JP6597940B1 - 方向性電磁鋼板及びその製造方法 - Google Patents
方向性電磁鋼板及びその製造方法 Download PDFInfo
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Abstract
Description
本願は、2018年2月9日に日本に出願された特願2018−022233号に基づき優先権を主張し、その内容をここに援用する。
0.1μm ≦ A−B ≦ 5.0μm …(1)
上記のように、図3に示す断面内で、基準線31、最深点32及び最浅点33を定義したとき、本電磁鋼板では、基準線31と最深点32との間の最短距離Aと、基準線31と最浅点33との間の最短距離Bとの関係が下記(1)式を満たすように、グラス被膜21の根の構造が制御されている。
ここで、基準線31と最深点32との間の最短距離Aとは、基準線31に対して垂直な直線で最深点32と基準線31とを結んだときの、その直線の長さである。また、基準線31と最浅点33との間の最短距離Bとは、基準線31に対して垂直な直線で最浅点33と基準線31とを結んだときの、その直線の長さである。
以下では、板厚方向における最深点32と最浅点33との間の領域を界面混在領域34と定義し、最短距離Aから最短距離Bを減算して得られる値(=A−B)を界面混在領域34の厚さと定義する。界面混在領域34では、鋼とグラス被膜が混在している。
0.1μm ≦ A−B ≦ 5.0μm …(1)
界面混在領域34の厚さ(=A−B)が0.1μm未満の場合、グラス被膜21と地鉄(母材鋼板10)との密着性が低下するため、溝部の被膜にクラックが発生しやすくなる。そのため、界面混在領域34の厚さの下限は0.1μmである。一方、界面混在領域34の厚さが5.0μmを越える場合、グラス被膜21の根が過度に発達することに起因して磁歪の値が増大する。そのため、界面混在領域34の厚さの上限は5.0μmである。被膜の密着性向上効果と磁歪の低減効果とをバランス良く得るために、界面混在領域34の厚さは、1μm以上3μm以下であることが好ましい。
以上の理由から、本電磁鋼板の製造方法では、冷延鋼板の表面にレーザで溝を形成する工程において、レーザ照射部位を含む雰囲気が空気の場合、つまりアシストガスとして空気を用いる場合、その空気の露点を−30℃〜0℃に制御する。
なお、従来では、レーザ照射時に水分が発生することを防止するために、除湿されたアシストガスが用いられるが、そのようなアシストガスとして特別に露点が制御されたガスは用いられていない。一般的に工業的に使用される、いわゆるドライガスの露点は、−35℃程度であることが技術常識である。一方、本電磁鋼板の製造方法では、アシストガスの露点を積極的に特定範囲に制御することで、溝部におけるグラス被膜の根を特定の状態(式(1)を満たす状態)に制御し、その結果、磁気特性(磁歪)の改善とグラス被膜の密着性との両立を実現できたのである。アシストガスの露点を上記の特定範囲に制御することによりレーザ照射時に水分が発生する問題に対しては、レーザ照射時の雰囲気温度を90℃程度に保持しておくことで解決することができる。
Si:3.4質量%、Mn:0.15質量%、S:0.006質量%、C:0.045質量%、酸可溶解Al:0.022質量%、N:0.007質量%を含んだスラブを素材として公知の方法にて熱間圧延後、熱延板焼鈍を行い、冷間圧延で0.22mmを最終板厚とする鋼板を得た。
Si:3.4質量%、Mn:0.15質量%、S:0.006質量%、C:0.045質量%、酸可溶解Al:0.022質量%、N:0.007質量%を含んだスラブを素材として公知の方法にて熱間圧延後、熱延板焼鈍を行い、冷間圧延で0.22mmを最終板厚とする鋼板を得た。
Si:3.4質量%、Mn:0.15質量%、S:0.006質量%、C:0.045質量%、酸可溶解Al:0.022質量%、N:0.007質量%を含んだスラブを素材として公知の方法にて熱間圧延後、熱延板焼鈍を行い、冷間圧延で0.22mmを最終板厚とする鋼板を得た。
11 溝
21 グラス被膜
22 張力被膜
23 グラス被膜の根
31 基準線
32 最深点
33 最浅点
34 界面混在領域
35 ピーク点
θ 溝が圧延方向に対して垂直な方向となす角度
W 溝の幅
D 溝の深さ
d 溝の間隔
Claims (2)
- 表面に複数の溝を有する母材鋼板と、前記母材鋼板の前記表面に形成されたグラス被膜とを備える方向性電磁鋼板であって、
前記母材鋼板の圧延方向及び板厚方向に直交する方向と、前記溝の長手方向との成す角が0〜40°であり、
前記溝の幅が20〜300μmであり、
前記溝の深さが10〜40μmであり、
前記圧延方向における前記溝の間隔が2〜30mmであり、
前記溝の長手方向に直交する断面で前記溝を含む領域をみた場合に、
前記グラス被膜の輪郭線上に存在し且つ前記板厚方向の最も高い位置に存在する点をピーク点と定義し、
前記ピーク点を通り且つ前記断面内で前記板厚方向に直交する溝幅方向に平行な直線を基準線と定義し、
前記グラス被膜と前記母材鋼板との境界線上に存在し且つ前記板厚方向の最も低い位置に存在する点を最深点と定義し、
前記最深点を中心として前記溝幅方向に2μmの長さを有する領域において前記境界線上に存在し且つ前記板厚方向の最も高い位置に存在する点を最浅点と定義したとき、
前記基準線と前記最深点との間の最短距離Aと、前記基準線と前記最浅点との間の最短距離Bとの関係が下記(1)式を満たす、
ことを特徴とする方向性電磁鋼板。
0.1μm ≦ A−B ≦ 5.0μm …(1) - 請求項1に記載の方向性電磁鋼板を製造する方法であって、
冷延鋼板の表面にレーザで溝を形成する工程を含み、
前記工程において、レーザ照射部位を含む雰囲気の形成に用いられるアシストガスが空気または不活性ガスであり、前記空気の露点が−30℃〜0℃であり、前記不活性ガスの露点が−20℃〜20℃である
ことを特徴とする方向性電磁鋼板の製造方法。
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