JP4267563B2 - The rotor iron core material of the rotating machine - Google Patents

The rotor iron core material of the rotating machine Download PDF

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JP4267563B2
JP4267563B2 JP2004357690A JP2004357690A JP4267563B2 JP 4267563 B2 JP4267563 B2 JP 4267563B2 JP 2004357690 A JP2004357690 A JP 2004357690A JP 2004357690 A JP2004357690 A JP 2004357690A JP 4267563 B2 JP4267563 B2 JP 4267563B2
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猛 久保田
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本発明は、回転機のロータ用鉄心素材として用いられる無方向性電磁鋼板、特に、回転時の応力あるいは加減速時の繰り返し応力変動に耐え得る、優れた機械特性と磁気特性を兼ね備えた降伏強度の高い無方向性電磁鋼板に関するものである。 The present invention is non-oriented electrical steel sheet used as the rotor iron core material of the rotating machine, in particular, can withstand repeated stress variations during stress or acceleration and deceleration at the time of rotation, the yield strength that combines excellent mechanical properties and magnetic properties it relates highly non-oriented electrical steel sheet.

近年、電気機器、特に無方向性電磁鋼板がその鉄心材料として使用される回転機、中小型変圧器、電装品等の分野においては、世界的な電力・エネルギー節減、地球環境保全の動きの中で、高効率化、小型化の要請はますます強まりつつある。 Recently, electrical equipment, rotary machine, in particular non-oriented electrical steel sheet is used as a core material, small transformer, in the field of electrical the product for, global power and energy saving, in the movement of the global environment in, high efficiency, miniaturization requirements are becoming stronger increasingly. このような社会環境下において、当然、無方向性電磁鋼板に対してもその性能向上は喫緊の課題である。 In such a social environment, of course, also for non-oriented electrical steel sheet that performance improvement is an urgent issue.

このような動きの中で、最近の目覚しいエレクトロニクス技術の発達と相俟って、回転機分野においては駆動システムの高度化により、さまざまな回転機駆動制御が可能になりつつある。 Among such movement, coupled with the development of recent remarkable electronic technology, in the rotating machine art by sophisticated drive system, is becoming susceptible to various rotary motor drive control. すなわち、駆動電源の周波数制御により、可変速運転、商用周波数以上での高速運転を可能とした回転機が増加し、上記の高効率化、小型化を推進する上での主要技術となりつつある。 That is, the frequency control of the drive power source, variable speed operation, enabling high-speed operation at the commercial frequency or more and the rotating machine is increased, efficiency of the, is becoming a major technique in promoting miniaturization.

ところで、このような高速回転機の実現には、高速回転時の応力に耐え得る構造のロータとする必要がある。 However, the realization of such a high-speed rotating machine, it is necessary to make the rotor of the structure capable of withstanding the stresses during high speed rotation. 一般に、回転機のロータ鉄心に作用する遠心力は回転半径に比例し、かつ回転速度の二乗に比例する。 In general, centrifugal force acting on the rotor iron core of the rotating machine is proportional to the radius of rotation, and is proportional to the square of the rotational speed. このため高速回転機のロータには非常に大きな応力が作用し、ロータ鉄心素材としては高張力であることが要求される。 Thus very large stress acts on the rotor of the high-speed rotating machine, the rotor core materials it is required that a high tension.

一般に回転機のロータ鉄心には、積層した無方向性電磁鋼板が使用される場合が多いが、上記のような高速回転機では所要の機械強度を満足できない場合があり、その際には中実の鋳鋼製のロータが使用されることもあった。 The rotor core generally rotating machine, but in many cases non-oriented electrical steel sheets laminated is used, in a high-speed rotating machine as described above may not be satisfied the required mechanical strength, solid in that case cast steel of the rotor there is also be used. しかし、回転機のロータは磁気現象を活用するものであるから、その鉄心素材としては機械特性と同時に磁気特性に優れていることが必要である。 However, the rotor of the rotating machine since it is intended to take advantage of the magnetic phenomena, it is necessary to be excellent at the same time the magnetic properties and mechanical properties as a core material. すなわち中実鋳鉄製ロータでは、一体物であるために鉄心の渦電流損が非常に大きくなり、電磁鋼板を積層したロータに比べ回転機効率が著しく低下するという問題があった。 In the real cast iron rotor in other words, the eddy current loss of the core in order to be integral body becomes very large, the rotating machine efficiency as compared to a rotor of laminated magnetic steel sheets is lowered significantly. さらに、ロータ鉄心素材の磁束密度が低いと、所要のトルクを発生させるための必要磁束をロータに流すためには励磁アンペアターンを大きくしなければならず、励磁コイルでの銅損の増大に繋がる。 Further, the magnetic flux density of the rotor iron core material is low, in order to flow the required magnetic flux for generating a required torque to the rotor must increase the excitation ampere-turns, leading to increased copper loss in the excitation coil .

