JP5417689B2 - Non-oriented electrical steel sheet - Google Patents
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本発明は、無方向性電磁鋼板に関し、特に、ハイブリッド電気自動車等に用いて好適な高周波鉄損特性に優れる無方向性電磁鋼板に関するものである。 The present invention relates to a non-oriented electrical steel sheet, and more particularly to a non-oriented electrical steel sheet having excellent high-frequency iron loss characteristics suitable for use in a hybrid electric vehicle or the like.
ハイブリッド電気自動車用モータは、小型化、高効率化の観点から、400Hz〜2kHzの高周波域で駆動するよう設計されている。したがって、このようなモータのコア材に用いられる無方向性電磁鋼板は、高周波鉄損が低いことが望ましい。高周波鉄損を低減するためには、板厚の低減と固有抵抗を高めることが有効である。 The hybrid electric vehicle motor is designed to be driven in a high frequency range of 400 Hz to 2 kHz from the viewpoint of miniaturization and high efficiency. Therefore, it is desirable that the non-oriented electrical steel sheet used for the core material of such a motor has a low high-frequency iron loss. In order to reduce high-frequency iron loss, it is effective to reduce the plate thickness and increase the specific resistance.
このうち、板厚を低減することは、剛性の低下を招いて材料の取り扱いを難しくするばかりでなく、モータコア製造における打ち抜き工数や積み工数を増加させるという問題がある。一方、固有抵抗を高めるには、Siの添加が効果的であり、板厚の低減を招かないため、高周波鉄損を低減する上では好ましい。しかし、Siは固溶強化能の大きい元素であるため、Si添加にともなって材料が硬化し、圧延性や加工性が低下するという問題がある。 Of these, reducing the plate thickness not only causes a decrease in rigidity and makes it difficult to handle materials, but also increases the number of stamping steps and stacking steps in motor core manufacturing. On the other hand, in order to increase the specific resistance, addition of Si is effective and does not cause a reduction in the plate thickness, which is preferable in reducing the high-frequency iron loss. However, since Si is an element having a large solid solution strengthening ability, there is a problem that the material is hardened with the addition of Si and the rollability and workability are lowered.
このような問題点を解決する手段として、Siの代わりにMnを添加する技術がある。Mnは、Siに比べて固溶強化能が小さいため、製造性の劣化を抑制しつつ高周波鉄損の改善が可能となる。このようなMnの効果を活用した技術としては、例えば、特許文献1には、C:0.005mass%以下、Si:0.5〜2.5mass%、Mn:1.0〜3.5mass%、Al:1.0〜3.0mass%を含有する無方向性電磁鋼板が開示されている。また、特許文献2には、C:0.01mass%以下、Si:3.0mass%以下、Mn:1.0〜4.0mass%、Al:1.0〜3.0mass%を含有する無方向性電磁鋼板が開示されている。
しかしながら、上記特許文献1および2の技術は、いずれもMn添加量が増加するのに伴ってヒステリシス損が増大し、所期した鉄損の低下が得られない場合があり、Mn添加による鉄損低減効果を安定して得ることできないという問題を有するものであった。
However, the techniques of
そこで、本発明の目的は、Mn添加による高周波鉄損低減効果を安定して実現することができる無方向性電磁鋼板を提供することにある。 Then, the objective of this invention is providing the non-oriented electrical steel plate which can implement | achieve the high frequency iron loss reduction effect by Mn addition stably.
発明者らは、従来のMn添加無方向性電磁鋼板が抱える問題点、即ち、Mn添加によりヒステリシス損が増大するという問題点を解決するために、その原因を探るべく鋭意検討を重ねた。その結果、Mn原料として使用されているフェロマンガン等から不可避的に混入してくるSeがMnと析出物を生成し、このSe析出物の存在によりMnの鉄損低減効果が妨げられていること、従って、Mnの鉄損低減効果を効果的に発現させるためには、不可避的不純物として混入してくるSeの低減が有効であることを見出し、本発明を完成させた。 In order to solve the problem of the conventional Mn-added non-oriented electrical steel sheet, that is, the problem that hysteresis loss increases due to the addition of Mn, the inventors have conducted intensive studies to find out the cause. As a result, Se inevitably mixed from ferromanganese used as a Mn raw material generates Mn and precipitates, and the presence of this Se precipitates hinders the Mn iron loss reduction effect. Therefore, in order to effectively exhibit the effect of reducing the iron loss of Mn, it has been found that the reduction of Se mixed as an inevitable impurity is effective, and the present invention has been completed.
