JP6915688B2 - 方向性電磁鋼板 - Google Patents
方向性電磁鋼板 Download PDFInfo
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Description
本願は、2017年7月13日に、日本に出願された特願2017−137443号に基づき優先権を主張し、その内容をここに援用する。
上記切断面で見たとき、板厚方向と直交する方向の観察視野の全長を単位μmでLzとし、板厚方向と直交する方向の選択酸化領域の合計長さを単位μmでLxとし、選択酸化領域の線分率Xを下記の式1で定義するとき、線分率Xが0.1%以上かつ21%以下であり、
上記中間層が、化学成分として、Fe含有量:80原子%未満、P含有量:5原子%未満、Si含有量:20原子%以上、O含有量:50原子%以上、Mg含有量:10原子%以下を満足する。
X=(Lx÷Lz)×100 ・・・(式1)
上記中間層と上記母材鋼板との界面に、上記コーティング溶液の焼き付け焼鈍時に母材鋼板表面が選択酸化されて形成された酸化珪素主体の選択酸化領域が離散して存在する。
切断方向が板厚方向と平行となる切断面(詳細には、板厚方向と平行かつ圧延方向と垂直な切断面)で見たとき、上記中間層が選択酸化領域を有し、
選択酸化領域が存在する領域の中間層の厚さが50nm以上であり、選択酸化領域が存在しない領域の中間層の厚さが50nm未満である。
上記した変則三層構造において、基材である母材鋼板は、結晶方位がゴス方位に制御された集合組織を有する。母材鋼板の表面粗度は、特に制限されないが、母材鋼板に大きい張力を付与して鉄損の低減を図る点で、算術平均粗さ(Ra)で0.5μm以下が好ましく、0.3μm以下がより好ましい。なお、母材鋼板の算術平均粗さ(Ra)の下限は、特に制限されないが、0.1μm以下では鉄損改善効果が飽和してくるので下限を0.1μmとしてもよい。
上記した変則三層構造において、絶縁皮膜は、燐酸塩とコロイド状シリカを主体とするコーティング溶液を塗布して焼き付けて形成されるガラス質の絶縁皮膜である。この絶縁皮膜は、母材鋼板に高い面張力を付与することができる。
上記した変則三層構造において、酸化珪素主体の中間層(選択酸化領域を含む)は、母材鋼板および絶縁被膜の間に配され、母材鋼板と絶縁皮膜とを密着させる機能を有する。
中間層形成のための焼鈍処理は、経済的観点から、より低い温度でより短い時間であることが好ましい。そのため、形成される中間層の厚さは最小限にならざるを得ない。本発明電磁鋼板では、選択酸化領域が存在しない領域の中間層の厚さが50nm未満となる。
酸化珪素主体の中間層の上に、燐酸塩とコロイド状シリカを主体とするコーティング溶液を塗布して焼き付けてガラス質の絶縁皮膜を形成する際、焼き付け時の熱処理により母材鋼板表面が酸化されて、中間層と母材鋼板との界面に酸化珪素主体の選択酸化領域が離散して生成する(図3、参照)。
X=(Lx÷Lz)×100 ・・・(式1)
Lx(μm):選択酸化領域の板厚方向と直交する方向の長さの合計
Lz(μm):選択酸化領域の板厚方向と直交する方向の観察域の全長
本発明電磁鋼板の母材鋼板は、例えば、Si:0.8〜7.0%を含有し、C:0.005%以下、N:0.005%以下、SおよびSeの合計量:0.005%以下、ならびに酸可溶性Al:0.005%以下に制限し、残部がFe及び不純物からなる。
Si(シリコン)は、方向性電磁鋼板の電気抵抗を高めて鉄損を低下させる。Si含有量の好ましい下限は0.8%であり、さらに好ましくは2.0%である。一方、Si含有量が7.0%を超えると、母材鋼板の飽和磁束密度が低下するため、鉄心の小型化が難くなる。Si含有量の好ましい上限は7.0%である。
C(炭素)は、母材鋼板中で化合物を形成し、鉄損を劣化させるため、少ないほど好ましい。C含有量は、0.005%以下に制限することが好ましい。C含有量の好ましい上限は0.004%であり、さらに好ましくは0.003%である。Cは少ないほど好ましいので、下限は0%を含むが、Cを0.0001%未満に低減すると、製造コストが大幅に上昇するので、製造上、0.0001%が実質的な下限である。
N(窒素)は、母材鋼板中で化合物を形成し、鉄損を劣化させるため、少ないほど好ましい。N含有量は、0.005%以下に制限することが好ましい。N含有量の好ましい上限は0.004%であり、さらに好ましくは0.003%である。Nは少ないほど好ましいので、下限が0%であればよい。
