JP5447738B2 - 方向性電磁鋼板 - Google Patents
方向性電磁鋼板 Download PDFInfo
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- JP5447738B2 JP5447738B2 JP2013527811A JP2013527811A JP5447738B2 JP 5447738 B2 JP5447738 B2 JP 5447738B2 JP 2013527811 A JP2013527811 A JP 2013527811A JP 2013527811 A JP2013527811 A JP 2013527811A JP 5447738 B2 JP5447738 B2 JP 5447738B2
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- 229910000976 Electrical steel Inorganic materials 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 53
- 239000010959 steel Substances 0.000 claims description 53
- 238000005096 rolling process Methods 0.000 claims description 52
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 claims description 36
- 230000005381 magnetic domain Effects 0.000 claims description 29
- 238000000576 coating method Methods 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 25
- 229910052839 forsterite Inorganic materials 0.000 claims description 15
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 15
- 238000010894 electron beam technology Methods 0.000 claims description 14
- 238000005452 bending Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 39
- 238000000137 annealing Methods 0.000 description 23
- 229910052742 iron Inorganic materials 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 238000001953 recrystallisation Methods 0.000 description 11
- 239000011162 core material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000003112 inhibitor Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910052711 selenium Inorganic materials 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000008119 colloidal silica Substances 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 235000010994 magnesium phosphates Nutrition 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Description
たとえば、特許文献1には、最終製品板にレーザーを照射し、鋼板表層に線状の高転位密度領域を導入することにより、磁区幅を狭くして鉄損を低減する技術が提案されている。
すなわち、本発明の要旨構成は次のとおりである。
(1)鋼板の表裏面にフォルステライト被膜および張力コーティングをそなえる方向性電磁鋼板(の片面)に、線状の熱歪みを導入する磁区細分化処理が施された方向性電磁鋼板であって、該鋼板の圧延方向の反り量が前記熱歪みの導入面を内側とする反り面の曲率半径で600mm以上6000mm以下であり、かつ前記圧延方向と直角方向の反り量が前記歪みの導入面を内側とする反り面の曲率半径で2000mm以上であることを特徴とする方向性電磁鋼板。
曲率半径R=(L2+4x2)/8x
なお、上式は、図2に示すところに従う、関係2式
L=2Rsin(θ/2)
x=R{1−cos(θ/2)}
より、導出した。なお、圧延方向と直角方向の反り量を評価する場合は、圧延方向と直角方向へ300mmおよび圧延方向へ100mmの試料を切り出し、同様の測定を行って曲率半径を算出する。
方向性電磁鋼板の製品板の表層には、フォルステライト被膜および張力コーティングが形成されているのが一般的であり、鉄損低減のために施される、レーザー照射あるいは電子ビーム照射等は、張力コーティングの表面に施されている。その鉄損低減のメカニズムは、鋼板表面への高エネルギービーム照射により熱歪みが与えられて鋼板の磁区が細分化されて発現するものである。
そこで、連続レーザーを用いて、照射ビーム強度、および種々の繰り返し照射ピッチにて磁区を制御した鋼板を製作して、この鋼板から500mm角の三相三脚変圧器のモデル鉄心を作製して、鋼板反り量と鉄心が発する騒音とに関して詳細に検討した。使用した方向性電磁鋼板の重量はおよそ20kgであり、鉄心全面に面圧で98.1kPa (1.0kgf/cm2)の荷重をかけて、磁束密度1.7Tおよび周波数50Hzの交流励磁を行い、騒音測定を実施した。
本発明において、方向性電磁鋼板用スラブの成分組成は、特に制限はなく、二次再結晶が生じる成分組成であればよい。
この場合には、Al、N、SおよびSe量はそれぞれ、Al:100質量ppm以下、N:50質量ppm以下、S:50質量ppm以下、Se:50質量ppm以下に抑制することが好ましい。
C:0.08質量%以下
Cは、熱延板組織の改善のために添加をするが、0.08質量%を超えると製造工程中に磁気時効の起こらない50質量ppm以下までCを低減することが困難になるため、0.08質量%以下とすることが好ましい。なお、下限に関しては、Cを含まない素材でも二次再結晶が可能であるので特に設ける必要はない。
Siは、鋼の電気抵抗を高め、鉄損を改善するのに有効な元素であるが、含有量が2.0質量%に満たないと十分な鉄損低減効果が達成できず、一方、8.0質量%を超えると加工性が著しく低下し、また磁束密度も低下するため、Si量は2.0〜8.0質量%の範囲とすることが好ましい。
Mnは、熱間加工性を良好にする上で必要な元素であるが、含有量が0.005質量%未満ではその添加効果に乏しく、一方1.0質量%を超えると製品板の磁束密度が低下するため、Mn量は0.005〜1.0質量%の範囲とすることが好ましい。
上記の基本成分以外に、磁気特性改善成分として、次に述べる元素を適宜含有させることができる。
Niは、熱延板組織を改善して磁気特性を向上させるために有用な元素である。しかしながら、含有量が0.03質量%未満では磁気特性の向上効果が小さく、一方1.5質量%を超えると二次再結晶が不安定になり磁気特性が劣化する。そのため、Ni量は0.03〜1.5質量%の範囲とするのが好ましい。
なお、上記成分以外の残部は、製造工程において混入する不可避的不純物およびFeである。
なお、張力コーティングを施す際には塗布量・焼付け条件を調整し、発生張力を十分に発揮させることが肝要である。
レーザー照射時の圧延方向の照射列の間隔は4mmで一定としたが、連続レーザーの強度は一定の条件だけではなく、走査中に強度を50〜100%の範囲で変化させること、焦点をジャスト位置からややぼかした位置に変更して照射すること、により反りを調整した。
電子ビーム照射時の圧延方向の照射列の間隔は5mmで一定とした。電子ビームは連続的に照射したのではなく、ドット状に照射し、その点列間隔を0.1〜1.0mmの範囲で変化させた。またビーム強度のプロファイルをビーム電流および収束コイルの電流量を調整することで変化させた。
Claims (4)
- 鋼板の表裏面にフォルステライト被膜および張力コーティングをそなえる方向性電磁鋼板に、線状の熱歪みを導入する磁区細分化処理が施された方向性電磁鋼板であって、該鋼板の圧延方向の反り量が前記歪みの導入面を内側とする反り面の曲率半径で600mm以上6000mm以下であり、かつ前記圧延方向と直角方向の反り量が前記歪みの導入面を内側とする反り面の曲率半径で2000mm以上であることを特徴とする方向性電磁鋼板。
- 前記磁区細分化処理に供する方向性電磁鋼板は、前記フォルステライト被膜および張力コーティングを併せた被膜張力が鋼板表裏面で等しく、かつ鋼板表裏面のいずれか片面のみのフォルステライト被膜および張力コーティングを除去した際の反り量が該反り面の曲率半径で500mm以下である請求項1に記載の方向性電磁鋼板。
- 前記線状の熱歪みが、レーザビームの照射により導入されてなる請求項1または2に記載の方向性電磁鋼板。
- 前記線状の熱歪みが、電子ビームの照射により導入されてなる請求項1または2に記載の方向性電磁鋼板。
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