このように、高速回転機のロータ鉄心素材としては、機械特性的には高い降伏強度及び引張強度を有し、かつ磁気特性的、特に高速回転に伴い高周波鉄損に優れていることが望ましい。 Thus, as the rotor core material of the high-speed rotating machine, has a high yield strength and tensile strength in the machine characteristic and magnetic characteristic, it is desirable that particularly excellent in high-frequency iron loss with high-speed rotation. 鋼板の機械強度を高める手段として、冷延鋼板の分野では一般に、固溶強化、析出強化、加工強化、細粒化強化、変態組織による強化等の方法が用いられるが、高い機械強度と低い鉄損とは物理的に相反する関係にあり、これらを同時に満足させることは極めて困難であった。 As a means of increasing the mechanical strength of the steel sheet, generally in the field of cold-rolled steel sheet, solid solution strengthening, precipitation strengthening, processing strengthening, grain refinement strengthening, although methods such as strengthening by transformation structure is employed, high mechanical strength and low iron There physically contradictory relationship with loss, has been extremely difficult to satisfy them at the same time.

しかし最近では、高張力を有する無方向性電磁鋼板について幾つかの提案がなされてきている。 Recently, however, some proposals have been made for non-oriented electrical steel sheet having a high tension. 例えば特許文献1のように、Si含有量を3.5〜7.0%と高め、これに固溶強化の大きい元素を添加し抗張力を高める方法が提案されているが、この方法では、Si含有量に依存している割合が高いために、熱延板から最終冷延厚みに圧延するに際して、100〜600℃での温間圧延が必要になる等、製造工程上の課題があった。 For example, as in Patent Document 1, the Si content increased with 3.5 to 7.0%, a method of increasing the added tensile strength greater element of solid solution strengthening is proposed to this, in this method, Si in the proportion that depends on the content is high, when rolling the hot rolled sheet to final cold rolling thickness, etc. are required warm rolling at 100 to 600 ° C., there is a problem in the manufacturing process.
さらに、この技術によって得られる鋼板の磁束密度B50は1.56〜1.61Tと、通常の無方向性電磁鋼板に比較し低いという問題もあった。 Further, the magnetic flux density B50 of the steel sheet obtained by this technique 1.56~1.61T, was also normal problem of low compared to non-oriented electrical steel sheet.

また特許文献2では、Si含有量を2.5〜7.0%と高め、これに固溶強化の大きい元素を添加した溶鋼を急冷凝固法により鋼帯となし、これを温間または冷間圧延し、焼鈍を施して高張力無方向性電磁鋼板を製造する方法が提案されている。 The Patent Document 2, the Si content increased with 2.5 to 7.0%, this steel strip and without the molten steel doped with an element having a large solid-solution strengthening rapid solidification, which between warm or cold rolling, a method of manufacturing a high-strength non-oriented electrical steel sheet subjected to annealing have been proposed. この方法によれば、Si含有量を高めても、急冷凝固法であるため圧延時の脆化問題は緩和されるものの、急冷凝固法という特殊な鋳造法を用いねばならず、工業的に広く用いられている通常の圧延法には適用し難いという問題があった。 According to this method, even if increasing the Si content, although embrittlement problems during rolling is relaxed because it is rapid solidification, without must use a special casting method of rapid solidification, industrially widely the conventional rolling method is used there is a problem that it is difficult to apply.

