JP7016358B2 - 絶縁被膜付き電磁鋼板およびその製造方法 - Google Patents
絶縁被膜付き電磁鋼板およびその製造方法 Download PDFInfo
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- JP7016358B2 JP7016358B2 JP2019524295A JP2019524295A JP7016358B2 JP 7016358 B2 JP7016358 B2 JP 7016358B2 JP 2019524295 A JP2019524295 A JP 2019524295A JP 2019524295 A JP2019524295 A JP 2019524295A JP 7016358 B2 JP7016358 B2 JP 7016358B2
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- insulating
- coating layer
- tension
- steel sheet
- tension coating
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- 239000010936 titanium Substances 0.000 claims description 17
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- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
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- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
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Description
[1]絶縁張力被膜層Aを含む絶縁被膜を少なくとも片面に有する絶縁被膜付き電磁鋼板であって、前記絶縁張力被膜層Aの目付量をM、前記絶縁張力被膜層Aが鋼板に対して与える張力をσAとしたとき、前記絶縁張力被膜層Aのうち表面から目付量M/2の絶縁張力被膜層が鋼板に与える張力が0.80×σA以上である絶縁被膜付き電磁鋼板。
[2]前記絶縁張力被膜層Aが、ガラスまたはガラスセラミックスを主体とする[1]に記載の絶縁被膜付き電磁鋼板。
[3]前記絶縁張力被膜層Aが、Mg、Al、Ca、Ba、Sr、Zn、Ti、Nd、Mo、Cr、B、Ta、CuおよびMnのうちから選ばれる1種以上の元素を含む珪リン酸塩ガラスまたは珪リン酸塩ガラスセラミックスである[1]または[2]に記載の絶縁被膜付き電磁鋼板。
[4]絶縁張力被膜層Aを含む絶縁被膜を少なくとも片面に有する絶縁被膜付き電磁鋼板の製造方法であって、前記絶縁張力被膜層Aの目付量をM、前記絶縁張力被膜層Aが鋼板に対して与える張力をσAとしたとき、前記絶縁張力被膜層Aのうち表面から目付量M/2の絶縁張力被膜層が鋼板に与える張力が0.80×σA以上であり、前記絶縁張力被膜層Aを、リン酸、ホウ酸およびケイ酸のMg、Al、Ca、Ba、Sr、Zn、Ti、Nd、Mo、Cr、Ta、Cu、Mnの塩のうちから選ばれる少なくとも1種と、コロイド状シリカと、を含む被膜形成用処理液を、電磁鋼板の少なくとも一方の表面に塗布し、前記塗布後、600℃以上700℃以下の温度域を100℃/秒以上の加熱速度で加熱したのち、800℃以上で焼付けて形成する、絶縁被膜付き電磁鋼板の製造方法。
[5]絶縁張力被膜層Aを含む絶縁被膜を少なくとも片面に有する絶縁被膜付き電磁鋼板の製造方法であって、前記絶縁張力被膜層Aの目付量をM、前記絶縁張力被膜層Aが鋼板に対して与える張力をσAとしたとき、前記絶縁張力被膜層Aのうち表面から目付量M/2の絶縁張力被膜層が鋼板に与える張力が0.80×σA以上であり、前記絶縁張力被膜層Aを、リン酸のMg、Al、Ca、Ba、Sr、Zn、Cr、Mnの塩のうちから選ばれる少なくとも1種と、コロイド状シリカと、Ti、Nd、Mo、B、Ta、Cuのうちから選ばれる1種もしくは2種以上を含む化合物と、を含む被膜形成用処理液を、電磁鋼板の少なくとも一方の表面に塗布し、前記塗布後、600℃以上700℃以下の温度域を100℃/秒以上の加熱速度で加熱したのち、800℃以上で焼付けて形成する、絶縁被膜付き電磁鋼板の製造方法。
[6]700℃以上の温度域での雰囲気を、水蒸気露点:-20℃以上10℃以下の雰囲気とする[4]または[5]に記載の絶縁被膜付き電磁鋼板の製造方法
公知の方法で製造された板厚:0.23mmの仕上焼鈍済みの方向性電磁鋼板を300mm×100mmの大きさにせん断し、未反応の焼鈍分離剤を除去した後、歪取焼鈍(800℃、2時間、N2雰囲気)を施した。歪取焼鈍後の前記鋼板の表面にはフォルステライトを主体とする被膜(絶縁被膜層B)が形成していた。次に、5質量%リン酸水溶液で軽酸洗した。その後、前記軽酸洗後の鋼板に対して、以下のようにして絶縁被膜を形成した。
