2001323345 A JP 2001323345A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、主に電気機器の
鉄心材料として用いられる無方向性電磁鋼板に関し、特
にその加工性、リサイクル性および歪取り焼鈍後の磁気
特性の有利な改善を図ったものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-oriented electrical steel sheet mainly used as an iron core material of electric equipment, and particularly to an advantageous improvement of its workability, recyclability and magnetic properties after strain relief annealing. Things.
【０００２】[0002]
【従来の技術】近年、電力をはじめとするエネルギーの
節減という世界的な動きの中で、電気機器についても、
その高効率化が強く要望されている。また、電気機器を
小型化する観点から、特に鉄心材料の小型化に対する要
望も高まっている。さらに、最近では、環境への配慮か
ら、電気機器における鉄心材料のリサイクル化への対応
も急務となっている。2. Description of the Related Art In recent years, with the worldwide movement to save energy such as electric power, electric equipment has been
There is a strong demand for higher efficiency. Also, from the viewpoint of reducing the size of electric devices, there is an increasing demand for reducing the size of iron core materials. Furthermore, recently, due to environmental considerations, there is an urgent need to cope with recycling of iron core materials in electrical equipment.
【０００３】上記した電気機器の高効率化や鉄心材料の
小型化には、鉄心の素材となる電磁鋼板の磁気特性を改
善することが有効である。ここに、従来の無方向性電磁
鋼板の分野では、磁気特性のうち、特に鉄損を低減する
手段として、電気抵抗を増大させて渦電流損を低下させ
るために、SiやAl，Mn等の含有量を高める手法が一般に
用いられてきた。しかしながら、この手法では、磁束密
度の低下を免れることができないという、本質的な問題
を抱えていた。In order to improve the efficiency of the electric equipment and reduce the size of the iron core material, it is effective to improve the magnetic properties of the magnetic steel sheet used as the material of the iron core. Here, in the field of conventional non-oriented electrical steel sheets, in order to reduce eddy current loss by increasing electric resistance, as a means for reducing iron loss among magnetic properties, in particular, Si, Al, Mn, etc. Techniques for increasing the content have been commonly used. However, this method has an essential problem that a decrease in magnetic flux density cannot be avoided.
【０００４】一方、単にSiやAl等の含有量を高めるだけ
でなく、併せてＣやＳを低減すること、あるいは特開昭
５８−１５１４３号公報に記載されているようにＢを添
加したり、特開平３−２８１７５８号公報に記載されて
いるようにNiを添加したりするなど、合金成分を増加さ
せることも、一般に知られている方法である。これら合
金成分を添加する方法では、鉄損は改善されるものの、
磁束密度の改善効果は小さく満足できるものではなかっ
た。また、合金添加に伴って鋼板の硬さが上昇して加工
性が劣化するため、かような無方向性電磁鋼板を加工し
て電気機器に使用する場合の汎用性に乏しく、その用途
は極めて限定されたものとなっていた。On the other hand, in addition to simply increasing the content of Si, Al, and the like, it is also necessary to reduce C and S at the same time, or to add B as described in JP-A-58-15143. It is also a generally known method to increase the alloy component, such as adding Ni as described in JP-A-3-281758. With the method of adding these alloy components, although iron loss is improved,
The effect of improving the magnetic flux density was small and unsatisfactory. In addition, since the hardness of the steel sheet increases with the addition of the alloy and the workability deteriorates, the versatility of processing such non-oriented electrical steel sheet and using it for electrical equipment is poor, and its application is extremely It was limited.
【０００５】さらに、製造プロセスを変更し、製品板に
おける結晶方位の集積度合い、すなわち集合組織を改善
して磁気特性を向上させる方法がいくつか提案されてい
る。例えば、特開昭５８−１８１８２２号公報には、S
i： 2.8〜4.0 mass％およびAl： 0.3〜2.0 mass％を含
有する鋼に 200〜500 ℃の温度範囲で温間圧延を施し、
｛１００｝＜ＵＶＷ＞組織を発達させる方法が、そして
特開平３−２９４４２２号公報には、Si：1.5 〜4.0 ma
ss％およびAl：0.1 〜2.0 mass％を含有する鋼を熱間圧
延したのち、1000℃以上、1200℃以下の熱延板焼鈍と圧
下率：80〜90％の冷間圧延を組み合わせることによって
｛１００｝組織を発達させる方法が、それぞれ開示され
ている。Further, several methods have been proposed for improving the magnetic characteristics by improving the degree of integration of the crystal orientation in the product plate, that is, improving the texture by changing the manufacturing process. For example, Japanese Patent Application Laid-Open No. 58-181822 discloses S
i: 2.8-4.0 mass% and Al: 0.3-2.0 mass% steel is warm-rolled in a temperature range of 200-500 ° C.
A method of developing a {100} <UVW> structure is disclosed in Japanese Patent Application Laid-Open No. 3-294422.
After hot-rolling a steel containing ss% and Al: 0.1 to 2.0 mass%, a combination of hot-rolled sheet annealing at 1000 ° C or more and 1200 ° C or less and cold rolling at a reduction ratio of 80-90% is performed. Methods for developing 100% tissue are disclosed, respectively.
【０００６】しかしながら、これらの方法による磁気特
性の改善効果は、未だ満足できるものではなく、さらに
は加工性およびリサイクル性にも問題を残していた。す
なわち、鋼中にある程度以上のAlが含まれていると、ま
ず鋼板の硬さが上昇して加工性が阻害され、また鉄心材
料をリサイクルしたり、需要家でスクラップ処理する場
合に電気炉の電極を傷めるという問題があった。[0006] However, the effect of improving the magnetic properties by these methods has not been satisfactory yet, and there remains a problem in workability and recyclability. That is, if a certain amount of Al is contained in the steel, the hardness of the steel sheet first increases and the workability is impaired.In addition, when recycling the iron core material or performing scrap treatment at the customer, the electric furnace There was a problem of damaging the electrodes.
