JP6236466B2 - 鉄損に優れた方向性電磁鋼板及びその製造方法 - Google Patents
鉄損に優れた方向性電磁鋼板及びその製造方法 Download PDFInfo
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Description
Wec=(π2・d2・I2・f2)/(ρ・6)
(Wec:鉄損、d:結晶直径、I:電流、f:周波数、ρ:比抵抗)
Cは、脱炭負荷等の問題によって、スラブ状態では多量含まれることができるが、電磁鋼板の磁気時効の原因となるため、最終製品である電磁鋼板ではできるだけその含量が制限されることが好ましい。したがって、本発明では、上記C含量の上限を0.003質量%に制限する。上述したように、本発明において、上記Cは、最終製品である電磁鋼板内には添加されないことが好ましい不純物であるため、その含量の下限が特に限定されない。
Mnは、再加熱時に析出物の固溶温度を低くし、熱間圧延時に素材の両端部に生成されるクラックを防止する役割をする元素であり、このような作用効果を得るためには0.03%以上添加される必要がある。しかしながら、過剰に添加される場合は、Mn酸化物を形成し、MnS化合物を形成して希土類元素の役割を縮小するため、鉄損を悪化させる。したがって、その含量範囲を0.03〜0.2質量%に設定することが好ましい。
Sは、希土類元素と結合してインヒビターを生成させることができる元素であり、このためには0.001質量%以上添加される必要がある。但し、過多に添加される場合は、形成されるS化合物が粗大化するため、1次再結晶粒の成長を抑制するためのインヒビターとして作用するのが困難である。したがって、その上限を0.05質量%とする。
一部の電磁鋼板では、上記Nがインヒビターの役割を行うことができる。しかしながら、本発明では、窒化物系インヒビターを積極的に用いないため、上記Nを積極的に添加しない。また、Nが多量に添加される場合は、鋼にブリスターと呼ばれる膨れ現象をもたらす可能性がある。したがって、本発明では、上記Nを0.01質量%以下に制限する。
元素のうちC、Mn、S、Nの含量をそれぞれC:0.05質量%、Mn:0.07質量%、S:0.007質量%、N:0.006質量%に固定し、Si、Al及び希土類元素の含量(表において各元素の含量は質量%を意味する。)を下記表1に記載されているように変更して溶鋼を製造した。溶鋼の製造時、希土類元素の場合は、それぞれの金属を個別に添加するか又はミッシュメタルの形で添加してその組成を調整した。上述した組成の溶鋼を鋳造して厚さ250mmのスラブを得て、スラブを1150℃の温度に加熱した後、2.3mmの厚さで熱間圧延した。上記熱間圧延された熱延板を1100℃の温度に加熱する熱延板焼鈍を行った後、加熱された鋼板を冷却し酸洗した。上記酸洗された熱延板を1回の冷間圧延によって0.27mmまで冷間圧延して冷延板を得た。上記冷延板を、水素と窒素が混合された湿潤雰囲気で830℃の温度に加熱して1次再結晶と脱炭焼鈍を行い、残炭量を30ppm以下とした。次いで、上記脱炭焼鈍された鋼板を15℃/hrの昇温速度で1200℃まで加熱して2次再結晶させた後、冷却によって多様な条件の電磁鋼板を得た。下記表1において、B8は磁束密度、W17/50は鉄損を示す。
また、添加された希土類元素がどのようにインヒビターとして作用しているかを確認するために、C:0.05質量%、Mn:0.07質量%、S:0.007質量%、N:0.006質量%、Si:3.1質量%、Al:1.5質量%に調整し、希土類元素のうちPrの含量を0.08質量%(a)に制御したか又はミッシュメタルを添加して全希土類元素含量を0.24質量%(発明鋼3)に制御した電磁鋼板のスラブを上述した実施例1と同じ過程により熱間圧延及び冷間圧延し、1次再結晶焼鈍した1次再結晶板内のインヒビターの生成状態をレプリカ法を用いて透過電子顕微鏡で観察した写真を図1に示した。
また、スラブ組成において、全ての希土類元素の含量の和を変更し、且つC:0.05質量%、Mn:0.07質量%、S:0.007質量%、N:0.006質量%に調整し、Si:3.1質量%、Al:1.0質量%に制御した場合(a)、及びSi:3.1%、Al:2.0%に制御して上記実施例1と同一に電磁鋼板を製造した場合(b)の、全ての希土類元素の含量の合計による鉄損の変化量を図2に示した。図面を参照すると、希土類元素の含量が本発明の範囲に該当する場合は鉄損が急激に減少することが確認できる。