(従来例2)特許文献4の発明例である実施例1第2表のNo.3の絶縁張力被膜を前記特許文献4に記載のとおり施し、絶縁被膜層B(フォルステライト被膜)の上に、前記絶縁張力被膜(絶縁張力被膜層A)を形成した。
(発明例)第一リン酸マグネシウム水溶液を固形分換算で100質量部、コロイド状シリカを固形分換算で50質量部、硝酸マグネシウム6水和物を50質量部混合した水溶液を純水で希釈して比重1.20に調整した被膜形成用処理液を乾燥後目付け量が両面で9.00g/m2(片面で4.50g/m2)となるようにロールコーターにて塗布した。次に、乾燥炉に装入し(300℃、1分間)、その後、600℃~700℃の温度域を150℃/秒の加熱速度で加熱した後、850℃、30秒間、N2:100%、水蒸気露点:-10℃の条件で焼付を実施して、絶縁被膜層B(フォルステライト被膜)の上に絶縁張力被膜層Aを形成した。
ただし、鋼板ヤング率は、132GPaとする。
また、このように絶縁張力被膜層A内で鋼板への付与張力に傾斜がある発明例では絶縁張力被膜層A全体で11.3MPaと従来例(従来例1:10.5MPa、従来例2:7.8MPa)よりも良好な張力を示すとともに、被膜密着性も良好であることがわかる。
Cはゴス方位結晶粒の発生に有用な成分であり、かかる作用を有効に発揮させるためには、0.001%以上のCを含有することが好ましい。一方、C含有量が0.10%を超えると脱炭焼鈍によっても脱炭不良を起こすおそれがある。そのためC含有量は0.001~0.10%の範囲が好ましい。
Siは、電気抵抗を高めて鉄損を低下させるとともに、鉄のBCC組織を安定化させて高温の熱処理を可能とするために必要な成分であり、少なくとも1.0%含有することが好ましい。一方、Siの含有量が5.0%を超えると冷間圧延が困難となるおそれがある。したがって、Si含有量は1.0~5.0%の範囲が好ましい。Si含有量は、2.0~5.0%の範囲がより好ましい。
Mnは、鋼の熱間脆性の改善に有効に寄与するだけでなく、SやSeが混在している場合には、MnSやMnSe等の析出物を形成し結晶粒成長の抑制剤としての機能を発揮する。Mnの含有量が0.01%より少ないと上記の効果が不十分であり、一方、1.0%を超えるとMnSe等の析出物の粒径が粗大化してインヒビターとしての効果が失われるおそれがある。そのため、Mn含有量は0.01~1.0%の範囲が好ましい。
Alは、鋼中でAlNを形成して分散第二相としてインヒビターの作用をする有用成分であるが、添加量が0.003%に満たないと十分に析出量が確保できないおそれがあり、一方、0.050%を超えて添加するとAlNが粗大に析出してインヒビターとしての作用が失われるおそれがある。そのため、Al含有量は、sol.Alとして0.003~0.050%の範囲が好ましい。
NもAlと同様にAlNを形成するために必要な成分である。添加量が0.001%を下回るとAlNの析出が不十分となるおそれがあり、0.020%を超えて添加するとスラブ加熱時にふくれ等を生じるおそれがある。そのため、N含有量は0.001~0.020%の範囲が好ましい。
S又はSeは、MnやCuと結合してMnSe、MnS、Cu2-xSe、Cu2-xSを形成し鋼中の分散第二相としてインヒビターの作用を発揮する有用成分である。これらS、Seの合計の含有量が0.001%に満たないとその添加効果に乏しく、一方、0.05%を超える場合はスラブ加熱時の固溶が不完全となるだけでなく、製品表面の欠陥の原因ともなるおそれがある。そのため、S及びSeのうちから選んだ1種又は2種の含有量は、S又はSeの単独添加、複合添加(SとSeを併用)いずれの場合も合計で0.001~0.05%の範囲が好ましい。
ただし、鋼板ヤング率は、132GPaとする。
質量%で、Si:3.25%、C:0.04%、Mn:0.08%、S:0.002%、sol.Al:0.015%、N:0.006%、Cu:0.05%、Sb:0.01%を含有する珪素鋼板スラブを1150℃、20分加熱後、熱間圧延して2.4mmの板厚の熱延板とし、1000℃、1分間の焼鈍を施した後、冷間圧延により0.27mmの最終板厚とし、得られた冷間圧延コイルの中央部から、100mm×400mmサイズの試料を採取し、室温から820℃まで加熱速度80℃/sにて昇温し、湿潤雰囲気下で820℃、60秒の一次再結晶焼鈍をおこなった。引き続きMgO:100質量部に対してTiO2を5質量部混合した焼鈍分離剤を水スラリ状にしてから塗布、乾燥した。この鋼板を300℃から800℃間を100時間かけて昇温させた後、1200℃まで50℃/hrで昇温させ、1200℃で5時間焼鈍する最終仕上げ焼鈍を行いフォルステライトを主体とする下地被膜をもつ鋼板を準備した。
