JP6954351B2 - 方向性電磁鋼板 - Google Patents
方向性電磁鋼板 Download PDFInfo
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Description
本願は、2017年7月13日に、日本に出願された特願2017−137417号に基づき優先権を主張し、その内容をここに援用する。
前記母材鋼板は、化学成分として、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+0.406・Seで表されるSeq:0.050%以下を含有し、残部:Fe及び不純物からなる。
X線回折で得られるクリストバライト型リン酸アルミニウムのピークの半値幅であるFWHMが、(i)Co−Kα励起源を用いてX線回折をしたとき、2θ=24.8°に現れるピークの半値幅であるFWHM−Coが2.5degree以下、又は、(ii)Cu−Kα励起源を用いてX線回折をしたとき、2θ=21.3°に現れるピークの半値幅であるFWHM−Cuが2.1degree以下である。
なお、X線回折では、株式会社リガク製のX線回折装置SmartLabを用いた。測定方法としては、斜入射X線回折法を用いた。
結晶子サイズ(Å)=K×λ/(β×cosθ)・・・(1)
次に、母材鋼板の成分組成について説明する。以下、%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が0.085%を超えると、鉄損が著しく増大するので、Cは0.085%以下とする。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ので、Si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%以上である。
Mnは、オーステナイト形成元素であり、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。Mnが0.01%未満であると、熱間圧延時に鋼板が脆化する場合があるので、Mnは0.01%以上であることが好ましい。より好ましくは0.05%以上、さらに好ましくは0.10%以上である。
酸可溶性Alは、Nと結合して、インヒビターとして機能する(Al、Si)Nを生成する元素である。酸可溶性Alが0.010%未満であると、AlNの生成量が少なくなり、二次再結晶が十分に進行しない場合があるので、酸可溶性Alは0.010%以上であることが好ましい。より好ましくは0.015%以上、さらに好ましくは0.020%以上である。
S及び/又はSeは、Mnと結合して、インヒビターとして機能するMnS及び/又はMnSeを形成する元素である。添加量は、SとSeの原子量比を考慮して、Seq=S+0.406・Seで規定する。
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が、冷間圧延時、鋼板中にブリスター(空孔)を形成する元素でもある。Nが0.001%未満であると、AlNの形成が不十分となるので、N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。Pが0.50%を超えると、圧延性が低下するので、Pは0.50%以下が好ましい。より好ましくは0.35%以下である。下限は0%を含むが、添加効果を確実に得る点で、0.02%以上が好ましい。
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。Ni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。下限は0%を含むが、添加効果を確実に得る点で、0.02%以上が好ましい。
Sb:0.30%以下
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。
Cuは、S及び/又はSeと結合し、インヒビターとして機能する析出物を形成する元素である。Cuが0.01%未満であると、添加効果が十分に発現しないので、Cuは0.01%以上が好ましい。より好ましくは0.04%以上である。
本実施形態に係る方向性電磁鋼板は、母材鋼板上に形成され、非晶質のSiO2からなる酸化物被膜を備える。
酸化物被膜は、母材鋼板と張力絶縁被膜とを密着させる機能を有する。
張力絶縁被膜は酸化物被膜上に形成され、燐酸塩とコロイド状シリカ(SiO2)を主体とする溶液を塗布して焼付けて形成されるガラス質の絶縁被膜である。
この張力絶縁被膜により、母材鋼板に高い面張力を付与することができる。
保持温度が800℃未満であると、リン酸アルミニウムの結晶化が十分に進行しないので、保持温度は800℃以上が好ましい。より好ましくは835℃以上である。一方、保持温度が900℃を超えると、リン酸アルミニウムの分解が過多となり、被膜欠陥が発生したり、鉄と反応して被膜が黒色化するので、保持温度は900℃以下が好ましい。より好ましくは870℃以下である。
焼付時間が30秒未満であると、リン酸アルミニウムの結晶化が十分に進行しないため好ましくない。焼付時間が100秒超であると、リン酸アルミニウムの分解が過多となり、被膜欠陥が発生したり、鉄と反応して被膜が黒色化するので、好ましくない。
表1−1に示す成分組成のスラブ(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、該熱延鋼板に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。
これにより、フォルステライト系被膜がなく、鏡面光沢を有する二次再結晶が完了した方向性電磁鋼板を得た。母材鋼板の化学成分を表1−2に示した。
この冷延鋼板に、脱炭焼鈍と窒化焼鈍を施した後、鋼板表面にMgOを主体とする焼鈍分離剤の水スラリーを塗布した。次いで、1200℃、20時間の仕上げ焼鈍を行った。
なお、X線回折では、株式会社リガク製のX線回折装置SmartLabを用いた。測定方法としては、斜入射X線回折法を用いた。
Claims (3)
- 母材鋼板と;
前記母材鋼板上に形成され、非晶質のSiO2からなる酸化物被膜と;
前記酸化物被膜上に形成された張力絶縁被膜と;
を備え、
前記母材鋼板は、化学成分として、質量%で、
C:0.0001〜0.085%;
Si:0.80〜7.00%;
Mn:0.00〜1.00%;
酸可溶性Al:0.000〜0.065%;
S+0.406・Seで表されるSeq:0〜0.050%;
を含有し、
残部:Fe及び不純物からなり、
X線回折で得られるクリストバライト型リン酸アルミニウムのピークの半値幅であるFWHMが、
(i)Co−Kα励起源を用いてX線回折をしたとき、2θ=24.8°に現れるピークの半値幅であるFWHM−Coが2.5degree以下である;
又は、
(ii)Cu−Kα励起源を用いてX線回折をしたとき、2θ=21.3°に現れるピークの半値幅であるFWHM−Cuが2.1degree以下である;
ことを特徴とする方向性電磁鋼板。 - フォルステライト系被膜を有さないことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記母材鋼板が、前記化学成分として、さらに、質量%で、
N:0.001〜0.012%;
P:0〜0.50%;
Ni:0〜1.00%;
Sn:0〜0.30%;
Sb:0〜0.30%;
Cu:0.01〜0.80%
の1種又は2種以上を含むことを特徴とする請求項1又は2に記載の方向性電磁鋼板。
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