JP6220891B2 - 方向性電磁鋼板およびその製造方法 - Google Patents
方向性電磁鋼板およびその製造方法 Download PDFInfo
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Description
Snを添加すると2次結晶粒の大きさを減少させるために{110}<001>方位の2次核の数字を増加させることによって鉄損を向上させることができる。またSnは、結晶粒系に偏析を通じて結晶粒成長を抑制することに重要な役割を果たし、これはAlN粒子が粗大化し、Si含有量を増加することによって結晶粒成長を抑制する効果が弱化することを補償する。したがって、結果として、相対的に高いSi含有量を持っても{110}<001>2次再結晶集合組織の成功的な形成が保証される。つまり、{110}<001>2次再結晶構造の完成度を全く弱化させることなくSi含有量を増加させるだけでなく、最終厚さを減少させることができる。このようなSnの含有量は、前述のように、他の成分の含有量を適切に調整した範囲内で0.03〜0.07重量%であることが好ましい。つまり、前述のようにSnの含有量範囲を前記0.03〜0.07重量%に制御する時、従来は予測できなかった不連続的で顕著な鉄損減少効果を確認することができるため、本発明による実施例におけるSnの含有量は前記範囲に限定する。また、Sn含有量が過度な場合には、脆性が増加するという問題もあり得るため、Snを上述した範囲に制御する場合には脆性向上にも効果的である。
Sbは、結晶粒系に偏析して1次再結晶粒の過度な成長を抑制する作用がある。Sbを添加して1次再結晶段階で粒成長を抑制することによって板の厚さ方向に応じた1次再結晶粒の大きさの不均一性を除去し、同時に2次再結晶を安定的に形成させることによって、磁性が一層優れている方向性電磁鋼板を作ることができる。特に、このようなSbの効果は、Sbを0.01〜0.05重量%含有する時、従来の文献では予測できなかった程度に大幅に向上することができる。
Pは、低温加熱方式の方向性電磁鋼板で1次再結晶粒の成長を促進させるため、2次再結晶温度を高めて最終製品で{110}<001>方位の集積度を高める。1次再結晶粒が大き過ぎる場合には2次再結晶が不安定になるが、2次再結晶が発生する限り、2次再結晶温度を高めるために1次再結晶粒が大きい方が磁性に有利である。一方、Pは、1次再結晶された鋼板で{110}<001>方位を有する結晶粒の数を増加させて最終製品の鉄損を低めるだけでなく、1次再結晶板で{111}<112>集合組織を強く発達させて最終製品の{110}<001>集積度を向上させるため、磁束密度も高まる。また、Pは、2次再結晶の焼鈍時に約1000℃の高い温度まで結晶粒系に偏析して析出物の分解を遅滞させて抑制力を補強する作用も有している。このようなPの含有量を0.01〜0.05重量%に制限する場合には、従来の文献では全く予測できなかった顕著な効果を得ることができる。Pの効果が良好に発揮されるためには、0.01重量%以上が必要であり、Pが0.05重量%以上になると1次再結晶粒の大きさがむしろ減少して2次再結晶が不安定になるだけでなく、脆性を増加させて冷間圧延性を阻害するため、本発明による実施例ではPの含有量を前記範囲に限定する。
また、本発明による実施例では、前記の多くの元素を添加する場合以外にも、前記P+0.5Sbの含有量を前述した範囲に制御して鉄損をより向上させた。その理由は、概して前記元素が共に添加されて上昇效果を収めることができ、上昇效果が前記数式範囲を満たす時、他の数値範囲に比べて不連続的に最大化するためである。したがって、本発明による実施例では、それぞれの成分含有量以外にも、前記P+0.5Sbを前記範囲に限定する。
前記冷間圧延された鋼板は、鋼中に含まれている炭素を除去すると同時に、高温焼鈍時に2次再結晶成長を適切に制御する抑制剤(Inhibitor)を生成させるために、アンモニア+水素+窒素の混合ガス雰囲気下で脱炭および窒化焼鈍を経る。この工程の特徴は、湿潤雰囲気下で炉内温度を800〜950℃程度に設定して作業するが、800℃より低い場合には、十分な脱炭焼鈍効果が発生しないだけでなく、結晶粒が微細な状態に維持されて2次再結晶時に好ましくない方位の結晶が成長するおそれがあり、950℃より高い場合には、1次再結晶された結晶粒が過多に成長するおそれがあるため、本発明による実施例における脱炭および窒化焼鈍時の炉内温度は800〜950℃に限定する。
前記反応式(1)のように、SiO2が固体状態のMgOスラリーと反応するに当たり、完全な化学的反応をなすためには、二つの固体の間を連結する触媒の役割の物質が必要であり、フェヤライト(fayalite、Fe2SiO4)がこれを担当する。したがって、従来はSiO2形成量だけでなく、適切なフェヤライト形成が重要であった。
前記化学反応式(2)のように水溶液相に発生した2HClは、素材表面に存在するFeまたはFeOと共に次のような化学反応を起こす。
したがって、通常のガラスレス添加剤が導入された焼鈍分離剤を塗布し、コイル状で作るために700℃下で乾燥する時、すでにFe系の酸化層が生成され、このように生成された物質が高温焼鈍工程を経ながら素材表面に深い根を形成するようになる。
