JPWO2020149347A1 - 方向性電磁鋼板の製造方法 - Google Patents
方向性電磁鋼板の製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 title claims description 32
- 238000000137 annealing Methods 0.000 claims abstract description 211
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000005097 cold rolling Methods 0.000 claims abstract description 15
- 238000005098 hot rolling Methods 0.000 claims abstract description 15
- 238000005261 decarburization Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 90
- 239000010959 steel Substances 0.000 abstract description 90
- 239000011248 coating agent Substances 0.000 abstract description 47
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 90
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 87
- 239000000395 magnesium oxide Substances 0.000 description 45
- 229910052742 iron Inorganic materials 0.000 description 42
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 28
- 229910052863 mullite Inorganic materials 0.000 description 28
- 229910052839 forsterite Inorganic materials 0.000 description 25
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 25
- 229910004298 SiO 2 Inorganic materials 0.000 description 22
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- 238000010586 diagram Methods 0.000 description 3
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
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- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Abstract
Description
本願は、2019年1月16日に、日本に出願された特願2019−5083号に基づき優先権を主張し、その内容をここに援用する。
本発明者らは、この針状介在物が磁壁の移動を妨げる原因、つまり鉄損に悪影響を及ぼす原因だと推測した。本発明者らがさらなる研究を行った結果、焼鈍分離剤の成分と塗布量を特定の条件下で制御することにより、母材鋼板の表層領域において針状介在物の生成を抑制でき、母材鋼板と張力絶縁被膜との間にフォルステライト系被膜が存在しない方向性電磁鋼板の鉄損を従来よりも低減できることを見出した。
熱間圧延工程は、所定の化学組成を有するスラブに熱間圧延を施すことにより熱延板を得る工程である。熱延板焼鈍工程は、熱延板に熱延板焼鈍を施すことにより焼鈍熱延板を得る工程である。冷間圧延工程は、焼鈍熱延板に冷間圧延を施すことにより冷延板を得る工程である。脱炭焼鈍工程は、冷延板に脱炭焼鈍を施すことにより脱炭焼鈍板を得る工程である。焼鈍分離剤塗布工程は、脱炭焼鈍板にアルミナを主成分とする焼鈍分離剤を塗布する工程である。仕上げ焼鈍工程は、焼鈍分離剤が塗布された脱炭焼鈍板に仕上げ焼鈍を施す工程である。
各工程の詳細については後述するが、本製造方法において、最終製品である方向性電磁鋼板の母材鋼板の表層領域に針状介在物が生成されるのを抑制するために、以下の2つの製造条件を満たしていることが特徴である。
(条件1)アルミナを主成分とする焼鈍分離剤は、28〜50質量%のMgOを含有する。
(条件2)焼鈍分離剤の塗布量は、脱炭焼鈍板の片面当たり6.0〜14.0g/m2である。
(y)仕上げ焼鈍中、AlN(インヒビター)の分解で生成したAlが、焼鈍分離剤のAl成分に加わり、焼鈍分離剤におけるMgOの比率が相対的に低下し、焼鈍分離剤の成分組成が、ムライト生成域に移行する(図1参照)。
上記のような本発明者らによる研究結果に基づき、本製造方法では、以下の2つの製造条件を満たしていることを特徴としている。
(条件1)アルミナを主成分とする焼鈍分離剤は、28〜50質量%のMgOを含有する。
(条件2)焼鈍分離剤の塗布量は、脱炭焼鈍板の片面当たり6.0〜14.0g/m2である。