さらに特許文献3では、Si含有量は2.0〜3.5%とし、NiあるいはNiとMn含有量を高め、通常の冷間圧延を施し、焼鈍条件を制御することにより得られる降伏強度≧60kgf/mm 2 (588.4MPa)級の高張力無方向性電磁鋼板が提案されている。 Furthermore, in Patent Document 3, Si content is set to 2.0% to 3.5%, increasing the Ni or Ni and Mn content, subjected to ordinary cold rolling, the yield strength ≧ obtained by controlling the annealing conditions 60kgf / mm 2 (588.4MPa) class high-strength non-oriented electrical steel sheet has been proposed.
また特許文献4では、Si含有量は2.0〜4.0%とし、NiあるいはNiとMn含有量を高めるとともに、Nb,Zr,Ti,Vの炭窒化物による析出強化を図ることによる降伏強度≧70kgf/mm 2 (686.5MPa)級の高張力無方向性電磁鋼板が提案されている。 The yield by achieving Patent Document 4, Si content is set to 2.0 to 4.0%, to increase the Ni or Ni and Mn content, Nb, Zr, Ti, the precipitation strengthening by carbonitride of V strength ≧ 70kgf / mm 2 (686.5MPa) class high-strength non-oriented electrical steel sheet has been proposed.

しかし、これら特許文献3,4の高張力無方向性電磁鋼板では、磁気特性の劣化を最小限に抑えつつ、通常の無方向性電磁鋼板に比較し高い降伏強度を得ているものの、実際の高速回転において問題となる高周波鉄損の低減は十分ではなく、高速回転機のロータ鉄心として使用した場合に発熱が大きく、回転機効率が大幅に低下するという問題があった。 However, the high-tensile non-oriented electrical steel sheets of Patent Documents 3 and 4, while minimizing the deterioration of the magnetic properties, as compared to conventional non-oriented electrical steel sheet but has gained high yield strength, the actual reduction of the high-frequency iron loss becomes a problem in high-speed rotation is not sufficient, heat generation when used as a rotor core of a high-speed rotating machine is large, there is a problem that the rotating machine efficiency is greatly reduced.
特開昭60−238421号公報 JP-A-60-238421 JP 特開昭61−9520号公報 JP-A-61-9520 JP 特開昭62−256917号公報 JP-A-62-256917 JP 特開平 2−8346号公報 JP 2-8346 JP

上記に鑑み本発明は、機械特性および磁気特性ともに優れた、高い引張強度と低い高周波鉄損を有する無方向性電磁鋼板である回転機のロータ用鉄心素材を提供するものである。 Above view the present invention is to provide the mechanical properties and excellent magnetic properties both high tensile strength and the rotor iron core material for rotating machine is a non-oriented electrical steel sheet having a low high-frequency iron loss.

本発明者らは、無方向性電磁鋼板において、固溶強化、析出強化、加工強化、細粒化強化、変態組織による強化等の方法を用いて、機械特性と同時に磁気特性に優れた鋼板とすることはできないかとの観点から鋭意研究を進めると共に、実際の高速回転機において重要となる高周波鉄損はどのような指標、言い換えればどの周波数の鉄損を低減すれば良いかとの調査、解析を積み重ねてきた。 The present inventors have found that in non-oriented electrical steel sheet, solid solution strengthening, precipitation strengthening, processing strengthening, grain refinement strengthening, using methods such as strengthening by transformation structure, a steel sheet excellent at the same time the magnetic properties and mechanical properties with advances intensive studies in view of whether impossible to high-frequency iron loss what indicator which is important in an actual high-speed rotating machine, survey and do I reduce any frequency iron loss in other words, the analysis It has accumulated.

その結果、通常の無方向性電磁鋼板の製造工程で通板可能な範囲のSi含有量を基本に、Ni,Mn等の元素添加、およびZr炭窒化物を活用し、さらには製品板厚を0.30mm以下とすることにより、900MPa以上の高い引張強度と磁気特性を兼備することが可能であることを見出し、かつ磁気特性としては、1.0Tで1000Hzの高周波鉄損低減が最も重要であることも導き出した。 As a result, the Si content of the strip passing possible range to the basic manufacturing process of the conventional non-oriented electrical steel sheet, Ni, element addition of Mn or the like, and utilizing Zr carbonitride, a further product thickness with 0.30mm or less, found that it is possible to combine high tensile strength and magnetic properties of the above 900 MPa, and as the magnetic properties, the most important high-frequency iron loss reduction of 1000Hz at 1.0T It was also derived that there is.