すなわち、本発明は、C:0.005mass%以下、Si:1.5〜4mass%、Mn:1〜5mass%、P:0.1mass%以下、S:0.005mass%以下、Al:3mass%以下、N:0.005mass%以下を含有し、さらに、Se:0.0020mass%以下、Ca:0.0005〜0.007mass%を含有し、残部がFeおよび不可避的不純物からなる無方向性電磁鋼板である。 That is , the present invention is C: 0.005 mass% or less, Si: 1.5-4 mass%, Mn: 1-5 mass%, P: 0.1 mass% or less, S: 0.005 mass% or less, Al: 3 mass% In the following, N: 0.005 mass% or less, Se: 0.0020 mass% or less, Ca: 0.0005 to 0.007 mass%, the balance being Fe and unavoidable impurities It is a steel plate.
また、本発明は、C:0.005mass%以下、Si:1.5〜4mass%、Mn:1〜5mass%、P:0.1mass%以下、S:0.005mass%以下、Al:3mass%以下、N:0.005mass%以下を含有し、さらに、Se:0.0020mass%以下、Mg:0.0003〜0.005mass%を含有し、残部がFeおよび不可避的不純物からなる無方向性電磁鋼板である。 In the present invention, C: 0.005 mass% or less, Si: 1.5 to 4 mass%, Mn: 1 to 5 mass%, P: 0.1 mass% or less, S: 0.005 mass% or less, Al: 3 mass% Hereinafter, N: 0.005 mass% or less, Se: 0.0020 mass% or less, Mg: 0.0003 to 0.005 mass%, the balance being Fe and unavoidable impurities It is a steel plate.
また、本発明の無方向性電磁鋼板は、上記成分組成に加えてさらに、Sb:0.0005〜0.05mass%およびSn:0.0005〜0.05mass%のうちから選ばれる1種または2種を含有することを特徴とする。 Further, the non-oriented electrical steel sheet of the present invention may be one or two selected from Sb: 0.0005 to 0.05 mass% and Sn: 0.0005 to 0.05 mass% in addition to the above component composition. It contains seeds.
また、本発明の無方向性電磁鋼板は、Ti:0.002mass%以下であることを特徴とする。 The non-oriented electrical steel sheet of the present invention is characterized by being Ti: 0.002 mass% or less.
本発明によれば、Mn添加無方向性電磁鋼板の高周波鉄損を安定して低減することができるので、製品品質の向上や歩留まりの向上に寄与する。さらに、本発明の無方向性電磁鋼板は、高周波鉄損特性に優れるので、ハイブリッド電気自動車用や工作機械用のモータのコア材として好適に用いることができる。 According to the present invention, the high-frequency iron loss of the Mn-added non-oriented electrical steel sheet can be stably reduced, which contributes to the improvement of product quality and the yield. Furthermore, since the non-oriented electrical steel sheet of the present invention is excellent in high-frequency iron loss characteristics, it can be suitably used as a core material for motors for hybrid electric vehicles and machine tools.
本発明を開発する契機となった実験について説明する。
発明者らは、磁気特性に及ぼすMnの影響を調査するため、C:0.0015mass%、Si:2.9mass%、Al:1.2mass%、P:0.01mass%、S:0.0007mass%、N:0.0021mass%を含有し、Mnを0.1〜3.5mass%の範囲で変化させた鋼を実験室にて溶解し、熱間圧延して熱延板としたのち100vol%N2雰囲気中で1000℃×30秒の熱延板焼鈍を施した。次いで、上記熱延板を冷間圧延して板厚0.30mmの冷延板としたのち20vol%H2−80vol%N2雰囲気中で950℃×30秒の仕上焼鈍を行い無方向性電磁鋼板とした。
An experiment that triggered the development of the present invention will be described.