【０００７】さらに、鉄心のリサイクル材を用いてモー
タのシャフトなどを鋳造する場合、0.1 mass％以上のAl
が含まれていると、鋳込み時に溶鋼の表面酸化が進行し
て粘性が増大し、溶鋼の鋳型内充填性が悪化するため
に、健全な鋳込みが阻害されるところにも問題を残して
いた。Further, when casting a motor shaft or the like by using a recycled iron core, 0.1% by mass or more of Al
When the steel is contained, the surface oxidation of the molten steel proceeds during casting to increase the viscosity, and the filling property of the molten steel in the mold is deteriorated, so that a problem still remains where sound casting is hindered.
【０００８】[0008]
【発明が解決しようとする課題】この発明は、上記の問
題を有利に解決するもので、加工性およびリサイクル性
に優れるのはいうまでもなく、歪取り焼鈍後の磁気特性
にも優れた高磁束密度無方向性電磁鋼板を提案すること
を目的とする。SUMMARY OF THE INVENTION The present invention advantageously solves the above-mentioned problems and, needless to say, has excellent workability and recyclability as well as high magnetic properties after strain relief annealing. The purpose is to propose a magnetic flux density non-oriented electrical steel sheet.
【０００９】[0009]
【課題を解決するための手段】単にリサイクル性を改善
するだけならば、Al含有量を所定レベルまで低減すれば
良いのであるが、Al量を低減するとその分磁気特性の劣
化が避けられない。そこで、発明者らは、この点を改善
すべく鋭意研究を行った結果、低Al材であっても、Ｃと
Ｎの両者を併せて低減すると、結晶粒成長性が格段に向
上し、Al添加材と遜色のない優れた磁気特性が得られる
ことの知見を得た。また、Sbを添加すると、磁気特性上
好ましい集合組織の形成が促進されるだけでなく、鋼板
の硬さ調整にも有用であることが併せて見出された。こ
の発明は、上記の知見に立脚するものである。To simply improve the recyclability, it is sufficient to reduce the Al content to a predetermined level. However, if the Al content is reduced, the deterioration of the magnetic properties is inevitable. Therefore, the present inventors have conducted intensive studies to improve this point. As a result, even when the material is a low Al material, when both C and N are reduced, the crystal grain growth property is remarkably improved, and It has been found that excellent magnetic properties comparable to those of the additive can be obtained. It has also been found that the addition of Sb not only promotes the formation of a favorable texture in terms of magnetic properties, but is also useful for adjusting the hardness of the steel sheet. The present invention is based on the above findings.
【００１０】すなわち、この発明の要旨構成は次のとお
りである。 １．Si：1.5 〜4.0 mass％およびMn：0.005 〜2.00mass
％を含み、かつAl，ＣおよびＮをそれぞれ、Al：0.030
mass％以下、Ｃ：0.0020mass％以下、Ｎ：0.0020mass％
以下に低減し、残部はFeおよび不可避不純物の組成にな
り、さらに鉄損Ｗ15/50 ≦ 3.20 W/kgかつ磁束密度Ｂ50
≧(1.650＋0.025 ×Ｗ15/50)Ｔを満足することを特徴と
する、加工性、リサイクル性および歪取り焼鈍後の磁気
特性に優れた高磁束密度無方向性電磁鋼板。That is, the gist of the present invention is as follows. 1. Si: 1.5 to 4.0 mass% and Mn: 0.005 to 2.00 mass
%, And each of Al, C and N is 0.030
mass% or less, C: 0.0020 mass% or less, N: 0.0020 mass%
And the balance becomes Fe and unavoidable impurities, and the iron loss W 15/50 ≤ 3.20 W / kg and the magnetic flux density B 50
High magnetic flux density non-oriented electrical steel sheet excellent in workability, recyclability and magnetic properties after strain relief annealing characterized by satisfying ≧ (1.650 + 0.025 × W 15/50 ) T.
【００１１】２．上記１において、さらに Sb：0.005 〜0.50mass％を含有する組成になることを特
徴とする、加工性、リサイクル性および歪取り焼鈍後の
磁気特性に優れた高磁束密度無方向性電磁鋼板。2. The high-magnetic-flux-density non-oriented electrical steel sheet according to the above item 1, wherein the composition further contains Sb: 0.005 to 0.50 mass%, and is excellent in workability, recyclability and magnetic properties after strain relief annealing.
【００１２】３．上記１または２において、鋼板の硬さ
が 200 HV1以下であることを特徴とする、加工性、リサ
イクル性および歪取り焼鈍後の磁気特性に優れた高磁束
密度無方向性電磁鋼板。3. The high magnetic flux density non-oriented electrical steel sheet according to 1 or 2 above, wherein the steel sheet has a hardness of 200 HV1 or less and is excellent in workability, recyclability, and magnetic properties after strain relief annealing.
【００１３】[0013]
【発明の実施の形態】以下、この発明の解明経緯につい
て説明する。さて、電気機器のモータやトランスの効率
を高めるためには、これらの銅損や鉄損を低減すること
が重要であり、銅損と鉄損を同時に低減するためには、
素材の磁束密度を高めかつ鉄損を低減する必要がある。
ところが、一般に鉄損を低減するために添加するSiなど
の比抵抗増加元素は、飽和磁束密度を低下させることか
ら、鉄損および磁束密度を両立させるのは非常に困難で
あった。この点、集合組織の改善は、鉄損および磁束密
度を両立させ得る優れた手段であるが、これにも自ずか
ら限界があった。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the invention will be described below. Now, it is important to reduce the copper loss and iron loss in order to increase the efficiency of motors and transformers of electrical equipment, and to reduce copper loss and iron loss simultaneously,
It is necessary to increase the magnetic flux density of the material and reduce iron loss.
However, since an element which increases the specific resistance, such as Si, added to reduce iron loss generally lowers the saturation magnetic flux density, it was very difficult to achieve both iron loss and magnetic flux density. In this regard, the improvement of the texture is an excellent means for achieving both iron loss and magnetic flux density, but this also has its own limitations.
