JP6881580B2 - 方向性電磁鋼板 - Google Patents
方向性電磁鋼板 Download PDFInfo
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- JP6881580B2 JP6881580B2 JP2019529822A JP2019529822A JP6881580B2 JP 6881580 B2 JP6881580 B2 JP 6881580B2 JP 2019529822 A JP2019529822 A JP 2019529822A JP 2019529822 A JP2019529822 A JP 2019529822A JP 6881580 B2 JP6881580 B2 JP 6881580B2
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- JPBBZPSUFPWRMG-BRFYHDHCSA-N C(C1)C1(C1)[C@H]2C1CCC2 Chemical compound C(C1)C1(C1)[C@H]2C1CCC2 JPBBZPSUFPWRMG-BRFYHDHCSA-N 0.000 description 1
- CJTGIVYOBUGHCZ-UHFFFAOYSA-N CCC1C(C2)CC2CNC1 Chemical compound CCC1C(C2)CC2CNC1 CJTGIVYOBUGHCZ-UHFFFAOYSA-N 0.000 description 1
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Description
本願は、2017年07月13日に、日本に出願された特願2017−137433号に基づき優先権を主張し、その内容をここに援用する。
このような課題に対し、これまで、フォルステライト系被膜の形成を抑制し、鋼板表面を平滑化する技術が提案されている。
本発明者らは、フォルステライト系被膜がなく、鋼板表面を平滑化した方向性電磁鋼板の表面に張力絶縁被膜を形成する際、優れた被膜密着性を確保するためには、張力絶縁被膜の焼付工程において、鋼板と張力絶縁被膜の密着を担う密着層として寄与する、SiO2を含む酸化物被膜、特に非晶質のSiO2を含む被膜、より好ましくは実質的に非晶質のSiO2からなる被膜を形成させることが重要であると考えた。ここで、非晶質とは、原子や分子が規則正しい空間格子を作らないで、乱れた配列をしている固体である。具体的には、X線回折を行った際に、ハローのみが検出され、特定のピークが検出されない状態を示す。本実施形態に係る方向性電磁鋼板では、酸化物被膜は、実質的に非晶質のSiO2のみからなることが好ましい。
このSiO2を含む酸化物被膜を有する鋼板の表面(具体的には、酸化物被膜の表面)に、リン酸塩、クロム酸、コロイダルシリカを主体とする塗布液を塗布し、窒素3〜97%、水素3〜97%、露点−30〜30℃の雰囲気中、850℃で100秒焼き付けてクロム化合物を含む張力絶縁被膜を形成し、該被膜の被膜密着性を調査した。
クロム化合物を含まないと耐食性が大きく低下するので、本実施形態に係る電磁鋼板では、張力絶縁被膜は、クロム化合物を含む張力絶縁被膜とした。クロム化合物は、少しでも含まれていればその効果は得られるが、1.0g/m2以上であることが好ましい。
絶縁被膜及び酸化物被膜における、SiのSiO2換算での付着量は上述したFe量の測定と同様の方法で、ICP(Inductively Coupled Plasma)高周波誘導結合プラズマ発光分光分析法で求めることができる。
張力絶縁被膜に比べ、酸化物被膜は薄い(〜数nm)ので、絶縁被膜及び酸化物被膜における、Fe量や、SiのSiO2換算での付着量は、絶縁被膜における、Fe量やSiのSiO2換算での付着量に近い。
次に、本実施形態に係る電磁鋼板の化学組成(成分組成)について説明する。以下、化学組成に係る%は質量%を意味する。
Cは、磁気時効によって鉄損を著しく増大させる元素である。C含有量が0.085%を超えると、鉄損の増大が著しくなるので、C含有量は0.085%以下とする。含有量は、好ましくは0.010%以下、より好ましくは0.005%以下である。Cは少量ほど、鉄損の低減にとって好ましいので、下限は特に限定しないが、0.0001%程度が検出限界であるので、0.0001%が実質的な下限である。
Siは、二次再結晶焼鈍において二次再結晶を制御し、磁気特性の向上に寄与する元素である。Si含有量が0.80%未満であると、二次再結晶焼鈍において鋼板が相変態し、二次再結晶を制御することが困難になり、良好な磁束密度及び鉄損特性が得られない。そのため、Si含有量は0.80%以上とする。好ましくは2.50%以上、より好ましくは3.00%である。
Mn含有量が1.00%を超えると、二次再結晶焼鈍において鋼板が相変態し、良好な磁束密度及び鉄損特性が得られない。そのため、Mn含有量は1.00%以下とする。好ましくは0.70%以下、より好ましくは0.50%以下である。
酸可溶性Al含有量が0.065%を超えると、AlNの析出が不均一になり、所要の二次再結晶組織が得られず、磁束密度が低下し、また、鋼板が脆化する。そのため、酸可溶性Al含有量は0.065%以下とする。好ましくは0.060%以下、より好ましくは0.050%以下である。