In order to investigate the influence of Mn on the magnetic properties, the inventors investigated C: 0.0015 mass%, Si: 2.9 mass%, Al: 1.2 mass%, P: 0.01 mass%, S: 0.0007 mass. %, N: 0.0021 mass%, Mn was changed in the range of 0.1 to 3.5 mass%, melted in the laboratory, hot rolled into a hot-rolled sheet, and then 100 vol% Hot-rolled sheet annealing at 1000 ° C. for 30 seconds was performed in an N 2 atmosphere. Next, the hot-rolled sheet was cold-rolled to form a cold-rolled sheet having a thickness of 0.30 mm, and then subjected to finish annealing at 950 ° C. for 30 seconds in an atmosphere of 20 vol% H 2 -80 vol% N 2 , and non-directional electromagnetic A steel plate was used.
次いで、上記のようにして得た無方向性電磁鋼板から、幅30mm×長さ280mmのエプスタイン試験片を圧延方向および圧延直角方向より切り出し、JIS C2550に準拠して、最大磁束密度1.0T、周波数400Hzにおける鉄損W10/400を測定した。図1の●印は、上記測定の結果を、Mn含有量とW10/400との関係で示したものである。この結果から、Mnが1mass%未満ではMn含有量の増加に伴い鉄損が低下しているが、1mass%以上では、鉄損の低下が緩やかとなり、2%以上の高Mn域ではむしろ鉄損が増加する傾向があることが明らかとなった。 Next, from the non-oriented electrical steel sheet obtained as described above, an Epstein test piece having a width of 30 mm × a length of 280 mm was cut out from the rolling direction and the direction perpendicular to the rolling direction, and in accordance with JIS C2550, a maximum magnetic flux density of 1.0 T, The iron loss W 10/400 at a frequency of 400 Hz was measured. The circles in FIG. 1 show the results of the above measurement in terms of the relationship between the Mn content and W 10/400 . From this result, when Mn is less than 1 mass%, the iron loss decreases with an increase in the Mn content, but when it is 1 mass% or more, the decrease in iron loss is moderate, and in the high Mn region of 2% or more, the iron loss is rather low. It became clear that there was a tendency to increase.
この原因を調査するため、2mass%Mn添加鋼についてTEMで鋼中の析出物を観察したところ、Mnのセレン化物が粒界に析出しているのが認められた。また、鋼中のSe含有量を定量分析したところ、11〜15massppmであることがわかった。 In order to investigate this cause, when the precipitate in steel was observed with TEM about 2 mass% Mn addition steel, it was recognized that the selenide of Mn has precipitated in the grain boundary. Moreover, when Se content in steel was quantitatively analyzed, it was found to be 11 to 15 mass ppm.
そこで、磁気特性に及ぼすSeの影響を明らかにするために、C:0.0016mass%、Si:2.8mass%、Al:1.3mass%、P:0.01mass%、S:0.0007mass%、N:0.0021mass%を含有し、高純度のMn原料を用いて、Mnの含有量を0.1〜3.5mass%の範囲で変化させた鋼を実験室にて溶解し、上記実験と同じ条件で無方向性電磁鋼板とした。なお、上記鋼中のSe含有量は、いずれも5massppm以下であった。 Therefore, in order to clarify the influence of Se on the magnetic properties, C: 0.0016 mass%, Si: 2.8 mass%, Al: 1.3 mass%, P: 0.01 mass%, S: 0.0007 mass% , N: containing 0.0021 mass%, using a high-purity Mn raw material, steel in which the Mn content was changed in the range of 0.1 to 3.5 mass% was melted in the laboratory, and the above experiment was performed. It was set as the non-oriented electrical steel sheet on the same conditions. In addition, all Se content in the said steel was 5 massppm or less.