Claims (8)
- 質量%で、Si:1.0〜4.0%、Al:0.1〜4.0%、単独で又はOもしくはSとの化合物の形で存在する希土類元素:全ての希土類元素の含量の合計で0.05〜0.5%、C:0.003%以下、Mn:0.03〜0.2%、S:0.001〜0.05%、N:0.01%以下、残部鉄、及び不可避的不純物からなる組成を有する、鉄損に優れた方向性電磁鋼板。
- 質量%で、P:0.5%以下、Sn:0.3%以下、Sb:0.3%以下、Cr:0.3%以下、Cu:0.4%以下及びNi:1%以下のうちから選択される1種又は2種以上をさらに含む、請求項1に記載の鉄損に優れた方向性電磁鋼板。
- 質量%で、Si:1.0〜4.0%、Al:0.1〜4.0%、単独で又はOもしくはSとの化合物の形で存在する希土類元素:全ての希土類元素の含量の合計で0.05〜0.5%、C:0.01〜0.1%、Mn:0.03〜0.2%、S:0.001〜0.05%、N:0.01%以下、残部鉄、及び不可避的不純物からなる組成を有するスラブを1050〜1300℃に加熱する段階と、
前記スラブを熱間圧延する段階と、
前記スラブを冷間圧延する段階と、
前記スラブを1次再結晶焼鈍する段階と、
前記スラブを2次再結晶焼鈍する段階と、
をこの順で含み、
インヒビターとして単独で又はOもしくはSと結合した化合物の形の希土類元素を用いる、鉄損に優れた方向性電磁鋼板の製造方法であって、
前記鋼板のC含量は質量%で0.003%以下である、
製造方法。 - 前記熱間圧延する段階の後に熱間圧延された鋼板を焼鈍する段階及び酸洗する段階のうちから選択された一つ以上の段階をさらに含む、請求項3に記載の鉄損に優れた方向性電磁鋼板の製造方法。
- 前記冷間圧延する段階の圧下率は85〜90%である、請求項3に記載の鉄損に優れた方向性電磁鋼板の製造方法。
- 前記冷間圧延は、中間焼鈍を挟んで2回以上行われ、最終回の冷間圧延の圧下率が50%以上である、請求項5に記載の鉄損に優れた方向性電磁鋼板の製造方法。
- 前記1次再結晶焼鈍は700〜950℃で行われる、請求項3に記載の鉄損に優れた方向性電磁鋼板の製造方法。
- 前記2次再結晶焼鈍は、最高温度1100〜1300℃まで昇温速度5〜30℃/hrで加熱する過程により行われる、請求項3に記載の鉄損に優れた方向性電磁鋼板の製造方法。
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JP (1) | JP6236466B2 (ja) |
KR (1) | KR101482354B1 (ja) |
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KR101647655B1 (ko) * | 2014-12-15 | 2016-08-11 | 주식회사 포스코 | 방향성 전기강판 및 그 제조방법 |
KR101707451B1 (ko) * | 2015-12-22 | 2017-02-16 | 주식회사 포스코 | 방향성 전기강판 및 그 제조방법 |
KR102177523B1 (ko) * | 2015-12-22 | 2020-11-11 | 주식회사 포스코 | 방향성 전기강판 및 그 제조방법 |
KR101697988B1 (ko) * | 2015-12-22 | 2017-01-19 | 주식회사 포스코 | 방향성 전기강판 및 이의 제조방법 |
KR101884428B1 (ko) * | 2016-10-26 | 2018-08-01 | 주식회사 포스코 | 방향성 전기강판 및 이의 제조방법 |
KR101919521B1 (ko) * | 2016-12-22 | 2018-11-16 | 주식회사 포스코 | 방향성 전기강판 및 이의 제조방법 |
US11053574B2 (en) | 2017-01-16 | 2021-07-06 | Nippon Steel Corporation | Non-oriented electrical steel sheet |
TWI646202B (zh) * | 2017-07-13 | 2019-01-01 | 中國鋼鐵股份有限公司 | 鐵損動態調整方法與軋延系統 |
CN117206324B (zh) * | 2023-11-07 | 2024-02-27 | 内蒙古丰洲材料有限公司 | 一种稀土低温Hi-B钢热轧卷的生产方法 |
