JPWO2021020026A1 - 方向性電磁鋼板 - Google Patents
方向性電磁鋼板 Download PDFInfo
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- 229910000976 Electrical steel Inorganic materials 0.000 title description 3
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 72
- 229910052742 iron Inorganic materials 0.000 abstract description 34
- 230000000694 effects Effects 0.000 abstract description 26
- 230000004907 flux Effects 0.000 abstract description 12
- 230000009467 reduction Effects 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 43
- 239000010959 steel Substances 0.000 description 43
- 238000000034 method Methods 0.000 description 36
- 238000000137 annealing Methods 0.000 description 22
- 238000005755 formation reaction Methods 0.000 description 14
- 230000005381 magnetic domain Effects 0.000 description 14
- 230000015572 biosynthetic process Effects 0.000 description 13
- 229910052839 forsterite Inorganic materials 0.000 description 13
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 13
- 239000000463 material Substances 0.000 description 10
- 230000035699 permeability Effects 0.000 description 10
- 239000003112 inhibitor Substances 0.000 description 9
- 230000006866 deterioration Effects 0.000 description 8
- 238000000866 electrolytic etching Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 229910052711 selenium Inorganic materials 0.000 description 4
- 238000009751 slip forming Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 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 2
- 229960002261 magnesium phosphate Drugs 0.000 description 2
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 2
- 239000004137 magnesium phosphate Substances 0.000 description 2
- 235000010994 magnesium phosphates Nutrition 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
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Abstract
Description
まず、鋼板表面に形成する溝の形状について検討を行った。前述の通り、鋼板に溝を形成した時、透磁率が劣化する。この透磁率の劣化の大きさは、溝の体積に相関するものであるため、形成する溝の体積は極力小さい方が好ましい。したがって、鋼板に形成する溝の形状は、板幅方向に連続的に形成させたもの、すなわち板幅方向に途切れなく溝を形成させたものが最も好ましいと考えられる。一方、このように形成させた溝による鉄損低減効果は、板幅方向に連続的に形成されていない小規模の溝群を、隣り合う溝の端部同士を圧延方向と直交する投影面上で重なるように形成したものに比べて小さい。これは、磁区細分化効果は、磁化の不連続部分、すなわち溝の表面積が大きいほど高い効果が得られるためである。
0.05≦b/a≦0.95 ・・・(1)
なお、前記中心線の不連続部2は、より詳細には、中心線P(線状溝1の溝幅aの中心を通り、線状溝1の長さ方向(線状溝1の形成方向)に平行な線)が、平行ではあるが、同一直線上にはない領域(中心線が並行して存在する領域)である。
前記線状溝は、前記線状溝の溝幅の中心線の位置が、前記線状溝の溝幅方向にずれた中心線の不連続部を有し、
前記線状溝の溝幅をa、前記中心線の不連続部における中心線間の溝幅方向の距離をbとしたとき、
前記a及びbが下記式(1)の関係を満たす、方向性電磁鋼板。
0.05≦b/a≦0.95 ・・・(1)
[2]前記中心線の不連続部の線状溝長さ方向の長さが、0mm以上50mm以下である、[1]に記載の方向性電磁鋼板。