上記のようにして得た無方向性電磁鋼板について、上記実験と同様の条件で高周波鉄損W10/400を測定し、その結果を図1中に○印で示した。この結果から、Seを5massppm以下に低減した場合には、Mnが1mass%未満では、Mnの鉄損低減効果に及ぼす影響は小さいが、Mn添加量が高まるほど鉄損が低下し、Se低減の効果が現れてくることがわかる。この原因は、現時点では明らかではないが、Mnのセレン化物の生成量はSeの量に依存するため、Seを低減するほど、Mnのセレン化物の量は少なくなり、粒成長しやすくなること、さらに、高Mn鋼では、Mnのsolute dragにより、粒成長の駆動力が低下しているため、Seの析出物の微量な変化(低減)であっても、粒成長性が相乗的に影響を受けやすくなり、そのため、Mn含有量が大きいほど、Se低減の効果が現れたものと考えられる。なお、Mnのセレン化合物としては、MnSeが考えられる。 With respect to the non-oriented electrical steel sheet obtained as described above, the high-frequency iron loss W 10/400 was measured under the same conditions as in the above experiment, and the results are indicated by ◯ in FIG. From this result, when Se is reduced to 5 mass ppm or less, if Mn is less than 1 mass%, the effect of Mn on the iron loss reduction effect is small, but the iron loss decreases as the amount of Mn added increases, and Se reduction is reduced. It turns out that the effect appears. The cause of this is not clear at this time, but the amount of Mn selenide produced depends on the amount of Se. Therefore, the lower the Se, the smaller the amount of Mn selenide and the easier the grain growth. Furthermore, in high Mn steel, the driving force of grain growth is reduced due to the Mn solution drag, so even if there is a slight change (reduction) in the precipitate of Se, the grain growth property has a synergistic effect. It is considered that the effect of Se reduction appears as the Mn content increases. In addition, MnSe is considered as a selenium compound of Mn.
次に、鉄損に及ぼすSeの影響を確認するため、C:0.0020mass%、Si:3.10mass%、Mn:2.0mass%、Al:1.2mass%、P:0.01mass%、S:0.0004mass%、N:0.0018mass%を含有し、Seの含有量をtr.〜50massppmの範囲で変化させた鋼を実験室にて溶解し、上記実験と同一の条件で無方向性電磁鋼板とし、高周波鉄損W10/400を測定した。 Next, in order to confirm the influence of Se on iron loss, C: 0.0020 mass%, Si: 3.10 mass%, Mn: 2.0 mass%, Al: 1.2 mass%, P: 0.01 mass%, S: 0.0004 mass%, N: 0.0018 mass%, and the content of Se is tr. Steel changed in a range of ˜50 mass ppm was melted in a laboratory, and a non-oriented electrical steel sheet was obtained under the same conditions as in the above experiment, and high-frequency iron loss W 10/400 was measured.
その結果を、図2に、Se含有量と鉄損との関係として示した。図2より、Se含有量を10massppm以下とすることで、鉄損が大きく低下することがわかる。これはSe低減によりMnのセレン化物量が低下し、粒成長性が向上したためと考えられる。よって、本発明では、Seの含有量を10massppm以下とする。好ましくは、5massppm以下である。 The results are shown in FIG. 2 as the relationship between Se content and iron loss. From FIG. 2, it can be seen that the iron loss is greatly reduced when the Se content is 10 mass ppm or less. This is presumably because the selenide content of Mn decreased due to Se reduction, and the grain growth property improved. Therefore, in this invention, content of Se shall be 10 massppm or less. Preferably, it is 5 massppm or less.
次に、Se以外の成分の組成範囲を限定する理由について説明する。
C:0.005mass%以下
Cは、0.005mass%超であると、Mn系の炭化物を生じて鉄損が増加するため、上限を0.005mass%とする。好ましくは0.002mass%以下である。
Next, the reason for limiting the composition range of components other than Se will be described.
