JP7231642B2 - 耐熱磁区細分化型方向性珪素鋼及びその製造方法 - Google Patents
耐熱磁区細分化型方向性珪素鋼及びその製造方法 Download PDFInfo
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Description
表1は、実施例1~22及び比較例1~10の耐熱磁区細分化型方向性珪素鋼の溝1の特徴パラメータを示す。
(1)方向性珪素鋼に対して製鉄、製鋼、連続鋳造、熱間圧延プロセスを行い、さらに最終厚さ0.23mmになるまで冷間圧延を1回行うステップと、
(2)850℃の脱炭焼鈍プロセスによって、表面酸化層を形成した後、その表面にMgO分離剤を塗布し、巻き取って鋼ロールを形成するステップと、
(3)1200℃の高温焼鈍条件で20時間維持し、その後、その表面に絶縁コーティングを塗布し、最終焼鈍を行って方向性珪素鋼板を形成するステップと、
(4)方向性珪素鋼板の片面にレーザー切れ目(レーザー切れ目付けの具体的なプロセスパラメータは表2に示される)を付けるステップと、
によって製造される。
表4は実施例23~37及び比較例11~15の耐熱磁区細分化型方向性珪素鋼の溝の特徴パラメータを示す。
(1)方向性珪素鋼に対して製鉄、製鋼、熱間圧延プロセスを行い、さらに0.26mmになるまで冷間圧延を1回行うステップと、
(2)冷間圧延板の両面にレーザー切れ目(レーザー切れ目付けの具体的なプロセスパラメータは表5に示される)を付けるステップと、
(3)切れ目を付けた後の冷間圧延板を850℃で脱炭焼鈍し、表面酸化層を形成した後、その表面にMgO分離剤を塗布し、巻き取って鋼ロールを形成するステップと、
(4)1200℃の高温焼鈍条件で20時間維持し、その後、その表面に絶縁コーティングを塗布し、最終焼鈍を行って珪素鋼板を形成するステップと、
によって製造される。
表7は実施例38~54及び比較例16~21の耐熱磁区細分化型方向性珪素鋼の溝の特徴パラメータを示す。
(1)方向性珪素鋼に対して製鉄、製鋼、熱間圧延プロセスを行い、さらに0.226mmになるまで冷間圧延を1回行うステップと、
(2)脱炭焼鈍を行い、鋼板の表面にMgO分離剤を塗布してベーキングし、さらに巻き取って鋼ロールを形成するステップと、
(3)1200℃の高温焼鈍条件で20時間維持し、表面の未反応の残留MgOを洗浄により除去し、冷間圧延板を得るステップと、
(4)冷間圧延板の片面にレーザー切れ目を付け、具体的なプロセスパラメータは表8に示されるステップと、
(5)その表面に絶縁コーティングを塗布し、最終焼鈍を行って珪素鋼板を形成するステップと、
によって製造される。
比較例18では、サブスポットの単一パルス瞬時ピークパワー密度の最大値と最小値との比が本発明の限定範囲外であるため、磁気特性が比較的悪く、積層係数も比較的悪く、
比較例19、20では、サブスポットの直径とサブスポットのフォーカスセンター間の間隔との比が本発明の限定範囲外であるため、比較例19のP17/50が比較的悪く、比較例20のP17/50及び積層係数が比較的悪く、
比較例21では、複数のサブスポットのレーザー走査方向における全長さが本発明の限定範囲外であるため、そのP17/50値が悪い。
Claims (6)
- 耐熱磁区細分化型方向性珪素鋼であって、
片面又は両面に、切れ目付け方式により形成された相互に平行な複数の溝を有し、
各溝はいずれも耐熱磁区細分化型方向性珪素鋼の幅方向に延在し、
該相互に平行な複数の溝は耐熱磁区細分化型方向性珪素鋼の圧延方向に沿って均一に分布し、
耐熱磁区細分化型方向性珪素鋼の幅方向に延在する各溝はいずれも耐熱磁区細分化型方向性珪素鋼の幅方向に延在する複数のサブ溝をつなぎ合わせてなり、
各サブ溝の耐熱磁区細分化型方向性珪素鋼の幅方向における横断面形状は逆台形であり、前記台形の長辺の長さはLtであり、前記台形の斜辺の耐熱磁区細分化型方向性珪素鋼の幅方向における投影長さl e は8mmを超えず、
各溝をつなぎ合わせにより形成する複数のサブ溝のうち、隣接する2つのサブ溝の相互間の横方向間隔l b は10mmを超えず、
前記台形の長辺の長さLt、前記台形の斜辺の耐熱磁区細分化型方向性珪素鋼の幅方向における投影長さle及び横方向間隔lbはさらに、(le+lb)/Lt≦0.2の関係を満たし、
前記台形の高さmは5~60μmであり、
圧延方向において隣接する溝間の間隔dは2~10mmであり、
各溝をつなぎ合わせにより形成する複数のサブ溝について、耐熱磁区細分化型方向性珪素鋼の圧延方向のずれ間隔d 0 は溝間の間隔dの0.4倍を超えない、
ことを特徴とする耐熱磁区細分化型方向性珪素鋼。 - 前記切れ目付け方式は、レーザー切れ目付け、電気化学的切れ目付け、歯付きローラ切れ目付け及び高圧水ビーム切れ目付けのうちの少なくとも1つを含むことを特徴とする請求項1に記載の耐熱磁区細分化型方向性珪素鋼。
- 前記切れ目付け方式はレーザー切れ目付けであることを特徴とする請求項1又は2に記載の耐熱磁区細分化型方向性珪素鋼。
- レーザー切れ目付け方式によって、耐熱磁区細分化型方向性珪素鋼の片面又は両面に前記溝を形成し、レーザー切れ目付け用のレーザービームが分光器により複数のサブビームに分けられ、該複数のサブビームによって、各溝をつなぎ合わせにより形成する複数の前記サブ溝を形成するステップを含み、
耐熱磁区細分化型方向性珪素鋼の表面に単一の前記サブビームで形成されたサブスポットの単一パルス瞬時ピークパワー密度は5.0×10 5 W/mm 2 ~5.0×10 11 W/mm 2 であり、
前記サブスポットの単一パルス瞬時最大ピークパワー密度と最小ピークパワー密度との比は20を超えず、
前記サブスポットのフォーカスセンター間の間隔に対するサブスポットの直径の比は0.1~0.8の範囲内にあり、
耐熱磁区細分化型方向性珪素鋼の表面に前記複数のサブビームで形成された複数のサブスポットのレーザー走査方向における全長さは20mm以下である、
ことを特徴とする請求項3に記載の耐熱性磁区細分化型方向性珪素鋼の製造方法。 - レーザー切れ目付け用のレーザー発生ポンプ源はCO2レーザー装置、固体レーザー装置、ファイバーレーザー装置のうちの少なくとも1つから選択されることを特徴とする請求項4に記載の製造方法。
- レーザー切れ目付けステップは耐熱磁区細分化型方向性珪素鋼の脱炭焼鈍ステップの前又は後、或いは耐熱磁区細分化型方向性珪素鋼の熱延伸平坦化焼鈍ステップの前又は後に行われることを特徴とする請求項4に記載の製造方法。
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