【００１４】このような状況下で、新たに材料を開発す
るには、まず素材の鉄損と磁束密度とをいかにバランス
させれば電気機器の高効率化につながるかを知ることが
極めて重要になる。そこで、発明者らは、最近一般的に
用いられるようになった 500ＷのブラシレスＤＣモータ
を用い、この鉄心に種々の素材を適用した場合における
モータ効率について調査した。ここで、モータ効率と
は、ＤＣモータにおける入力に対する出力の比率であ
り、92％以上であれば極めて高効率と言える。Under these circumstances, in order to develop a new material, it is very important to first know how to balance the iron loss and the magnetic flux density of the material to improve the efficiency of electric equipment. Become. Therefore, the inventors have investigated the motor efficiency when a brushless DC motor of 500 W which has recently been generally used and various materials are applied to the iron core. Here, the motor efficiency is a ratio of the output to the input in the DC motor, and it can be said that the efficiency is extremely high if it is 92% or more.
【００１５】得られた結果を図１に示す。同図に示した
ように、鉄損Ｗ15/50 が 3.2 W/kg 以下で、かつ磁束密
度Ｂ50が(1.650＋0.025 ×Ｗ15/50)Ｔ以上を満足する範
囲に素材の鉄損と磁束密度を制御することによって、極
めて良好なモータ効率が得られることが判明した。これ
は、素材の鉄損−磁束密度バランスを調整することによ
って、機器の鉄損と銅損が良好にバランスした結果であ
る。FIG. 1 shows the obtained results. As shown in the figure, the iron loss of the material falls within a range where the iron loss W 15/50 is 3.2 W / kg or less and the magnetic flux density B 50 satisfies (1.650 + 0.025 × W 15/50 ) T or more. It has been found that by controlling the magnetic flux density, extremely good motor efficiency can be obtained. This is the result of a good balance between the iron loss and the copper loss of the device by adjusting the iron loss-magnetic flux density balance of the material.
【００１６】この知見は、ＤＣモータに限らず、ＡＣ誘
導モータや小型トランスにおいても基本的には同じはず
である。そこで、鉄損および磁束密度を上記の好適範囲
に制御することを、新たな材料開発の指針とした。This finding should be basically the same for not only DC motors but also AC induction motors and small transformers. Therefore, controlling the iron loss and the magnetic flux density within the above-mentioned preferred ranges was used as a guideline for developing new materials.
【００１７】そこで次に、上記の知見を踏まえ、鉄損お
よび磁束密度が上記範囲を満足し、しかも良好な加工性
およびリサイクル性をも確保し得る、無方向電磁鋼板の
成分組成について検討した。まず、Alは、従来、磁気特
性向上のために必要であるとして添加されてきたが、加
工性およびリサイクル性を阻害することから、ここでは
Alを低減することが肝要である。Then, based on the above findings, the composition of the non-oriented electrical steel sheet was examined in which the iron loss and the magnetic flux density satisfy the above-mentioned ranges, and can also secure good workability and recyclability. First, Al has conventionally been added as necessary for improving magnetic properties, but because it hinders workability and recyclability, here
It is important to reduce Al.
【００１８】すなわち、Alは、鋼板の製造工程におい
て、鋼板表面の酸化を促進するため、圧延工程で圧延ロ
ールの磨耗を早めて圧延性を阻害するだけでなく、鋼板
の硬さを高めるために、需要家が打ち抜き加工する際に
金型の劣化を早めて作業時間やコストを増大させるな
ど、加工性に関して不利な成分である。また、電気機器
などのスクラップを利用して鋳造を行う場合に、Alが含
まれていると、鋳込み時に溶鋼の表面酸化が進行して粘
性が増大し、溶鋼の鋳型内充填性が悪化するために、健
全な鋳物が得られないことがあり、Alを含むスクラップ
はリサイクル性に乏しいものになる。That is, Al promotes oxidation of the surface of the steel sheet in the manufacturing process of the steel sheet. Therefore, Al not only accelerates the abrasion of the rolling rolls in the rolling process and impairs the rollability but also increases the hardness of the steel sheet. This is a disadvantageous component in terms of workability, such as increasing the working time and cost by accelerating the deterioration of the die when the customer performs the punching process. In addition, when casting is performed using scraps of electric equipment and the like, if Al is contained, the surface oxidation of the molten steel proceeds during casting, the viscosity increases, and the filling property of the molten steel in the mold deteriorates. In addition, a sound casting may not be obtained, and the scrap containing Al becomes poor in recyclability.
【００１９】従って、加工性およびリサイクル性を向上
させるには、Alの含有量を低減することが有効となる。
とはいえ、一方でAlの低減は、磁気特性とりわけ鉄損の
増大を招くことになる。Therefore, in order to improve workability and recyclability, it is effective to reduce the Al content.
Nevertheless, on the other hand, the reduction of Al leads to an increase in magnetic properties, especially iron loss.
【００２０】しかしながら、この点に関する発明者らの
研究によれば、Alを低減したとしても、その他の鋼中成
分を適切に調整してやれば、加工性およびリサイクル
性、さらには磁気特性の全てを満足させ得ることが、新
たに究明された。すなわち、発明者らは、数多くの実験
結果を解析するうちに、Si量が十分にあり、かつＮ量が
低い場合には、Alをほとんど添加しなくても、良好な鉄
損特性が得られることを見出した。そこで、Al量とＮ量
について、系統的にその影響を明らかにするために、以
下の実験を行った。However, according to the inventors' research on this point, even if the Al content is reduced, if the other steel components are properly adjusted, all of the workability and recyclability and the magnetic properties can be satisfied. What can be done has been newly determined. In other words, the present inventors have analyzed a large number of experimental results and found that when the amount of Si is sufficient and the amount of N is low, good iron loss characteristics can be obtained without adding Al almost. I found that. Therefore, the following experiment was conducted in order to systematically clarify the effects of the Al content and the N content.