C: 0.005 mass% or less Since C is more than 0.005 mass%, Mn-based carbides are generated and the iron loss is increased, so the upper limit is made 0.005 mass%. Preferably it is 0.002 mass% or less.
Si:1.5〜4mass%
Siは、鋼板の固有抵抗を高めるのに有効な元素であるため1.5mass%以上添加する。しかし、4mass%を超えると、鉄損は低下するものの、飽和磁束密度の低下に伴い磁束密度が低下する。よって、Siは1.5〜4mass%の範囲とする。
Si: 1.5-4 mass%
Since Si is an element effective for increasing the specific resistance of the steel sheet, it is added in an amount of 1.5 mass% or more. However, if it exceeds 4 mass%, the iron loss is reduced, but the magnetic flux density is reduced as the saturation magnetic flux density is reduced. Therefore, Si is set to a range of 1.5 to 4 mass%.
Mn:1〜5mass%
Mnは、鋼板の固有抵抗を上げるのに有効な元素であるため、下限を1mass%とする。一方、5mass%超えでは、磁束密度が低下するので、上限は5mass%とする。なお、鉄損をさらに低減するためには、Mnは1.5mass%以上とするのがより好ましい。
Mn: 1 to 5 mass%
Since Mn is an element effective for increasing the specific resistance of the steel sheet, the lower limit is set to 1 mass%. On the other hand, if it exceeds 5 mass%, the magnetic flux density decreases, so the upper limit is set to 5 mass%. In order to further reduce the iron loss, it is more preferable that Mn is 1.5 mass% or more.
P:0.1mass%以下
Pは、0.1mass%を超えて添加すると、鋼板が硬くなり、圧延が難しくなるため、上限を0.1mass%とする。
P: 0.1 mass% or less When P is added in excess of 0.1 mass%, the steel sheet becomes hard and rolling becomes difficult. Therefore, the upper limit is made 0.1 mass%.
S:0.005mass%以下
Sは、含有量が0.005mass%を超えると、MnSの析出により鉄損が増大するため、上限を0.005mass%とする。好ましくは、0.001mass%以下である。
S: 0.005 mass% or less If the content of S exceeds 0.005 mass%, iron loss increases due to precipitation of MnS, so the upper limit is made 0.005 mass%. Preferably, it is 0.001 mass% or less.
Al:3mass%以下
Alは、Siと同様、固有抵抗を高めるのに有効な元素である。しかし、3mass%を超えると、鉄損は低下するものの、飽和磁束密度の低下に伴い磁束密度が低下するため、上限を3mass%とする。
Al: 3 mass% or less Al, like Si, is an element effective for increasing the specific resistance. However, if it exceeds 3 mass%, the iron loss decreases, but the magnetic flux density decreases as the saturation magnetic flux density decreases, so the upper limit is set to 3 mass%.
N:0.005mass%以下
Nは、含有量が多いと、Alと結合してAlNの析出量が多くなり、鉄損を増大させる原因となる。よって、Nは0.005mass%以下とする。
N: 0.005 mass% or less When the content of N is large, it is combined with Al to increase the precipitation amount of AlN, which causes an increase in iron loss. Therefore, N is set to 0.005 mass% or less.
本発明の無方向性電磁鋼板は、上記必須とする成分以外に、CaおよびMgを、下記の範囲で添加することができる。
Ca:0.0005〜0.007mass%
Caは、析出したセレン化物と複合し、析出物を粗大化するため、鉄損を低減する効果がある。上記効果を得るためには、0.0005mass%以上添加するのが好ましい。一方、0.007mass%を超えると、CaSおよびセレン化物の析出量が多くなり過ぎ、却って鉄損が増加するため、上限は0.007mass%とする。なお、Caを添加する場合には、SeはCaと複合析出するため、Seの含有量を20massppmまで許容することができる。ただし、この場合でも、10massppm以下であることが好ましく、より好ましくは5massppm以下である。
The non-oriented electrical steel sheet of the present invention can contain Ca and Mg in the following ranges in addition to the essential components.
