JP6156646B2 - 磁気特性および被膜密着性に優れる方向性電磁鋼板 - Google Patents
磁気特性および被膜密着性に優れる方向性電磁鋼板 Download PDFInfo
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Description
鋼板への付与張力(MPa)=(鋼板ヤング率(GPa))×板厚(mm)×反りの大きさ(mm)÷(反り測定試験片長さ(mm))2×103
(ただし、上記鋼板のヤング率は132GPaを用いる。)
鋼板への付与張力(MPa)=(鋼板ヤング率(GPa))×板厚(mm)×反りの大きさ(mm)÷(反り測定試験片長さ(mm))2×103
(ただし、上記鋼板のヤング率は132GPaを用いる。)
なお、被膜が2層からなる場合のそれぞれの被膜の張力は、まず、最外層(B層)のみを除去して反りを測定し、この反りからB層の張力を算出し、次いで、内層(A層)を除去して反りを測定し、この反りから(A層+B層)の張力を算出し、上記B層と(A層+B層)の張力の差分を、内層(A層)の張力とすることで測定する。
C:0.001〜0.10mass%
Cは、ゴス方位粒を発生させるのに有用な成分であり、斯かる効果を有効に発現させるためには、0.001mass%以上含有させることが好ましい。しかし、0.10mass%を超えると、後工程の脱炭焼鈍で、磁気時効を起こさないレベル(0.005mass%以下)まで脱炭することが難しくなる。よって、Cは0.001〜0.10mass%の範囲とするのが好ましい。より好ましくは0.010〜0.08mass%の範囲である。
Siは、鋼の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、高温で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1.0mass%添加するのが好ましい。しかし、5.0mass%を超える添加は、冷間圧延することが困難となる。よって、Siは1.0〜5.0mass%の範囲とするのが好ましい。より好ましくは2.0〜4.5mass%の範囲である。
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が混在しているときには、MnSやMnSe等の析出物を形成し、抑制剤(インヒビター)としての機能を発揮する。Mnの含有量が0.01mass%より少ないと、上記の効果が不十分となり、一方、1.0mass%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。よって、Mnは0.01〜1.0mass%の範囲とするのが好ましい。より好ましくは0.015〜0.80mass%の範囲である。
Alは、鋼中でAlNを形成して分散第二相となり、インヒビターとして作用する有用成分であるが、添加量が0.003mass%に満たないと、AlNの析出量が十分に確保できず、一方、0.050mass%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。よって、Alは、sol.Alで0.003〜0.050mass%の範囲とするのが好ましい。より好ましくは0.005〜0.045mass%の範囲である。
Nは、Alと同様、AlNを形成するために必要な成分である。添加量が0.001mass%を下回ると、AlNの析出が不十分となり、一方、0.020mass%を超えて添加すると、スラブ再加熱時にふくれ等を生じて表面欠陥の発生原因となる。よって、Nは0.001〜0.020mass%の範囲とするのが好ましい。より好ましくは0.002〜0.015mass%の範囲である。
SおよびSeは、MnやCuと結合してMnSe,MnS,Cu2−XSe,Cu2−XSを形成して鋼中の分散第二相となり、インヒビターの作用を発揮する有用成分である。SおよびSeの合計含有量が0.001mass%に満たないと、上記効果に乏しく、一方、0.05mass%を超えると、スラブ再加熱時の固溶が不十分となるだけでなく、製品板の表面欠陥の原因ともなる。よって、単独添加または複合添加のいずれの場合においても合計で0.01〜0.05mass%の範囲とするのが好ましい。より好ましくは0.015〜0.045mass%の範囲である。
本発明の方向性電磁鋼板は、上記に説明した成分組成を有する鋼を常法の精錬プロセスで溶製し、連続鋳造法または造塊−分塊圧延法を用いて鋼素材(スラブ)とした後、上記スラブを熱間圧延して熱延板とし、熱延板焼鈍を施しあるいは施さず、その後、1回もしくは中間焼鈍を挟む1回以上の冷間圧延により最終板厚の冷延板とし、一次再結晶焼鈍あるいは脱炭焼鈍を兼ねた一次再結晶焼鈍を施した後、例えば、MgOを主成分とする焼鈍分離剤を鋼板表面に塗布し、乾燥し、コイルに巻き取った後、仕上焼鈍を施してフォルステライトを主体とする被膜層を形成し、さらに、ガラス質の絶縁被膜の塗布、焼付けと形状矯正を兼ねた平坦化焼鈍を経る一連の工程からなる製造方法で製造することができる。上記一次再結晶焼鈍(脱炭焼鈍)、および、仕上焼鈍前に鋼板表面に塗布する焼鈍分離剤以外の製造条件については、従来公知の条件を採用することができ、特に制限はない。
Claims (3)
- 鋼板表面に、鋼板側に形成された酸化物を主体とする被膜層Aと、表面側に形成されたガラス質を主体とする被膜層Bの2層から構成される張力付与型絶縁被膜を有する方向性電磁鋼板において、
上記鋼板側被膜層Aの酸化物はフォルステライトまたはコーディエライトであり、表面側被膜層Bのガラス質はMg,Al,Ca,Ti,Nd,Mo,Cr,B,Ta,CuおよびMnのうちから選ばれる1種または2種以上の金属元素を含有する珪リン酸塩ガラスであり、かつ、
上記鋼板側被膜層Aが鋼板に与える張力σAに対する表面側被膜層Bが鋼板に与える張力σBの比R(σB/σA)が1.20〜4.0の範囲にあることを特徴とする方向性電磁鋼板。ここで、上記鋼板表面の被膜が鋼板に付与する張力σAおよびσBは、鋼板片面側の被膜をアルカリや酸などを用いて除したときの鋼板の反りの大きさXから、下記式を用いて算出した値である。
鋼板への付与張力(MPa)=(鋼板ヤング率(GPa))×板厚(mm)×反りの大きさ(mm)÷(反り測定試験片長さ(mm))2×103
(ただし、上記鋼板のヤング率は132GPaを用いる。) - 鋼板側被膜層Aが鋼板に与える張力σAが6MPa以下であることを特徴とする請求項1に記載の方向性電磁鋼板。
- 鋼板側被膜層Aの目付量が酸素換算で1.0〜3.0g/m2(両面)であることを特徴とする請求項1または2に記載の方向性電磁鋼板。
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