【００２１】まず、成分としてＣ：0.002 mass％および
Mn：0.20mass％を基本成分として固定し、これにSi, Ｎ
およびAl量を種々に変化させて含有させた、種々の鋼塊
を溶製した。ついで、これらの鋼塊を、1050℃に加熱
し、熱間圧延にて2.3 mm厚としたのち、約1000℃で熱延
板焼純を施し、酸洗後、冷間圧延にて最終板厚：0.35mm
に仕上げたのち、約1000℃, 10秒間の再結晶焼鈍を施し
て製品板とした。First, C: 0.002 mass% as a component and
Mn: 0.20 mass% is fixed as a basic component, and Si, N
And various ingots containing various amounts of Al were melted. Then, these ingots were heated to 1050 ° C, hot-rolled to a thickness of 2.3 mm, then hot-rolled at about 1000 ° C, pickled, and cold-rolled to a final thickness. ： 0.35mm
After that, recrystallization annealing was performed at about 1000 ° C. for 10 seconds to obtain a product plate.
【００２２】これらの製品板から、圧延方向と平行およ
び圧延方向と直角にそれぞれサンプルを切り出し、JIS
C 2550に準拠して鉄損を測定して、その平均値を求め
た。得られた結果を図２に示す。同図に示したように、
Si量が高くかつＮ量が低い場合には、Alが 0.030mass％
以下の範囲でも、鉄損が著しく低減されることが判明し
た。From these product sheets, samples were cut out in parallel with the rolling direction and at right angles to the rolling direction, respectively.
The iron loss was measured according to C2550, and the average value was determined. FIG. 2 shows the obtained results. As shown in the figure,
When the amount of Si is high and the amount of N is low, Al is 0.030 mass%
It was also found that the iron loss was significantly reduced in the following ranges.
【００２３】前述したように、Si量の高い高級無方向性
電磁鋼板では、従来鉄損を改善するために、Alを添加し
て固有電気抵抗を増加させる手法が採用されてきた。ま
た、Alの添加は、結晶粒成長を抑制する鋼中析出物であ
るAlＮを凝集粗大化させ、結晶粒の成長を促進させる効
果もあった。そして、これらの効果を得るためには、一
定量以上のAlを確保することが必要とされ、従来、Al量
は少なくとも 0.1mass％を超える範囲に規制され、通常
は 0.4〜1.0 mass％程度含有されていた。しかしなが
ら、発明者らの上記実験によれば、従来技術の範囲より
もはるかにAl量を低減した場合でも、Ｎ量を規制するこ
とによって、Alを含有させた場合と同等以上に良好な集
合組織が発達し鉄損特性が向上することが、新たに見出
されたのである。As described above, in a high-grade non-oriented electrical steel sheet having a high Si content, a method of increasing the specific electric resistance by adding Al has conventionally been adopted in order to improve iron loss. Further, the addition of Al also has the effect of aggregating and coarsening AlN, which is a precipitate in steel that suppresses crystal grain growth, and promoting the growth of crystal grains. In order to obtain these effects, it is necessary to secure a certain amount or more of Al. Conventionally, the amount of Al is restricted to a range exceeding at least 0.1 mass%, and usually contains about 0.4 to 1.0 mass%. It had been. However, according to the above experiments of the inventors, even when the Al content is much reduced than the range of the prior art, by regulating the N content, a texture as good as or better than the case where Al is contained is obtained. It is newly found that iron develops and iron loss characteristics improve.
【００２４】このように、素材成分において、Ｎを低減
した上でAlの含有量を低減することによって、良好な集
合組織が発達する理由については、必ずしも明確に解明
されたわけではないが、発明者らは、不純物の粒界移動
抑制効果に関連づけて以下のように考えている。すなわ
ち、Alを低減することにより、より純鉄に近い結晶格子
の配列状態へと近づくため、粒界構造に依存する本来的
な移動速度差が顕在化して、再結晶に伴う粒成長過程で
一部の粒界のみが優先的に移動し、｛１１１｝、｛５５
４｝、｛３２１｝など数多くの磁気的に不利な結晶粒の
成長が抑制され、｛１００｝強度が増加する方向への集
合組織変化が引き起こされる結果、磁気特性が向上した
ものと考えられる。特に、十分なSi量を含有し、かつＮ
量を0.0030mass％以下に低減した場合には、AlＮ析出物
が形成されにくくなる結果、｛１００｝強度が増加する
方向への粒界移動が促進されるものと考えられる。As described above, although the reason why a good texture is developed by reducing the Al content after reducing the N in the raw material components has not necessarily been clearly elucidated, the inventors of the present invention have found that. Consider the following in connection with the effect of suppressing the migration of impurities to the grain boundaries. In other words, by reducing Al, it approaches a crystal lattice arrangement state closer to that of pure iron, so that an inherent difference in the movement speed depending on the grain boundary structure becomes apparent, and the difference in the grain growth process accompanying recrystallization becomes one. Only the grain boundaries of the parts move preferentially, and {111}, # 55
It is considered that the growth of many magnetically disadvantageous crystal grains such as 4} and {321} is suppressed, and the texture changes in the direction of increasing the {100} strength, resulting in improved magnetic properties. In particular, it contains a sufficient amount of Si and
If the amount is reduced to 0.0030 mass% or less, it is considered that AlN precipitates are less likely to be formed, so that grain boundary movement in the direction of increasing {100} strength is promoted.
【００２５】このように、Alを多量添加することなく集
合組織を改善して磁気特性を向上する手法では、Alが減
量されるために素材のリサイクル性が改善され、また合
金元素の添加量が減少するために飽和磁束密度を高める
ことができる。さらに、合金元素の添加量が減少される
と、鋼板の硬さ上昇が抑制される結果、製品の加工性が
確保されて、汎用電気製品への適用が促進されるとい
う、利点も得られる。As described above, in the method for improving the magnetic properties by improving the texture without adding a large amount of Al, since the amount of Al is reduced, the recyclability of the material is improved, and the addition amount of the alloy element is reduced. The saturation magnetic flux density can be increased to reduce it. Furthermore, when the addition amount of the alloy element is reduced, an increase in the hardness of the steel sheet is suppressed, so that the workability of the product is ensured, and the advantage that application to general-purpose electrical products is promoted is also obtained.