Ca: 0.0005 to 0.007 mass%
Ca is combined with the precipitated selenide and coarsens the precipitate, and therefore has an effect of reducing iron loss. In order to acquire the said effect, adding 0.0005 mass% or more is preferable. On the other hand, if it exceeds 0.007 mass%, the precipitation amount of CaS and selenide increases excessively, and the iron loss increases on the contrary, so the upper limit is made 0.007 mass%. In addition, when adding Ca, since Se precipitates together with Ca, the content of Se can be allowed up to 20 massppm. However, even in this case, it is preferably 10 massppm or less, more preferably 5 massppm or less.
Mg:0.0003〜0.005mass%
Mgは、鋼中で酸化物を形成し、この酸化物にSeが複合析出して粗大化するため、鉄損を低減する効果がある。上記効果を得るためには、0.0003mass%以上添加するのが好ましく、0.0005mass%以上の添加がより好ましい。一方、0.005mass%を超えて添加することは困難であり、いたずらにコストアップを招くだけであるため、上限は0.005mass%とする。なお、Mgを添加する場合には、SeはMgと複合析出するため、Seの含有量を20massppmまで許容することができる。ただし、この場合でも、10massppm以下であることが好ましく、より好ましくは5massppm以下である。
Mg: 0.0003 to 0.005 mass%
Mg forms an oxide in the steel, Se segregates in the oxide and coarsens, so it has the effect of reducing iron loss. In order to acquire the said effect, adding 0.0003 mass% or more is preferable, and addition of 0.0005 mass% or more is more preferable. On the other hand, it is difficult to add more than 0.005 mass%, and the cost is unnecessarily increased, so the upper limit is set to 0.005 mass%. In addition, when adding Mg, since Se precipitates together with Mg, the content of Se can be allowed up to 20 massppm. However, even in this case, it is preferably 10 massppm or less, more preferably 5 massppm or less.
さらに、本発明の無方向性電磁鋼板は、上記必須成分、Ca,Mg以外に、Sb,Snを下記の範囲で添加することができる。
SbおよびSnは、0.0005mass%以上の添加により、集合組織を改善し、磁束密度を向上する効果があるので、0.0005mass%以上添加するのが好ましい。より好ましくは0.01mass%以上である。一方、過度の添加は、鋼板が脆化しやすくなるため、上限を0.05mass%とする。
Furthermore, in the non-oriented electrical steel sheet of the present invention, Sb and Sn can be added in the following ranges in addition to the essential components Ca and Mg.
Sb and Sn are preferably added in an amount of 0.0005 mass% or more because addition of 0.0005 mass% or more has the effect of improving the texture and improving the magnetic flux density. More preferably, it is 0.01 mass% or more. On the other hand, excessive addition tends to embrittle the steel sheet, so the upper limit is made 0.05 mass%.
なお、Tiは、鋼中のCやNと炭窒化物を形成するが、Ti含有量が多くなると、炭窒化物の析出量が多くなり鉄損を増大させるため、0.002mass%以下に制限することが好ましい。
上記成分以外は、Feおよび不可避的不純物である。
Ti forms carbonitride with C and N in the steel. However, if the Ti content increases, the amount of carbonitride deposited increases and the iron loss increases, so it is limited to 0.002 mass% or less. It is preferable to do.
Other than the above components are Fe and inevitable impurities.
次に、本発明の無方向性電磁鋼板の製造方法について説明する。
本発明の無方向性電磁鋼板は、成分組成を上記説明した範囲内とすること以外に、製造方法について特に制限されるものではなく、通常公知の方法でかまわない。すなわち、転炉で吹練した溶鋼を脱ガス処理して上記所定範囲の成分組成に調整し、引き続き、連続鋳造してスラブとし、熱間圧延する。熱間圧延における仕上圧延終了温度、巻取温度は、特に制限する必要はなく、通常の条件でかまわない。また、熱延後の熱延板焼鈍は、行っても良いが必須ではない。次いで、1回の冷間圧延もしくは中間焼鈍を挟んで2回以上の冷間圧延により所定の板厚とし、仕上焼鈍して、製品(無方向性電磁鋼板)とするのが好ましい。
Next, the manufacturing method of the non-oriented electrical steel sheet of this invention is demonstrated.