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JPS5413846B2 (ja) * | 1973-06-18 | 1979-06-02 | ||
JPS60141830A (ja) * | 1983-12-29 | 1985-07-26 | Kawasaki Steel Corp | 一方向性珪素鋼板の製造方法 |
KR20020044244A (ko) * | 2000-12-05 | 2002-06-15 | 이구택 | 방향성 전기강판의 제조방법 |
KR20020044243A (ko) * | 2000-12-05 | 2002-06-15 | 이구택 | 자기특성이 우수한 방향성 전기강판의 제조방법 |
WO2004099457A1 (ja) * | 2003-05-06 | 2004-11-18 | Nippon Steel Corporation | 鉄損に優れた無方向性電磁鋼板及びその製造方法 |
JP4280197B2 (ja) | 2003-05-06 | 2009-06-17 | 新日本製鐵株式会社 | 無方向性電磁鋼板およびその製造方法 |
JP2005264280A (ja) | 2004-03-22 | 2005-09-29 | Jfe Steel Kk | 打ち抜き性及び耐被膜剥離性に優れた方向性電磁鋼板及びその製造方法 |
JP4979904B2 (ja) * | 2005-07-28 | 2012-07-18 | 新日本製鐵株式会社 | 電磁鋼板の製造方法 |
US7942982B2 (en) | 2006-11-22 | 2011-05-17 | Nippon Steel Corporation | Grain-oriented electrical steel sheet excellent in coating adhesion and method of producing the same |
JP5098430B2 (ja) | 2007-05-17 | 2012-12-12 | 新日鐵住金株式会社 | 打ち抜き加工性と鉄損に優れた無方向性電磁鋼板および製造方法 |
JP5423616B2 (ja) * | 2009-09-14 | 2014-02-19 | 新日鐵住金株式会社 | 磁気特性に優れた無方向性電磁鋼板の製造方法および無方向性電磁鋼板製造用の鋳造鋼帯の製造方法 |
KR101301440B1 (ko) * | 2009-12-03 | 2013-08-28 | 주식회사 포스코 | 내리징성 및 성형성이 우수한 페라이트계 스테인리스강판 제조방법 |
WO2011114178A1 (en) * | 2010-03-19 | 2011-09-22 | Arcelormittal Investigación Y Desarrollo Sl | Process for the production of grain oriented electrical steel |
CN102383045A (zh) * | 2011-11-02 | 2012-03-21 | 江苏昊达有限责任公司 | 一种电机用硅钢的制备方法 |
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CN104937123A (zh) | 2015-09-23 |
KR20140084770A (ko) | 2014-07-07 |
KR101482354B1 (ko) | 2015-01-13 |
WO2014104444A1 (ko) | 2014-07-03 |
US20150340137A1 (en) | 2015-11-26 |
US10109405B2 (en) | 2018-10-23 |
US20180068769A1 (en) | 2018-03-08 |
JP2016509625A (ja) | 2016-03-31 |
EP2940170A4 (en) | 2016-06-15 |
CN104937123B (zh) | 2018-02-02 |
US9847158B2 (en) | 2017-12-19 |
EP2940170A1 (en) | 2015-11-04 |
EP2940170B1 (en) | 2019-04-24 |
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