【００２６】次に、発明者らは、上記の集合組織形成お
よび粒成長を促進する効果を有すると共に、さらに、歪
取り焼鈍後の磁気特性を改善することを目的として、微
量元素の影響について詳細な検討を行った。その結果、
鋼中のＮさらにはＣを一層低減することが、上記の効果
を高め、より安定して歪取り焼鈍後の鉄損および磁束密
度の改善が達成されることが突き止められた。Next, the inventors have studied the effects of trace elements for the purpose of improving the magnetic properties after strain relief annealing, while having the effect of promoting the above-described texture formation and grain growth. Study was conducted. as a result,
It has been ascertained that further reduction of N and C in steel enhances the above-mentioned effects, and more stably improves iron loss and magnetic flux density after strain relief annealing.
【００２７】すなわち、Si，AlおよびＮ量を所定の範囲
に規定しただけでは、歪取り焼鈍後の鉄損は、せん断の
ままと同等または若干劣化する傾向にあった。そこで、
この原因を明確にするために、Mnは 0.2mass％の一定と
し、Siを 1.5〜1.8 mass％、Alを0.0004〜0.0100mass
％、ＮおよびＣを約0.0010〜0.0040mass％の範囲でそれ
ぞれ変化させた鋼塊を溶製して実験に供した（一部脱
炭）。そして、これらの鋼塊を、1000℃に加熱してから
熱間圧延により2.8 mm厚としたのち、約1020℃で熱延板
焼鈍を施し、酸洗後、冷間圧延にて最終板厚：0.50mmに
仕上げた。ついで、冷間圧延後、約1000℃，10秒間の再
結晶焼鈍を行って製品板とした。かくして得られた製品
板から、圧延方向と平行および圧延方向と直角に、それ
ぞれサンプルを切り出し、JIS C 2550に準拠して平均の
磁束密度および鉄損を測定した。この測定は、せん断ま
まのものと、窒素雰囲気中にて 750℃, ２ｈの歪取り焼
鈍を施したものについて行った。得られた結果を、図３
に整理して示す。That is, when the amounts of Si, Al, and N are simply set within predetermined ranges, the iron loss after strain relief annealing tends to be equal to or slightly deteriorated as it is when shearing. Therefore,
To clarify the cause, Mn is fixed at 0.2 mass%, Si is 1.5-1.8 mass%, and Al is 0.0004-0.0100 mass%.
%, N and C were varied in the range of about 0.0010 to 0.0040 mass%, respectively, and the steel ingot was melted and subjected to an experiment (partially decarburized). Then, these ingots are heated to 1000 ° C., and then hot-rolled to a thickness of 2.8 mm, then subjected to hot-rolled sheet annealing at about 1020 ° C., pickled, and then cold-rolled to a final thickness: Finished to 0.50mm. Subsequently, after cold rolling, recrystallization annealing was performed at about 1000 ° C. for 10 seconds to obtain a product sheet. From the product sheet thus obtained, samples were cut out in parallel with the rolling direction and at right angles to the rolling direction, and the average magnetic flux density and iron loss were measured in accordance with JIS C 2550. This measurement was carried out on the as-sheared specimen and on the specimen subjected to strain relief annealing at 750 ° C. for 2 hours in a nitrogen atmosphere. FIG. 3 shows the obtained results.
It is arranged and shown.
【００２８】同図に示したように、ＮとＣをそれぞれ、
Ｎ≦0.0020mass％、Ｃ≦0.0020mass％と極力低減した場
合に歪取り焼鈍後の鉄損が安定して回復することが判明
した。この理由は、必ずしも明らかではないが、Ｎは再
結晶焼鈍時に固溶し、冷却時に過飽和状態となり、その
結果、歪取り焼鈍の均熱過程で炭化物の析出が生じるた
めと考えられる。従って、これらの元素を低減すること
によって、上記の害を低減することができ、その結果、
歪取り焼鈍後においても極めて良好な磁気特性が得られ
るものと考えられる。As shown in the figure, N and C are respectively
It was found that the iron loss after the strain relief annealing was stably recovered when the values were reduced as much as possible to N ≦ 0.0020 mass% and C ≦ 0.0020 mass%. Although the reason for this is not necessarily clear, it is considered that N forms a solid solution during recrystallization annealing and becomes supersaturated during cooling, and as a result, carbide precipitates during the soaking process of strain relief annealing. Therefore, by reducing these elements, the above harm can be reduced, and as a result,
It is considered that extremely good magnetic properties can be obtained even after the strain relief annealing.
【００２９】さらに、この発明の無方向性電磁鋼板で
は、需要家での加工性を損なうことのないように、鋼板
のビッカース硬さを 200 HV1以下に規制することが好ま
しい。すなわち、Alを低減し、鋼板表面での酸化を抑制
して金型の早期磨耗を回避することに併せて、鋼板の硬
さを 200 HV1以下に規制することによって、鋼板の加工
性が格段に改善されるのである。とはいえ、鋼板の硬さ
が 120 HV1未満になると、逆に打ち抜いた端面に、だれ
やつぶれ等が発生して金型からの離脱が阻害されたり、
打ち抜き後のかえりが大きくなって鋼板の占積率などに
悪影響を及ぼす場合があるため、120 HV1 以上とするこ
とが好ましい。Further, in the non-oriented electrical steel sheet of the present invention, the Vickers hardness of the steel sheet is preferably regulated to 200 HV1 or less so as not to impair the workability at the consumer. In other words, by reducing Al and suppressing oxidation on the surface of the steel sheet to avoid premature wear of the mold, and by restricting the hardness of the steel sheet to 200 HV1 or less, the workability of the steel sheet is markedly improved. It will be improved. Nevertheless, if the hardness of the steel plate is less than 120 HV1, the end face punched out may be distorted or crushed, preventing removal from the mold,
Since the burr after punching becomes large and may adversely affect the space factor of the steel sheet and the like, it is preferable to set it to 120 HV1 or more.