The non-oriented electrical steel sheet of the present invention is not particularly limited with respect to the production method except that the component composition is within the range described above, and may be a generally known method. That is, the molten steel blown in the converter is degassed to adjust the component composition within the predetermined range, and continuously cast into a slab and hot rolled. The finish rolling finish temperature and the coiling temperature in hot rolling need not be particularly limited, and may be normal conditions. Moreover, although hot-rolled sheet annealing after hot rolling may be performed, it is not essential. Next, it is preferable to obtain a predetermined sheet thickness by two or more cold rollings with one cold rolling or intermediate annealing and finish annealing to obtain a product (non-oriented electrical steel sheet).
転炉で吹練した溶鋼を脱ガス処理して、表1−1、1−2に示した成分組成を有する各種の鋼を溶製し、連続鋳造してスラブとし、該スラブを1100℃×1hrの加熱後、仕上圧延終了温度を800℃とする熱間圧延により板厚2.0mmの熱延板とし、610℃で巻き取った。次いで、この熱延板を、100vol%N2雰囲気中で1000℃×30秒の熱延板焼鈍を施した後、冷間圧延して板厚0.30mmの冷延板とし、その後、20vol%H2−80vol%N2雰囲気中で、表1に示す条件で仕上焼鈍を行い無方向性電磁鋼板とした。 The molten steel blown in the converter is degassed, various steels having the component compositions shown in Tables 1-1 and 1-2 are melted, continuously cast into a slab, and the slab is 1100 ° C. × After heating for 1 hr, a hot rolled sheet having a plate thickness of 2.0 mm was formed by hot rolling at a finish rolling finishing temperature of 800 ° C. and wound at 610 ° C. Subsequently, this hot-rolled sheet was subjected to hot-rolled sheet annealing at 1000 ° C. for 30 seconds in a 100 vol% N 2 atmosphere, and then cold-rolled to form a cold-rolled sheet having a thickness of 0.30 mm, and then 20 vol% in H 2 -80vol% N 2 atmosphere, it was non-oriented electrical steel sheet subjected to annealing finishing under the conditions shown in Table 1.
上記のようにして得た無方向性電磁鋼板から、幅30mm×長さ280mmのエプスタイン試験片を圧延方向および圧延直角方向より切り出し、JIS C2550に準拠して、最大磁束密度1.0T、周波数400Hzにおける鉄損W10/400および磁界の強さ5000A/mにおける磁束密度B50を測定し、結果を、表1−1、1−2中に併記して示した。 From the non-oriented electrical steel sheet obtained as described above, an Epstein test piece having a width of 30 mm and a length of 280 mm is cut out from the rolling direction and the direction perpendicular to the rolling direction, and in accordance with JIS C2550, the maximum magnetic flux density is 1.0 T and the frequency is 400 Hz. The iron loss W 10/400 and the magnetic flux density B 50 at a magnetic field strength of 5000 A / m were measured, and the results are shown in Tables 1-1 and 1-2.
表1−1,1−2から、本発明の成分組成に適合する無方向性電磁鋼板は、鉄損W10/400が12.40kg/kg以下、磁束密度B50が1.64T以上であり、磁気特性に優れていることがわかる。 From Tables 1-1 and 1-2, the non-oriented electrical steel sheet suitable for the composition of the present invention has an iron loss W 10/400 of 12.40 kg / kg or less and a magnetic flux density B 50 of 1.64 T or more. It can be seen that the magnetic properties are excellent.
本発明の無方向性電磁鋼板は、自動車用モータのコア材の他、エアコンプレッサーモータや工作機械用モータ、高速発電機等の分野にも適用することができる。 The non-oriented electrical steel sheet of the present invention can be applied to fields such as an air compressor motor, a machine tool motor, and a high-speed generator in addition to the core material of an automobile motor.
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