S(硫黄)及びSe(セレン)は、母材鋼板中で化合物を形成し、鉄損を劣化させるため、少ないほど好ましい。SまたはSeの一方、または両方の合計を0.005%以下に制限することが好ましい。SおよびSeの合計量は、0.004%以下が好ましく、0.003%以下がさらに好ましい。SまたはSeの含有量は少ないほど好ましいので、下限がそれぞれ0%であればよい。
酸可溶性Al(酸可溶性アルミニウム)は、母材鋼板中で化合物を形成し、鉄損を劣化させるため、少ないほど好ましい。酸可溶性Alは、0.005%以下であることが好ましい。酸可溶性Alは、0.004%以下が好ましく、0.003%以下がさらに好ましい。酸可溶性Alは少ないほど好ましいので、下限が0%であればよい。
Mn:0%以上かつ0.15%以下、
Bi:0%以上かつ0.010%以下、
B:0%以上かつ0.080%以下、
Ti:0%以上かつ0.015%以下、
Nb:0%以上かつ0.20%以下、
V:0%以上かつ0.15%以下、
Sn:0%以上かつ0.30%以下、
Sb:0%以上かつ0.30%以下、
Cr:0%以上かつ0.30%以下、
Cu:0%以上かつ0.40%以下、
P:0%以上かつ0.50%以下、
Ni:0%以上かつ1.00%以下、及び
Mo:0%以上かつ0.10%以下。
C(炭素)は、一次再結晶集合組織を制御するうえで有効な元素である。Cは0.005%以上であることが好ましい。また、Cは、0.02%以上、0.04%以上、0.05%以上であることがさらに好ましい。Cが0.085%を超えると、脱炭工程で脱炭が十分に進行せず、所要の磁気特性が得られないので、Cは0.085%以下が好ましい。より好ましくは0.065%以下である。
(a)仕上げ焼鈍で生成したフォルステライト等の無機鉱物質の皮膜を、酸洗、研削等の手段で除去した母材鋼板を焼鈍し、又は、
(b)仕上げ焼鈍で上記無機鉱物質の皮膜の生成を抑制した母材鋼板を焼鈍し、
(c)上記焼鈍(熱酸化焼鈍、露点を制御した雰囲気下での焼鈍)によって、母材鋼板の表面上に酸化珪素主体の中間層を形成し、
(d)この中間層上に、燐酸塩とコロイド状シリカを主体とする絶縁皮膜コーティング溶液を塗布して焼き付け、
(e)上記の焼き付け時の熱処理によって、母材鋼板表面を酸化して、中間層と鋼板との界面に、中間層と形態が異なる酸化珪素主体の選択酸化領域を離散して形成する。
本発明製造方法によって、中間層の厚さが薄くて皮膜密着性が劣位の部位に選択酸化領域を適切に形成することができる。
表1に示す成分組成の素材鋼片を1150℃で60分均熱してから熱間圧延に供し、2.6mm厚の熱延鋼板とした。次いで、この熱延鋼板に、1120℃で200秒保持した後、直ちに冷却して、900℃で120秒保持し、その後に急冷する熱延板焼鈍を施した。この熱延焼鈍板を酸洗後、冷間圧延に供し、最終板厚0.27mmの冷延鋼板とした。
2 フォルステライト皮膜
3 絶縁皮膜
4 中間層
5a、5b、5c 選択酸化領域
La、Lb、Lc 選択酸化領域の長さ
t 選択酸化領域の厚さ
Claims (3)
- 母材鋼板と、前記母材鋼板上に接して配された中間層と、前記中間層上に接して配されて最表面となる絶縁皮膜とを有する方向性電磁鋼板において、
切断方向が板厚方向と平行となる切断面で見たとき、前記中間層が選択酸化領域を有し、
前記選択酸化領域が存在する領域の中間層の厚さが50nm以上であり、前記選択酸化領域が存在しない領域の中間層の厚さが50nm未満であり、
前記切断面で見たとき、板厚方向と直交する方向の観察視野の全長を単位μmでLzとし、板厚方向と直交する方向の前記選択酸化領域の合計長さを単位μmでLxとし、前記選択酸化領域の線分率Xを下記の式1で定義するとき、前記線分率Xが0.1%以上かつ21%以下であり、
前記中間層が、化学成分として、Fe含有量:80原子%未満、P含有量:5原子%未満、Si含有量:20原子%以上、O含有量:50原子%以上、Mg含有量:10原子%以下を満足する
ことを特徴とする方向性電磁鋼板。
X=(Lx÷Lz)×100 ・・・(式1) - 前記切断面で見たとき、前記線分率Xが0.1%以上かつ12%以下である
ことを特徴とする請求項1に記載の方向性電磁鋼板。 - 前記選択酸化領域が存在する領域の前記中間層の前記厚さが50nm以上かつ400nm以下であり、前記選択酸化領域が存在しない領域の前記中間層の前記厚さが2nm以上かつ50nm未満である
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。
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