【００３０】この鋼板硬さの規制は、主にAlを低減する
ことによって達成されるものであるが、不純物元素が多
量に存在したり、最終焼純において焼鈍温度が不十分で
あったり、あるいは焼鈍中に酸化や窒化が生じた場合な
どには、所望の硬さを安定して得るのが困難となること
がある。従って、この発明に従って不純物を低減するこ
とは勿論、製造工程における焼鈍を、過度に酸化や窒化
が生じない雰囲気にすることが有効である。なお、この
発明では、酸化や窒化の核となる鋼中Al量を低減してい
るため、他の鋼種と比較すると、酸化や窒化は生じにく
い、利点がある。The regulation of the hardness of the steel sheet is mainly achieved by reducing the amount of Al. However, if the amount of impurity elements is large, the annealing temperature in the final annealing is insufficient, or When oxidation or nitridation occurs during annealing, it may be difficult to stably obtain a desired hardness. Therefore, it is effective not only to reduce impurities according to the present invention but also to make the annealing in the manufacturing process an atmosphere in which excessive oxidation or nitridation does not occur. In the present invention, since the amount of Al in steel, which is a nucleus of oxidation and nitriding, is reduced, there is an advantage that oxidation and nitriding hardly occur as compared with other steel types.
【００３１】また、酸化や窒化に対する抑制効果のある
Sbを添加することも、鋼板の硬さを200 HV1以下に規制
するのに有効である。また、Sbの添加は、低Alの場合の
AlＮの微細析出を抑制し、かつこれらの粒成長阻害作用
を抑制することにより、磁気特性上より有利な集合組織
の形成を促進させる上でも有効である。これらの効果を
得るには、Sbは 0.005〜0.50mass％の範囲で添加するこ
とが好ましい。Also, it has an effect of suppressing oxidation and nitridation.
The addition of Sb is also effective in regulating the hardness of the steel sheet to 200 HV1 or less. Also, the addition of Sb is
Suppressing the fine precipitation of AlN and suppressing these grain growth inhibiting effects are also effective in promoting the formation of a texture more advantageous in magnetic properties. To obtain these effects, Sb is preferably added in the range of 0.005 to 0.50 mass%.
【００３２】次に、この発明の各構成要件の限定理由に
ついて詳述する。まず、この発明の無方向性電磁鋼板の
成分組成について説明すると、この発明では、Si：1.5
〜4.0 mass％およびMn：0.005 〜2.00mass％を含有させ
る必要がある。 Si：1.5 〜4.0 mass％ すなわち、Siを含有させて電気抵抗を増大させ、鉄損を
低減する必要があり、この鉄損改善のためには1.5 mass
％以上の含有が必要である。一方、Si含有量が4.0 mass
％を超えると、磁束密度が低下するだけでなく、製品の
二次加工性が著しく劣化するので、Si量は 1.5〜4.0 ma
ss％の範囲に限定する。Next, the reasons for limiting the constituent elements of the present invention will be described in detail. First, the component composition of the non-oriented electrical steel sheet of the present invention will be described.
4.04.0 mass% and Mn: 0.005 to 2.00 mass%. Si: 1.5 to 4.0 mass% In other words, it is necessary to increase the electric resistance by containing Si and reduce iron loss.
% Or more is required. On the other hand, the Si content is 4.0 mass
%, Not only does the magnetic flux density decrease, but also the secondary workability of the product deteriorates significantly.
Limited to the range of ss%.
【００３３】Mn：0.005 〜2.00mass％ Mnは、良好な熱間加工性を得るために必要な成分であ
り、そのためには少なくとも 0.005mass％の含有が不可
欠である。一方、2.00mass％を超えると、飽和磁束密度
の低下を招くので、Mn量は 0.005〜2.00mass％の範囲に
限定する。Mn: 0.005 to 2.00 mass% Mn is a component necessary for obtaining good hot workability, and for that purpose, at least 0.005 mass% must be contained. On the other hand, if it exceeds 2.00 mass%, the saturation magnetic flux density will decrease, so the Mn content is limited to the range of 0.005 to 2.00 mass%.
【００３４】Al：0.030 mass％以下 優れた磁気特性を得るためには、鋼板のAl量を0.030 ma
ss％以下まで低減する必要がある。すなわち、Al含有量
が 0.030mass％を超えると、製品板における集合組織が
劣化して磁束密度が低下するため、0.030 mass％以下好
ましくは0.010 mass％以下とする必要がある。Al: 0.030 mass% or less In order to obtain excellent magnetic properties, the amount of Al in the steel sheet is set to 0.030 ma.
It is necessary to reduce it to ss% or less. That is, if the Al content exceeds 0.030 mass%, the texture of the product sheet is deteriorated and the magnetic flux density is reduced. Therefore, the Al content needs to be 0.030 mass% or less, preferably 0.010 mass% or less.
【００３５】Ｃ：0.0020mass％以下、Ｎ：0.0020mass％
以下 前掲図３に示したとおり、低Al鋼において、歪取り焼鈍
後に良好な磁気特性を安定して得るためには、Ｃおよび
Ｎの両者をそれぞれ0.0020mass％以下まで低減すること
が肝要である。なお、Ｃについては、溶鋼段階で0.0020
mass％以下としてもよいし、溶鋼段階で0.0020mass％を
超えている場合には途中工程での脱炭処理により0.0020
mass％以下としてもよく、要は再結晶焼鈍中の鋼板にお
けるＣ含有量を 20ppm以下としておくことが重要であ
る。C: 0.0020 mass% or less, N: 0.0020 mass%
As shown in FIG. 3 above, in order to stably obtain good magnetic properties after strain relief annealing in low Al steel, it is important to reduce both C and N to 0.0020 mass% or less. . C is 0.0020 at the molten steel stage.
mass% or less, and if it exceeds 0.0020 mass% in the molten steel stage, it is 0.0020 mass
It is important to keep the C content in the steel sheet during recrystallization annealing at 20 ppm or less.
【００３６】Sb：0.005 〜0.50mass％ また、Sbは、AlＮ析出形態および粒界移動時の良好な集
合組織形成のために、有効な成分であり、0.005 mass％
未満ではその効果に乏しく、一方0.5 mass％をこえる
と、逆に粒成長性を阻害するため、0.005 〜0.5mass ％
の範囲で添加することが好ましい。Sb: 0.005 to 0.50 mass% Sb is an effective component for AlN precipitation morphology and good texture formation during grain boundary migration.