本発明は上記の知見に基づきなされたものであり、その要旨は次の通りである。 The present invention has been made based on the above findings and has as its gist is as follows.
(1)質量%で、 (1) in mass%,
C :0.05%以下、 N :0.01%以下、 C: 0.05% or less, N: 0.01% or less,
Si:2.8〜4.0%、 Al:3.0%以下、 Si: 2.8~4.0%, Al: 3.0% or less,
P :0.2%以下、 P: 0.2% or less,
および、Ni:0.5〜4.0%、Mn:0.5〜2.0%の少なくとも一種を含有し、 And, Ni: 0.5 to 4.0% Mn: contain at least one 0.5 to 2.0%
かつ、0.1<Zr/8(C+N)<1.0の範囲でZrを含有し、残部Feおよび不可避不純物元素からなり、板厚≦0.30mm とし 、引張強度≧900MPa、高周波鉄損W10/1000≦100w/kg の特性を備えた無方向性電磁鋼板であることを特徴とする回転機のロータ用鉄心素材 And 0.1 <contain Zr in a range of Zr / 8 (C + N) <1.0, the balance being Fe and inevitable impurity elements, and plate thickness ≦ 0.30 mm, tensile strength ≧ 900 MPa, the high-frequency iron loss W10 / 1000 ≦ 100 w / rotor iron core material of the rotating machine, characterized in that kg a non-oriented electrical steel sheet having the properties of.
(2)前記の鋼成分に加え、質量%で、B:0.001〜0.007%を含有することを特徴とする前記(1)記載の回転機のロータ用鉄心素材 (2) addition to the steel ingredients, by mass%, B: 0.001 to 0.007% of the characterized by containing (1) a rotor iron core material of the rotating machine according.

本発明によれば、機械特性および磁気特性ともに優れた、高い引張強度と低い高周波鉄損を有する無方向性電磁鋼板を得ることができ、電気機器、特に無方向性電磁鋼板がその鉄心材料として使用される回転機分野における高効率化、小型化要請に十分に応えることができ、その工業的価値は極めて高いものである。 According to the present invention, it was excellent in both mechanical properties and magnetic properties, it is possible to obtain a non-oriented electrical steel sheet having a high tensile strength and low frequency core loss, electrical equipment, in particular as non-oriented electrical steel sheet whose core materials high efficiency in the rotating machine art to be used, can sufficiently meet the miniaturization demand, its industrial value is extremely high.

以下、本発明を詳細に説明する。 The present invention will be described in detail.
まず、本発明の鋼成分の限定理由について述べる。 First, we describe reasons for limiting the steel composition of the present invention.
Siは、電気抵抗を増大させて渦電流損を低減することにより、高周波鉄損を含め鉄損を低減する作用を有すると同時に、固溶強化により鋼の張力を高める作用を有する成分であり、これらの作用を奏するためには2.8%以上含有させる必要がある。 Si, by reducing the eddy current loss by increasing electrical resistance, at the same time has the effect of reducing iron loss, including the high-frequency iron loss, a component having an action of increasing the tension of the steel by solid solution strengthening, in order to achieve these effects it is necessary to contain more than 2.8%. 一方、その含有量が増えると磁束密度が低下し、また冷延などの作業性の低下や鋼板の脆化、さらにはコスト高をも招くので、4.0%以下とする。 On the other hand, the magnetic flux density decreases if the content is increased, also embrittlement of workability reduction and steel such as cold rolled, and further since also lead to high cost, and 4.0% or less.

Alも、Siと同様に電気抵抗を増大させて渦電流損を減少させることにより、高周波鉄損を含め鉄損を低減する作用のある成分であり、さらに一層の高周波鉄損の低減を図る場合には3.0%以下の範囲で添加する。 Al also, by reducing the Si as well as eddy current loss by increasing electrical resistance, a component having the effect of reducing the iron loss, including the high-frequency iron loss, if further reduced further high-frequency core loss It is added in the range of 3.0% or less in the. その含有量が3.0%を超えると、磁束密度が低下し、冷延などの作業性の低下や鋼板の脆化、さらにはコスト高をも招く。 When the content thereof exceeds 3.0%, the magnetic flux density decreases, the embrittlement of workability reduction and steel such as cold rolled, and further leads also costly.