本発明によれば、線状溝を形成した耐熱型磁区細分化方向性電磁鋼板において、従来よりも磁束密度の劣化を抑制しつつ、高い鉄損低減効果を得ることができる。
本発明の方向性電磁鋼板用の鋼素材(スラブ)の基本成分、インヒビター成分および任意添加成分について具体的に述べる。
C:0.08質量%以下
Cは、熱延板組織の改善のために添加するが、Cの含有量が0.08質量%を超えると磁気時効の起こらない50質量ppm以下まで製造工程中に脱炭することが困難となるため、C含有量は0.08質量%以下とすることが望ましい。また、Cを含まない鋼素材でも二次再結晶することから、C含有量の下限については特に設けない。
Siは、鋼の電気抵抗を増大させ、鉄損を改善するのに有効な元素である。しかしながら、Siの含有量が2.0質量%未満ではその改善効果が十分に発揮されず、一方8.0質量%を超えると加工性、通板性が著しく劣化することに加え、磁束密度も低下する。そのため、Si含有量は2.0〜8.0質量%の範囲とすることが望ましい。
Mnは、熱間加工性を向上させるうえで必要な元素である。しかしながら、Mnの含有量が0.005質量%未満ではその効果を十分に得ることが出来ず、一方1.0質量%を超えると磁束密度が劣化する。そのため、Mn含有量は0.005〜1.0質量%の範囲とすることが好ましい。
本発明において、方向性電磁鋼板のスラブの成分組成は、二次再結晶が生じる成分組成であればよい。二次再結晶を生じさせるためにインヒビターを利用する場合、例えばAlN系インヒビターを利用する場合であればAlおよびNを、またMnS・MnSe系インヒビターを利用する場合であれば、MnとSe及び/またはSを適量含有させればよい。もちろん両インヒビターを併用してもよい。この場合における、Al、N、S及びSeの好適含有量はそれぞれ、
Al:0.010〜0.065質量%
N:0.0050〜0.0120質量%
S:0.005〜0.030質量%
Se:0.005〜0.030質量%
である。
Al:0.010質量%以下
N:0.0050質量%以下
S:0.0050質量%以下
Se:0.0050質量%以下
に抑制することが好ましい。
Ni:0.03〜1.50質量%、
Sn:0.01〜1.50質量%、
Sb:0.005〜1.50質量%、
Cu:0.03〜3.0質量%、
P:0.03〜0.50質量%、
Mo:0.005〜0.10質量%、
Cr:0.03〜1.50質量%のうちから選ばれる1種以上
本発明における溝の形成方法には、グラビア印刷法やインクジェット印刷法によって、中心線の不連続部が形成されるようにレジストパターンを印刷し、非印刷部を電解エッチング法により溝形成する方法、鋼板全面にレジストインクを塗布しレジストを形成した後、レーザー照射によって中心線の不連続部が形成されるようにパターニング(レジスト除去)を行った後、レジストが除去された露出部を電解エッチング法により溝形成する方法等が挙げられるが、特に限定するものではない。
下記に、本発明において好適な溝寸法を示す。ここで溝寸法とは、溝幅、溝深さに加え、方向性電磁鋼板(鋼帯)の圧延方向に周期的に形成する溝同士の間隔及び、線状溝の延伸方向と板幅方向の成す角を意味する。
溝幅が広いほど、同程度の溝深さとしたときの透磁率の劣化が大きいため、狭いほど好適である。したがって、溝幅は300μm以下とするのが好ましい。しかし、溝幅が過剰に狭くなった時、溝両端における磁極カップリングにより、鉄損改善効果が低下してしまうため、溝幅の下限を10μmとするのが好適である。
溝形成による鉄損改善効果は、溝側壁部の表面積、すなわち溝の形成深さが大きい(深い)ほど高い効果が得られる。したがって、板厚に対して4%以上の深さの溝を形成させることが好適である。一方、溝の深さを増していくと、当然溝の体積も増加し、透磁率が劣化する傾向となる。さらに、通板時に溝部を起点に破断のリスクがある。以上を踏まえ、溝深さの上限を板厚に対して25%とするのが好適である。
先述の通り、鉄損改善効果は溝側壁部の表面積が大きいほど向上するため、圧延方向における溝の形成間隔は狭いほど良好な結果を得られる。しかしながら、溝の形成間隔が狭まるにつれ、鋼板に対する溝の体積分率も増加し透磁率の劣化に加えて、操業時の破断のリスクも高まる。したがって、圧延方向における溝の形成間隔を1.5mm〜10mmとするのが好適である。
溝の延伸方向が板幅方向から傾くほど、溝の体積が増加するため、透磁率が劣化する傾向となる。したがって、線状溝と板幅方向の成す角は±30°以内とすることが好ましい。
本発明の中心線の不連続部における溝幅a、中心線間の溝幅方向の距離b、ラップ長cは、張力被膜形成後の方向性電磁鋼板の表面を、光学顕微鏡で観察し、該当箇所の長さを計測して求める。溝深さの測定は、レーザー顕微鏡を用いて前記鋼板の表面を観察し、延伸方向に沿って溝部の深度プロファイルを取得する。得られた各点の深度プロファイルにおける、最深部の平均値を溝深さとする。
2 中心線の不連続部
Claims (2)
- 方向性電磁鋼板の圧延方向と交差する方向に、線状溝が、前記圧延方向に周期的に形成された方向性電磁鋼板であって、
前記線状溝は、前記線状溝の溝幅の中心線の位置が、前記線状溝の溝幅方向にずれた中心線の不連続部を有し、
前記線状溝の溝幅をa、前記中心線の不連続部における中心線間の溝幅方向の距離をbとしたとき、
前記a及びbが下記式(1)の関係を満たす、方向性電磁鋼板。
0.05≦b/a≦0.95 ・・・(1) - 前記中心線の不連続部の線状溝長さ方向の長さが、0mm以上50mm以下である、請求項1に記載の方向性電磁鋼板。
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