If it is less than 0.5 mass%, on the other hand, if it exceeds 0.5 mass%, it adversely affects the grain growth.
It is preferable to add in the range of.
【００３７】なお、Ni, Sn, Cu, ＰおよびCrなども、集
合組織の形成に有利に働くことが確認されており、これ
らを添加することに問題はない。しかしながら、Niが
2.0mass％、Snが 1.0mass％、Cuが 1.0mass％、Ｐが 0.
3mass％、そしてCrが 3.0mass％を超えると、粒界移動
が抑制されて集合組織の形成や粒成長性が阻害されるた
め、これらの上限値を超えない範囲で各成分を添加する
ことが好ましい。It has been confirmed that Ni, Sn, Cu, P, Cr and the like also have an advantageous effect on the formation of the texture, and there is no problem in adding these. However, Ni
2.0 mass%, Sn 1.0 mass%, Cu 1.0 mass%, P
If the content of 3 mass% and Cr exceeds 3.0 mass%, the movement of grain boundaries is suppressed, and the formation of a texture and the growth of grains are inhibited. Therefore, it is necessary to add each component within a range not exceeding these upper limits. preferable.
【００３８】上記の成分組成に調整した鋼板は、鉄損Ｗ
15/50 が 3.20 W/kg以下で、かつ磁束密度Ｂ50が（1.65
0 ＋ 0.025×Ｗ15/50 ）Ｔ以上の磁気特性を有し、しか
も加工性およびリサイクル性、さらには歪取り焼鈍後の
磁気特性に優れたものとなる。The steel sheet adjusted to the above-described composition has the iron loss W
15/50 is not more than 3.20 W / kg, and the magnetic flux density B 50 is (1.65
0 + 0.025 × W 15/50 ) T or more, and excellent in workability and recyclability, and also in magnetic properties after strain relief annealing.
【００３９】次に、この発明鋼板の製造方法について説
明する。上記の好適成分組成に調整した溶鋼から、通常
の造塊−分塊法や連続鋳造法によってスラブを製造して
もよいし、100 mm以下の厚さの薄鋳片を直接鋳造法で製
造してもよい。ついで、スラブは通常の方法で加熱して
熱間圧延に供するが、鋳造後、加熱せずに直ちに熱間圧
延に供してもよい。なお、薄鋳片の場合には、熱間圧延
しても良いし、熱間圧延を省略してそのまま以後の工程
に進めてもよい。ついで、必要に応じて熱延板焼鈍を施
し、さらに必要に応じて中間焼鈍を挟む１回以上の冷間
圧延を施したのち、連続焼鈍を行い、必要に応じて絶縁
コーティングを施す。積層した鋼板の鉄損を改善するた
めに、鋼板表面に絶縁コーティングを施すが、この目的
のためには、２種類以上の被膜からなる多層膜であって
もよいし、樹脂等を混合させたコーティングとしてもよ
い。Next, a method for manufacturing the steel sheet of the present invention will be described. From the molten steel adjusted to the above preferred component composition, a slab may be manufactured by a normal ingot-bulking method or a continuous casting method, or a thin slab having a thickness of 100 mm or less is manufactured by a direct casting method. You may. Then, the slab is heated by a usual method and subjected to hot rolling, but may be immediately subjected to hot rolling without heating after casting. In the case of a thin slab, hot rolling may be performed, or hot rolling may be omitted and the process may proceed to the subsequent steps. Subsequently, hot-rolled sheet annealing is performed as necessary, and further, one or more times of cold rolling with intermediate annealing as necessary is performed, then continuous annealing is performed, and an insulating coating is applied as necessary. In order to improve the iron loss of the laminated steel sheet, an insulating coating is applied to the steel sheet surface. For this purpose, a multilayer film composed of two or more kinds of films may be used, or a resin or the like may be mixed. It may be a coating.
【００４０】[0040]
【実施例】表１に示す成分組成になる鋼スラブを、連続
鋳造にて製造した。この鋼スラブを、1180℃で50分間加
熱後、熱間圧延にて2.8 mm厚の熱延板としたのち、1000
℃，１分間の熱延板焼鈍を施し、酸洗後、スケールを除
去してから、180 ℃の温度で冷間圧延を行って、0.50mm
または0.35mmの最終板厚に仕上げた。ついで、(50%H2＋
50%N2)雰囲気で 950℃, 10秒の再結晶焼鈍を施したの
ち、半有機コーティング液を塗布し、 300℃で焼き付け
て製品板とした。EXAMPLE A steel slab having the composition shown in Table 1 was produced by continuous casting. After heating this steel slab at 1180 ° C for 50 minutes, it was hot rolled into a hot rolled sheet having a thickness of 2.8 mm,
After hot-rolled sheet annealing for 1 minute, remove the scale after pickling, cold-roll at 180 ° C to obtain 0.50 mm
Or finished to a final thickness of 0.35mm. Then, (50% H 2 +
After performing recrystallization annealing at 950 ° C. for 10 seconds in a 50% N 2 ) atmosphere, a semi-organic coating solution was applied and baked at 300 ° C. to obtain a product plate.
【００４１】かくして得られた製品板から、圧延方向と
平行および圧延方向と直角に、それぞれサンプルを切り
出し、JIS C 2550に準拠して平均の磁束密度および鉄損
を測定した。この測定は、せん断ままのものと、窒素雰
囲気中にて 750℃, ２ｈの歪取り焼鈍を施したものにつ
いて行った。得られた結果を整理して表２に示す。From the product sheet thus obtained, samples were cut out in parallel with the rolling direction and at right angles to the rolling direction, and the average magnetic flux density and iron loss were measured in accordance with JIS C 2550. This measurement was carried out on the as-sheared specimen and on the specimen subjected to strain relief annealing at 750 ° C. for 2 hours in a nitrogen atmosphere. Table 2 summarizes the obtained results.