引張強度≧900MPaを得るためには、さらにNi,Mnの少なくとも一種を含有させる。 To obtain a tensile strength ≧ 900 MPa further Ni, is contained at least one of Mn. この場合Niは、固溶強化により鋼の張力を高める効果を有すると共に、電気抵抗を増大させて渦電流損を低減することにより高周波鉄損も含め鉄損を低減する効果を有し、かつ、飽和磁気モーメントの増大を活用することにより磁束密度の向上に寄与する。 In this case Ni has which has an effect of increasing the tension of the steel by solid solution strengthening, the effect of reducing the iron loss, including high-frequency iron loss by the electrical resistance by increasing reducing eddy current loss, and, It contributes to the improvement of magnetic flux density by utilizing an increase in saturation magnetic moment.
これらの効果を得るためには0.5%以上添加する必要がある。 In order to obtain these effects it is necessary to add 0.5% or more. しかし、その含有量が増えると、逆に飽和磁気モーメントの低下に起因した磁束密度の低下が生じ、かつコスト高ともなるので、4.0%以下とする。 However, when the content increases, contrary to cause reduction of the magnetic flux density due to a decrease in the saturation magnetic moment, and therefore also increases cost, and 4.0% or less.

Mnは、固溶強化および細粒化強化により鋼の張力を高める効果を有すると共に、電気抵抗を増大させて渦電流損を低減することにより、高周波鉄損を含め鉄損を低減する効果を有する。 Mn, along with the effect of increasing the tension of the steel by solid solution strengthening and grain refining, by reducing the eddy current loss by increasing electrical resistance, has the effect of reducing iron loss, including high-frequency core loss . これらの効果を得るためには0.5%以上添加する必要がある。 In order to obtain these effects it is necessary to add 0.5% or more. しかし、その含有量が増えると磁束密度が低下し、またコスト高ともなるので、2.0%以下とする。 However, the magnetic flux density decreases if the content is increased, and because it becomes costly, and 2.0% or less.

Pは、鋼の張力を高める効果が非常に大きい元素であるが、結晶粒界に偏析することから鋼の脆化をもたらす場合もある。 P is the effect of increasing the tension of the steel is very large elements, sometimes resulting in embrittlement of steel because it segregates to the grain boundaries. この粒界偏析による脆化を避けて、通常の無方向性電磁鋼板の製造工程での通板を可能にすると共に、鋼板の脆化を避けるために0.2%以下の範囲で添加する。 This to avoid embrittlement due to grain boundary segregation, thereby enabling the sheet passing in the manufacturing process of the conventional non-oriented electrical steel sheet, it is added in a range of 0.2% or less in order to avoid embrittlement of the steel sheet.

Zrは微細に析出した炭窒化物を形成し、析出強化および細粒化強化により鋼の張力を高める効果を有する。 Zr has an effect of increasing the tension of the steel by forming a carbonitride which finely precipitates, precipitation strengthening and grain refining strengthening. 無方向性電磁鋼板において炭窒化物を形成する元素には、Zrの他にもTi,V,Nb,Mo等、種々の元素があるが、特に本発明のZrの場合には、炭窒化物による析出強化効果が大きいと同時にそれに伴う磁化特性劣化が少ない。 The element which forms carbonitrides in non-oriented electrical steel sheet, in addition to Ti and Zr, V, Nb, Mo and the like, there are various elements, especially in the case of Zr of the present invention, carbonitride magnetic characteristic deterioration accompanying the same time is large precipitation strengthening effect is small. これは、Zr炭窒化物の析出形態が、無方向性電磁鋼板における析出強化には功を奏す一方、磁壁移動等を通じての磁化過程には影響を及ぼし難いためと推察される。 This precipitation forms of Zr carbonitride, the precipitation strengthening in the non-oriented electrical steel sheet while Sosu Gong, the magnetization process through magnetic domain wall movement, etc. is presumably because hardly affected.
この効果を得るためには、Zr/8(C+N)が0.1超である必要があり、またその含有量が増えても再結晶温度の上昇、さらには鋼板の脆化も招くので、Zr/8(C+N)で1.0未満とする。 To obtain this effect, it is necessary Zr / 8 (C + N) is greater than 0.1, also rises the recrystallization temperature is increasing its content, because more leads also embrittlement of the steel sheet, Zr / in 8 (C + N) is less than 1.0. この場合、炭窒化物形成のためのCとNはそれぞれ、0.05%以下、0.01%以下とする必要がある。 In this case, each C and N for forming carbonitrides, 0.05% or less, is required to be 0.01% or less. Cが0.05%を、Nが0.01%を超えて含有された場合には、磁気時効等により鉄損特性が著しく劣化する。 C is 0.05%, when N is contained in excess of 0.01%, the iron loss characteristics are significantly deteriorated by magnetic aging or the like.