質量%で、Si:3.25%、C:0.04%、Mn:0.08%、S:0.002%、sol.Al:0.015%、N:0.006%、Cu:0.05%、Sb:0.01%を含有する珪素鋼板スラブを1150℃、20分加熱後、熱間圧延して2.2mmの板厚の熱延板とし、1000℃、1分間の焼鈍を施した後、冷間圧延により0.23mmの最終板厚とし、引き続いて室温から820℃まで加熱速度50℃/sにて昇温し、湿潤雰囲気下で820℃、60秒の一次再結晶焼鈍をおこなった。その後MgO:50質量部に対してAl2O3を150質量部、Na2B4O7・10H2Oを1質量部混合した焼鈍分離剤を水スラリ状にしてから塗布、乾燥した。この鋼板を300℃から800℃間を100時間かけて昇温させた後、1200℃まで50℃/hrで昇温させ、1200℃で5時間焼鈍する最終仕上げ焼鈍を行いコーディエライト(2MgO・2Al2O3・5SiO2)を主体とする結晶質の被膜をもつ鋼板を準備した。
Claims (6)
- 絶縁張力被膜層Aを含む絶縁被膜を少なくとも片面に有する絶縁被膜付き電磁鋼板であって、
前記絶縁張力被膜層Aの目付量をM、前記絶縁張力被膜層Aが鋼板に対して与える張力をσAとしたとき、
前記絶縁張力被膜層Aのうち表面から目付量M/2の絶縁張力被膜層が鋼板に与える張力が0.80×σA以上である絶縁被膜付き電磁鋼板。 - 前記絶縁張力被膜層Aが、ガラスまたはガラスセラミックスを主体とする請求項1に記載の絶縁被膜付き電磁鋼板。
- 前記絶縁張力被膜層Aが、Mg、Al、Ca、Ba、Sr、Zn、Ti、Nd、Mo、Cr、B、Ta、CuおよびMnのうちから選ばれる1種以上の元素を含む珪リン酸塩ガラスまたは珪リン酸塩ガラスセラミックスである請求項1または2に記載の絶縁被膜付き電磁鋼板。
- 絶縁張力被膜層Aを含む絶縁被膜を少なくとも片面に有する絶縁被膜付き電磁鋼板の製造方法であって、
前記絶縁張力被膜層Aの目付量をM、前記絶縁張力被膜層Aが鋼板に対して与える張力をσAとしたとき、
前記絶縁張力被膜層Aのうち表面から目付量M/2の絶縁張力被膜層が鋼板に与える張力が0.80×σA以上であり、
前記絶縁張力被膜層Aを、リン酸、ホウ酸およびケイ酸のMg、Al、Ca、Ba、Sr、Zn、Ti、Nd、Mo、Cr、Ta、Cu、Mnの塩のうちから選ばれる少なくとも1種と、コロイド状シリカと、を含み、結晶核生成温度が600℃~700℃となる組成の被膜形成用処理液を、電磁鋼板の少なくとも一方の表面に塗布し、前記塗布後、600℃以上700℃以下の温度域を100℃/秒以上の加熱速度で加熱したのち、800℃以上で焼付けて形成し、700℃以上の温度域での雰囲気を、水蒸気露点:-25℃以上の雰囲気とする、絶縁被膜付き電磁鋼板の製造方法。 - 絶縁張力被膜層Aを含む絶縁被膜を少なくとも片面に有する絶縁被膜付き電磁鋼板の製造方法であって、
前記絶縁張力被膜層Aの目付量をM、前記絶縁張力被膜層Aが鋼板に対して与える張力をσAとしたとき、
前記絶縁張力被膜層Aのうち表面から目付量M/2の絶縁張力被膜層が鋼板に与える張力が0.80×σA以上であり、
前記絶縁張力被膜層Aを、リン酸のMg、Al、Ca、Ba、Sr、Zn、Cr、Mnの塩のうちから選ばれる少なくとも1種と、コロイド状シリカと、Ti、Nd、Mo、B、Ta、Cuのうちから選ばれる1種もしくは2種以上を含む化合物と、を含み、結晶核生成温度が600℃~700℃となる組成の被膜形成用処理液を、電磁鋼板の少なくとも一方の表面に塗布し、前記塗布後、600℃以上700℃以下の温度域を100℃/秒以上の加熱速度で加熱したのち、800℃以上で焼付けて形成し、700℃以上の温度域での雰囲気を、水蒸気露点:-25℃以上の雰囲気とする、絶縁被膜付き電磁鋼板の製造方法。 - 700℃以上の温度域での雰囲気を、水蒸気露点:-20℃以上10℃以下の雰囲気とする請求項4または5に記載の絶縁被膜付き電磁鋼板の製造方法。
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WO2017057513A1 (ja) | 2015-09-29 | 2017-04-06 | 新日鐵住金株式会社 | 方向性電磁鋼板、及び方向性電磁鋼板の製造方法 |
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US11923115B2 (en) | 2024-03-05 |
RU2749507C1 (ru) | 2021-06-11 |
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KR20200105907A (ko) | 2020-09-09 |
CN111684106B (zh) | 2022-06-07 |
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EP3722460A4 (en) | 2020-11-11 |
CN111684106A (zh) | 2020-09-18 |
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