Sは、Mnと結合して、インヒビターとして機能するMnSを形成する元素である。S含有量が0.013%を超えると、微細な硫化物が生成し、鉄損特性が低下する。そのため、S含有量は0.013%以下とする。好ましくは0.010%以下、より好ましくは0.007%以下である。
Cuは、Sと結合し、インヒビターとして機能するCuSを形成する元素である。Cu含有量が0.01%未満であると、効果が十分に発現しないので、Cu含有量は0.01%以上とする。好ましくは0.04%以上、より好ましくは0.07%以上である。
Nは、Alと結合して、インヒビターとしての機能するAlNを形成する元素である。N含有量が0.001%未満では、AlNの形成が不十分となるので、N含有量は0.001%以上が好ましい。より好ましくは0.006%以上である。
Pは、鋼板の比抵抗を高めて、鉄損の低減に寄与する元素である。下限は0%を含むが、効果を確実に得る点で、0.02%以上が好ましい。
一方、P含有量が0.50%を超えると、圧延性が低下する。そのため、P含有量は0.50%以下が好ましい。より好ましくは0.35%以下である。
Niは、鋼板の比抵抗を高めて、鉄損の低減に寄与するとともに、熱延鋼板の金属組織を制御し、磁気特性の向上に寄与する元素である。下限は0%を含むが、効果を確実に得る点で、Ni含有量は0.02%以上が好ましい。Ni含有量が1.00%を超えると、二次再結晶が不安定に進行するので、Niは1.00%以下が好ましい。より好ましくは0.75%以下である。
Sb:0〜0.30%
Sn及びSbは、結晶粒界に偏析し、仕上げ焼鈍時、焼鈍分離剤が放出する水分でAlが酸化される(この酸化で、コイル位置でインヒビター強度が異なり、磁気特性が変動する)のを防止する作用をなす元素である。下限は0%を含むが、効果を確実に得る点で、いずれの元素も含有量を0.02%以上とすることが好ましい。
次に、本実施形態に係る電磁鋼板の製造方法について説明する。
仕上げ焼鈍後に、スクラバーを用いて、余分な焼鈍分離剤を除去するとともに、鋼板の表面状態を制御する。余分な焼鈍分離剤の除去を行う場合、スクラバーによる処理とともに、水洗を行うことが好ましい。
スクラバーは、ブラシの圧下量が1.0mm〜5.0mmとなるように制御することが好ましい。
ブラシの圧下量が、1.0mm未満であると、余剰の焼鈍分離剤を十分に除去することができず、被膜密着性が低下するので好ましくない。また、ブラシの圧下量が5.0mm超となると鋼板表面が必要以上に削られて表面活性が高まり、鉄の溶出量が過大となり、被膜中のFe量が過剰になって、被膜密着性が低下するので、好ましくない。
酸素分圧が0.005超では、非晶質酸化膜以外の鉄系酸化物も形成され、被膜密着性が低下する。となる。また、保持温度が600℃未満では、非晶質酸化物が十分に生成しない。また、1150℃超では設備負荷が高くなるので好ましくない。
表1に示す成分組成の珪素鋼を1100℃に加熱して熱間圧延に供し、板厚2.6mmの熱延鋼板とした。この熱延鋼板に1100℃で焼鈍を施した後、一回の冷間圧延又は中間焼鈍を挟む複数回の冷間圧延を施して最終板厚0.23mmの冷延鋼板とした。
具体的には、被膜が形成されたそれぞれの鋼No.製造条件No.の組み合わせにおいても、鋼板断面をFIB(Focused Ion Beam)加工し、透過電子顕微鏡(TEM)にて10μm×10μmの範囲を観察した。その結果、被膜がSiO2からなっていることを確認した。また、表面をフーリエ変換赤外分光法(FT−IR)で分析したところ、波数1250(cm-1)の位置にピークが存在した。このピークは、SiO2由来のピークであるので、このことからも、被膜がSiO2で形成されていることが確認できた。また、被膜を有する鋼板に対し、X線回折を行った際に、地鉄のピークを除けばハローのみが検出され、特定のピークが検出されなかった。
すなわち、いずれも形成された被膜は、SiO2からなる非晶質酸化物被膜であった。
また、コーティング液の配合比率を調整し、張力絶縁被膜におけるSiのSiO2換算での付着量を全付着量の50%未満とした。
Claims (2)
- 鋼板と、
前記鋼板上に形成されたSiO2 からなる非晶質酸化物被膜と、
前記非晶質酸化物被膜上に形成された張力絶縁被膜と、
を有し、
前記鋼板が、化学組成として、質量%で、
C:0.085%以下、
Si:0.80〜7.00%、
Mn:1.00%以下、
酸可溶性Al:0.065%以下、
S:0.013%以下、
Cu:0〜0.80%、
N:0〜0.012%、
P:0〜0.50%、
Ni:0〜1.00%、
Sn:0〜0.30%、
Sb:0〜0.30%、
を含み、
残部Fe及び不純物からなる、
方向性電磁鋼板であって、
前記張力絶縁被膜が、クロム化合物を含み、
前記非晶質酸化物被膜及び前記張力絶縁被膜中のFe量が70mg/m2以上、250mg/m2以下であり、
前記方向性電磁鋼板から採取した試験片を、直径30mmの円筒に巻き付けて、180°曲げた後、巻き戻した時、前記鋼板から剥離せず、前記鋼板と密着したままの前記張力絶縁被膜の面積率である被膜残存率が80%以上である
ことを特徴とする方向性電磁鋼板。 - 前記鋼板の前記化学組成が、質量%で、Cu:0.01〜0.80%を含むことを特徴とする請求項1に記載の方向性電磁鋼板。
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