上述の成分以外は、Feおよび不可避不純物元素であるが、高張力化に伴う結晶粒界の脆化を回避する目的で、必要に応じてBを添加してもよい。 Except above-mentioned components, but is Fe and inevitable impurity elements, in order to avoid embrittlement of the grain boundaries due to the high tension of, may be added to B as needed. この場合、Bは0.001%以上添加する必要がある。 In this case, B has to be added over 0.001%. 一方その含有量が増えても、磁束密度の低下や、通常の無方向性電磁鋼板の製造工程における熱間圧延時の脆化等をもたらすので、0.007%以下とする。 Meanwhile even increasing its content, decrease in magnetic flux density, because it provides the embrittlement or the like during hot rolling in the usual manufacturing process of the non-oriented electrical steel sheet to 0.007% or less.

前記成分からなる無方向性電磁鋼板の引張強度は900MPa以上とすることができる。 The tensile strength of the non-oriented electrical steel sheet comprising the components may be at least 900 MPa. 引張強度が900MPa未満では、高速回転機のロータ鉄心素材として使用された場合に、十分な高速回転を実現し、回転機の高効率化、小型化を満足することができない。 Tensile strength is less than 900 MPa, when it is used as a rotor core material for high speed rotating machines, to achieve satisfactory high-speed rotation, high efficiency of the rotating machine, it is impossible to satisfy the miniaturization.
また、引張強度が900MPa以上であっても、高速回転機のロータ鉄心として使用した場合に、高周波鉄損鋼板により発熱し回転機効率が低下したのでは技術的価値がない。 Also, the tensile strength is not more than 900 MPa, when used as a rotor core of a high-speed rotating machine, than rotating machine efficiency heating by high-frequency iron loss steel sheet is lowered no technical value.

そこで、C:0.037%、Si:3.26%、Al:0.74%、Ni:2.15%、P:0.02%、N:0.002%、Zr:0.051%を含有する鋼(Zr/8(C+N):0.16)を熱間圧延後、表1に示した板厚まで冷間圧延した後、800℃で20秒間の連続仕上焼鈍を施した。 Accordingly, C: 0.037%, Si: 3.26%, Al: 0.74%, Ni: 2.15%, P: 0.02%, N: 0.002%, Zr: 0.051% containing steel (Zr / 8 (C + N): 0.16) and after hot rolling, after cold rolled to a plate thickness shown in Table 1, were subjected to continuous finish annealing of 20 seconds at 800 ° C.. その後、エプスタイン試料および引張試験片を切り出し、磁気特性および機械特性を測定した。 Then, cut the Epstein samples and tensile test pieces were measured magnetic and mechanical properties.

表1に示すように、No. As shown in Table 1, No. Bは、引張強度は900MPa以上と高張力であるものの、板厚が0.30mm超と厚いため、高周波鉄損W10/1000は100w/kg超となっている。 B is the tensile strength although it may be at least as high tensile 900 MPa, because the plate thickness is thick and 0.30mm greater, the high-frequency iron loss W10 / 1000 has a 100 w / kg greater. 高周波鉄損が100w/kgを超えた場合には、高速回転機のロータ鉄心として使用した場合に発熱が大きくなり、電気エネルギーから機械エネルギーへの変換ロスの増大が生じ、回転機効率の低下をもたらすと共に、回転機自体の温度も上昇し、回転機性能の安定性にも影響をおよぼすため、鋼板の板厚は0.30mm以下とした。 When the high-frequency iron loss exceeded 100 w / kg is exothermic when used as a rotor core of a high-speed rotating machine becomes large, the increase in conversion loss of the mechanical energy is generated from electrical energy, a reduction of the rotating machine efficiency together bring the temperature of the rotating machine itself increases and on the influence on the stability of the rotating machine performance, the thickness of the steel sheet is set to not more than 0.30 mm.