図2に示すように、焼鈍分離剤のMgO量が28質量%以上であると、ムライトが生成せず、かつ、図3に示すように、鉄損W17/50が1.00W/kg未満と優位である。そのため、焼鈍分離剤のMgO量は28質量%以上とする。好ましくは32質量%以上、より好ましくは35%質量以上である。
図4に示すように、MgOを45質量%含む焼鈍分離剤の片面当たりの塗布量が6.0g/m2未満であると、“長さ1μm以上の針状介在物(ムライト)”が生成するので、焼鈍分離剤の塗布・乾燥後の片面単位面積当たりの付着量(脱炭焼鈍板の片面当たりの焼鈍分離剤の塗布量)は6.0g/m2以上とする。好ましくは7.0g/m2以上、より好ましくは8.0g/m2以上である。
Cは、一次再結晶組織の制御に有効な元素であるが、磁気特性に悪影響を及ぼすので、仕上げ焼鈍前に脱炭焼鈍で除去する元素である。C量が0.085%を超えると、脱炭焼鈍時間が長くなり、生産性が低下するので、C量は0.085%以下とする。C量は好ましくは0.070%以下、より好ましくは0.050%以下である。
Siは、鋼板の電気抵抗を高めて、鉄損特性を改善する元素である。Si量が0.80%未満では、仕上げ焼鈍時にγ変態が生じ、鋼板の結晶方位が損なわれるので、Si量は0.80%以上とする。Si量は好ましくは1.50%以上、より好ましくは2.50%以上である。
Mnは、熱間圧延時の割れを防止するとともに、S及び/又はSeと結合して、インヒビターとして機能するMnSを形成する元素である。Mn量が0.05%未満では、添加効果が十分に発現しないので、Mn量は0.05%以上とする。Mn量は好ましくは0.07%以上、より好ましくは0.09%以上である。
酸可溶性Alは、Nと結合して、インヒビターとして機能する(Al、Si)Nを生成する元素である。酸可溶性Al量が0.010%未満では、添加効果が十分に発現せず、二次再結晶が十分に進行しないので、酸可溶性Al量は0.010%以上とする。酸可溶性Al量は好ましくは0.015%以上、より好ましくは0.020%以上である。
Nは、Alと結合して、インヒビターとして機能するAlNを形成する元素であるが、一方で、冷間圧延時、鋼板中にブリスター(空孔)を形成する元素でもある。N量が0.004%未満では、AlNの形成が不十分となるので、N量は0.004%以上とする。N量は好ましくは0.006%以上、より好ましくは0.007%以上である。
Sは、Mnと結合して、インヒビターとして機能するMnSを形成する元素である。
Bは、Nと結合し、MnSと複合析出して、インヒビターとして機能するBNを形成する元素である。
表1に示す成分組成のスラブを1100℃に加熱して熱間圧延に供し、板厚2.60mmの熱延板とし、該熱延板に1100℃で熱延板焼鈍を施した後、中間焼鈍を挟む複数回の冷間圧延に供し、最終板厚0.23mmの冷延板として巻き取った。
比較例b4及びb5では、焼鈍分離剤の塗布量が片面当たり6.0〜14.0g/m2の範囲に制御されているが、焼鈍分離剤のMgO量が50質量%超である。この場合、母材鋼板の観察領域に長さ1μm以上の針状介在物(ムライト)は存在しないが、フォルステライトが生成され、その結果、鉄損W17/50が1.00W/kg超に上昇した。
比較例b6では、焼鈍分離剤のMgO量は28質量%以上であるが、焼鈍分離剤の塗布量が片面当たり6.0g/m2未満であるので、母材鋼板の観察領域に長さ1μm以上の針状介在物(ムライト)が複数存在し、鉄損W17/50は1.00W/kg超に上昇した。
比較例b7〜b15では、焼鈍分離剤のMgO量は28質量%〜50質量%の範囲に制御されているが、焼鈍分離剤の塗布量が片面当たり6.0g/m2未満であるので、母材鋼板の観察領域に長さ1μm以上の針状介在物(ムライト)が複数存在し、鉄損W17/50は1.00W/kg超に上昇した。
表1に示す鋼No.A5の成分組成のスラブを1100℃に加熱して熱間圧延に供し、板厚2.60mmの熱延板とし、該熱延板に1100℃で熱延板焼鈍を施した後、中間焼鈍を挟む複数回の冷間圧延に供し、最終板厚0.23mmの冷延板として巻き取った。
Claims (3)
- スラブに熱間圧延を施すことにより熱延板を得る工程と、
前記熱延板に熱延板焼鈍を施すことにより焼鈍熱延板を得る工程と、
前記焼鈍熱延板に冷間圧延を施すことにより冷延板を得る工程と、
前記冷延板に脱炭焼鈍を施すことにより脱炭焼鈍板を得る工程と、
前記脱炭焼鈍板にアルミナを主成分とする焼鈍分離剤を塗布する工程と、
前記焼鈍分離剤が塗布された前記脱炭焼鈍板に仕上げ焼鈍を施す工程と
を有し、
前記焼鈍分離剤は、28〜50質量%のMgOを含有し、
前記焼鈍分離剤の塗布量は、前記脱炭焼鈍板の片面当たり6.0〜14.0g/m2であることを特徴とする方向性電磁鋼板の製造方法。 - 前記アルミナのBET比表面積が3.0〜10.0m2/gであることを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記スラブは、化学組成として、質量%で、
C:0.085%以下、
Si:0.80〜7.00%、
Mn:0.05〜1.00%、
酸可溶性Al:0.010〜0.065%、
S:0.01%以下、
N:0.004%〜0.012%、
B:0.0005〜0.0080%、
P:0〜0.50%、
Ni:0〜1.00%、
Sn:0〜0.30%、
Sb:0〜0.30%、
Cu:0〜0.40%、
Cr:0〜0.30%、
Bi:0〜0.01%、
を含有し、残部がFe及び不純物からなる
ことを特徴とする請求項1又は2に記載の方向性電磁鋼板の製造方法。
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