前記化学反応式(4)のように、水溶液でCl基が解離可能なBiCl3またはSbCl3とは異なり、オキシクロリド形態の塩化物の場合、熱的分解のみを通じてCl基が生成され、アンチモンオキシクロリドを水溶液相からスラリー状態に製造した後、塗布、乾燥する過程で粗度と光沢度および窮極的に鉄損減少を阻害し得るFe系酸化物を発生させない。
以降、900℃付近でMgOとSiO2反応により素材の最外郭表面には式(5)によりベースコーティングが形成される。以降、1025〜1100℃付近で素材と酸化層の界面で形成されたFeCl2が分解し始め、このように分解されたCl2ガスが素材の最外郭表面に抜け出ながら上に形成されているベースコーティングを素材から剥離させる。本発明による実施例では、スラリーの製造後、乾燥時にFe系酸化物を生成させずに鉄損減少を阻害しないオキシクロリド形態の塩化物の量を投入されるMgO:100〜200gに対して10〜20gに制限して用いる。もし、前記塩化物の量を10gより少なく投入すれば十分なFeCl2を形成する程度のClを供給することができなくなり、高温焼鈍後に粗度および光沢度を向上させるには限界があり、20gより多く投入すれば焼鈍分離剤の主要成分であるMgOに比べて過多な量によりベースコーティング形成自体を妨害して表面だけでなく、冶金学的に2次再結晶に影響を与えることがあるため、本発明による実施例ではMgO:100〜200gに対して塩化物を10〜20gに限定する。
重量%でSi:3.26%、C:0.055%、Mn:0.12%、Sol.Al:0.026%、N:0.0042%、S:0.0045%、そしてSn、Sb、P含有量を本発明で提案した成分系と通常の方向性電磁鋼板成分系で通常の塩化物が含まれているMgO焼鈍分離剤を塗布した後、粗度と光沢度を測定してベースコーティング形成有無を比較した。ここで光沢度は、グロス(Gloss)光沢度であり、反射角60°で表面に反射された光の量を測定し、鏡面光沢度1000を基準にする。
Claims (8)
- MgO、オキシクロリド物質およびスルフェート系酸化防止剤を含み、
前記オキシクロリド物質は、重量比で、前記MgO:100に対して10〜20の比で含まれ、前記スルフェート系酸化防止剤は、重量比で、前記MgO:100に対して3.5〜5の比で含まれ、
前記オキシクロリド物質は、アンチモンオキシクロリド(SbOCl)であり、前記スルフェート系酸化防止剤は、アンチモン系(Sb 2 (SO 4 ) 3 )である、
焼鈍分離剤。 - 鋼スラブを熱間圧延して熱延鋼板を製造する段階と、
前記熱延鋼板を冷間圧延して冷延鋼板を製造する段階と、
前記冷延鋼板を脱炭焼鈍および窒化焼鈍する段階と、
前記脱炭焼鈍および窒化焼鈍が完了した電磁鋼板に、MgO、オキシクロリド物質およびスルフェート系酸化防止剤を含む焼鈍分離剤、ならびに水を含むガラスレス添加剤を塗布して最終高温焼鈍する段階
とを含む方向性電磁鋼板の製造方法であって、
前記オキシクロリド物質は、重量比で、前記MgO:100に対して10〜20の比で含まれ、前記スルフェート系酸化防止剤は、重量比で、前記MgO:100に対して3.5〜5の比で含まれ、
前記オキシクロリド物質は、アンチモンオキシクロリド(SbOCl)であり、前記スルフェート系酸化防止剤は、アンチモン系(Sb 2 (SO 4 ) 3 )である、
方向性電磁鋼板の製造方法。 - 前記脱炭焼鈍および窒化焼鈍が完了した電磁鋼板の表面に形成されるSiO2の量がFe2SiO4の量の2〜5倍で形成される、請求項2に記載の方向性電磁鋼板の製造方法。
- 前記脱炭および窒化焼鈍工程は、35〜55℃の露点範囲で施される、請求項3に記載の方向性電磁鋼板の製造方法。
- 前記最終高温焼鈍時、700〜950℃の温度範囲では昇温速度を18〜75℃/hrで施し、950〜1200℃の温度範囲では10〜15℃/hrで施す、請求項4に記載の方向性電磁鋼板の製造方法。
- 前記脱炭および窒化焼鈍時の温度は、800〜950℃である、請求項5に記載の方向性電磁鋼板の製造方法。
- 前記ガラスレス添加剤は、5〜8g/m2で塗布する、請求項6に記載の方向性電磁鋼板の製造方法。
- 前記鋼スラブは、重量%で、Sn:0.03〜0.07%、Sb:0.01〜0.05%、P:0.01〜0.05%、残部のFeおよびその他の不可避不純物を含み、P+0.5Sb:0.0370〜0.0630%を満たす、請求項7に記載の方向性電磁鋼板の製造方法。
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CN104884646B (zh) | 2018-02-02 |
EP2940161B1 (en) | 2019-06-19 |
WO2014104762A1 (ko) | 2014-07-03 |
CN104884646A (zh) | 2015-09-02 |
EP2940161A1 (en) | 2015-11-04 |
US10023932B2 (en) | 2018-07-17 |
KR20140092467A (ko) | 2014-07-24 |
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JP2016513358A (ja) | 2016-05-12 |
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