次に本発明の実施例を示す。 The following Examples of the present invention.
表2に示した成分の鋼を熱間圧延後、0.20mm厚みに冷間圧延した後、770℃で20秒間、連続仕上焼鈍を施し、その後、エプスタイン試料に切断し磁気特性を測定すると共に、引張試験片に加工し機械特性を測定した。 After components of the steel to hot rolling shown in Table 2, it was cold rolled to 0.20mm thick, 20 seconds at 770 ° C., subjected to continuous finish annealing, thereafter, with measuring the magnetic properties were cut into Epstein sample , mechanical properties were measured and processed into tensile bars.
表3に示すように、No. As shown in Table 3, No. 1は、高周波鉄損W10/1000は100w/kg以下と良好であるものの、Zr炭窒化物を活用していないため、引張強度が900MPa未満となっている。 1, although the high-frequency iron loss W10 / 1000 is good and less 100 w / kg, because it does not take advantage of Zr carbonitride, a tensile strength becomes less than 900 MPa. No. No. 2は、Zrを添加してはいるものの、0.1<Zr/8(C+N)<1.0の範囲に制御していないため、やはり引張強度が900MPa未満となっている。 2, although with the addition of Zr, 0.1 <since Zr / 8 (C + N) <not controlled in the range of 1.0, also the tensile strength becomes less than 900 MPa. 表3から明らかなように、本発明によれば、機械特性および磁気特性ともに優れた、高い降伏強度と低い高周波鉄損を有する無方向性電磁鋼板の提供が可能であることがわかる。 Table 3 As is apparent, according to the present invention, was excellent in both mechanical properties and magnetic properties, it can be seen that it is possible to provide a non-oriented electrical steel sheet having a high yield strength and low frequency core loss.

Claims (2)

  1. 質量%で、 In mass%,
    C :0.05%以下、 N :0.01%以下、 C: 0.05% or less, N: 0.01% or less,
    Si:2.8〜4.0%、 Al:3.0%以下、 Si: 2.8~4.0%, Al: 3.0% or less,
    P :0.2%以下、 P: 0.2% or less,
    更にNiとMnを、Ni:0.5〜4.0%、Mn:0.5〜2.0%の少なくとも一種を含有し、 More Ni and Mn, Ni: 0.5 to 4.0% Mn: it contains at least one 0.5 to 2.0%
    かつ、0.1<Zr/8(C+N)<1.0の範囲でZrを含有し、残部Feおよび不可避不純物元素からなり、板厚≦0.30mm とし 、引張強度≧900MPa、高周波鉄損W10/1000≦100w/kg の特性を備えた無方向性電磁鋼板であることを特徴とする回転機のロータ用鉄心素材 And 0.1 <contain Zr in a range of Zr / 8 (C + N) <1.0, the balance being Fe and inevitable impurity elements, and plate thickness ≦ 0.30 mm, tensile strength ≧ 900 MPa, the high-frequency iron loss W10 / 1000 ≦ 100 w / rotor iron core material of the rotating machine, characterized in that kg a non-oriented electrical steel sheet having the properties of.
  2. 質量%でさらに、B:0.001〜0.007%を含有することを特徴とする請求項1に記載の回転機のロータ用鉄心素材 Furthermore by mass%, B: rotor iron core material of the rotating machine according to claim 1, characterized in that it contains 0.001 to 0.007 percent.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326642B1 (en) 1992-05-29 2001-12-04 Semiconductor Energy Laboratory Co., Ltd. Electric device, matrix device, electro-optical display device, and semiconductor memory having thin-film transistors
US6441399B1 (en) 1994-04-22 2002-08-27 Semiconductor Energy Laboratory Co., Ltd. Semiconductor integrated system
US6747627B1 (en) 1994-04-22 2004-06-08 Semiconductor Energy Laboratory Co., Ltd. Redundancy shift register circuit for driver circuit in active matrix type liquid crystal display device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2474636B9 (en) * 2009-09-03 2019-05-08 Nippon Steel & Sumitomo Metal Corporation Non-oriented electrical steel sheet

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326642B1 (en) 1992-05-29 2001-12-04 Semiconductor Energy Laboratory Co., Ltd. Electric device, matrix device, electro-optical display device, and semiconductor memory having thin-film transistors
US6441399B1 (en) 1994-04-22 2002-08-27 Semiconductor Energy Laboratory Co., Ltd. Semiconductor integrated system
US6599791B1 (en) 1994-04-22 2003-07-29 Semiconductor Energy Laboratory Co., Ltd. Semiconductor integrated circuit
US6747627B1 (en) 1994-04-22 2004-06-08 Semiconductor Energy Laboratory Co., Ltd. Redundancy shift register circuit for driver circuit in active matrix type liquid crystal display device

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