【００４２】[0042]
【表１】 [Table 1]
【００４３】[0043]
【表２】 [Table 2]
【００４４】表２に示したとおり、この発明範囲に成分
組成を調整した場合には、せん断ままについてはいうま
でもなく、歪取り焼鈍後においても良好な磁気特性の製
品板が得られている。また、製品板の硬さも適正であ
り、良好な加工性を有していることが分かる。As shown in Table 2, when the component composition was adjusted within the range of the present invention, a product plate having good magnetic properties was obtained after strain relief annealing, not to mention shearing. . In addition, it can be seen that the hardness of the product plate is also appropriate and has good workability.
【００４５】[0045]
【発明の効果】かくして、この発明によれば、加工性お
よびリサイクル性に優れ、しかも歪取り焼鈍後の磁気特
性に優れた高磁束密度無方向性電磁鋼板を安定して得る
ことができる。As described above, according to the present invention, a high magnetic flux density non-oriented electrical steel sheet having excellent workability and recyclability and excellent magnetic properties after strain relief annealing can be stably obtained.
【図１】 モータ効率に及ぼす磁束密度Ｂ50および鉄損
Ｗ15/50 の影響を示す図である。FIG. 1 is a diagram showing the influence of magnetic flux density B 50 and iron loss W 15/50 on motor efficiency.
【図２】 鉄損Ｗ15/50 に及ぼすAl，SiおよびＮ量の影
響を示す図である。FIG. 2 is a graph showing the effect of Al, Si and N amounts on iron loss W 15/50 .
【図３】 磁気特性に及ぼす鋼中のＮおよびＣ量の影響
を示す図である。FIG. 3 is a view showing the influence of the amounts of N and C in steel on magnetic properties.
フロントページの続き (72)発明者 酒井 敬司 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 Ｆターム(参考） 5E041 AA02 AA19 CA02 CA04 HB11 NN01 NN06 NN13 NN15 Continued on the front page (72) Inventor Keiji Sakai 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref.
Claims (3)
さらに 鉄損Ｗ15/50 ≦ 3.20 W/kgかつ磁束密度Ｂ50≧(1.650＋
0.025 ×Ｗ15/50)Ｔ を満足することを特徴とする、加工性、リサイクル性お
よび歪取り焼鈍後の磁気特性に優れた高磁束密度無方向
性電磁鋼板。1. An alloy containing Si: 1.5 to 4.0 mass% and Mn: 0.005 to 2.00 mass%, and Al, C and N, respectively, Al: 0.030 mass% or less, C: 0.0020 mass% or less, N: 0.0020 mass % Or less, and the balance is composed of Fe and unavoidable impurities.
Furthermore, iron loss W 15/50 ≤ 3.20 W / kg and magnetic flux density B 50 ≥ (1.650+
A high magnetic flux density non-oriented electrical steel sheet having excellent workability, recyclability, and magnetic properties after strain relief annealing characterized by satisfying 0.025 × W 15/50 ) T.
イクル性および歪取り焼鈍後の磁気特性に優れた高磁束
密度無方向性電磁鋼板。2. The high magnetic flux density according to claim 1, wherein the composition further contains Sb: 0.005 to 0.50 mass%, and is excellent in workability, recyclability and magnetic properties after strain relief annealing. Grain-oriented electrical steel sheets.
が 200 HV1以下であることを特徴とする、加工性、リサ
イクル性および歪取り焼鈍後の磁気特性に優れた高磁束
密度無方向性電磁鋼板。3. The high magnetic flux density non-directional sheet according to claim 1, wherein the steel sheet has a hardness of 200 HV1 or less, and is excellent in workability, recyclability and magnetic properties after strain relief annealing. Electrical steel sheet.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015025759A1 (en) * | 2013-08-20 | 2015-02-26 | Ｊｆｅスチール株式会社 | Non-oriented magnetic steel sheet having high magnetic flux density, and motor |
| WO2016067568A1 (en) * | 2014-10-30 | 2016-05-06 | Ｊｆｅスチール株式会社 | Non-oriented electromagnetic steel sheet and method for manufacturing non-oriented electromagnetic steel sheet |
| JP2016151050A (en) * | 2015-02-18 | 2016-08-22 | Ｊｆｅスチール株式会社 | Non-oriented silicon steel sheet, method for producing the same and motor core |
| US10006109B2 (en) | 2013-08-20 | 2018-06-26 | Jfe Steel Corporation | Non-oriented electrical steel sheet and hot rolled steel sheet thereof |
| US10102951B2 (en) | 2013-03-13 | 2018-10-16 | Jfe Steel Corporation | Non-oriented electrical steel sheet having excellent magnetic properties |
| US10975451B2 (en) | 2015-08-04 | 2021-04-13 | Jfe Steel Corporation | Method for producing non-oriented electrical steel sheet having excellent magnetic properties |
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| JP6127440B2 (en) | 2012-10-16 | 2017-05-17 | Ｊｆｅスチール株式会社 | Hot rolled steel sheet for manufacturing non-oriented electrical steel sheet and method for manufacturing the same |
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| US10102951B2 (en) | 2013-03-13 | 2018-10-16 | Jfe Steel Corporation | Non-oriented electrical steel sheet having excellent magnetic properties |
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| WO2016067568A1 (en) * | 2014-10-30 | 2016-05-06 | Ｊｆｅスチール株式会社 | Non-oriented electromagnetic steel sheet and method for manufacturing non-oriented electromagnetic steel sheet |
| JPWO2016067568A1 (en) * | 2014-10-30 | 2017-04-27 | Ｊｆｅスチール株式会社 | Non-oriented electrical steel sheet and method for producing non-oriented electrical steel sheet |
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| WO2016132753A1 (en) * | 2015-02-18 | 2016-08-25 | Ｊｆｅスチール株式会社 | Non-oriented electrical steel sheet, production method therefor, and motor core |
| JP2016151050A (en) * | 2015-02-18 | 2016-08-22 | Ｊｆｅスチール株式会社 | Non-oriented silicon steel sheet, method for producing the same and motor core |
| US10941458B2 (en) | 2015-02-18 | 2021-03-09 | Jfe Steel Corporation | Non-oriented electrical steel sheet, production method therefor, and motor core |
| US10975451B2 (en) | 2015-08-04 | 2021-04-13 | Jfe Steel Corporation | Method for producing non-oriented electrical steel sheet having excellent magnetic properties |
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