JP7222444B1 - 無方向性電磁鋼板及びその製造方法 - Google Patents
無方向性電磁鋼板及びその製造方法 Download PDFInfo
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- JP7222444B1 JP7222444B1 JP2022545334A JP2022545334A JP7222444B1 JP 7222444 B1 JP7222444 B1 JP 7222444B1 JP 2022545334 A JP2022545334 A JP 2022545334A JP 2022545334 A JP2022545334 A JP 2022545334A JP 7222444 B1 JP7222444 B1 JP 7222444B1
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- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910052742 iron Inorganic materials 0.000 claims abstract description 25
- 239000013078 crystal Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 56
- 239000010959 steel Substances 0.000 claims description 56
- 238000000137 annealing Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 239000012535 impurity Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 238000005097 cold rolling Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000010960 cold rolled steel Substances 0.000 claims description 5
- 229910052684 Cerium Inorganic materials 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 22
- 238000012360 testing method Methods 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 10
- 229910052779 Neodymium Inorganic materials 0.000 description 9
- 229910052758 niobium Inorganic materials 0.000 description 9
- 229910052720 vanadium Inorganic materials 0.000 description 9
- 229910052727 yttrium Inorganic materials 0.000 description 9
- 150000003568 thioethers Chemical class 0.000 description 8
- 229910052726 zirconium Inorganic materials 0.000 description 7
- 229910000976 Electrical steel Inorganic materials 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 229910052718 tin Inorganic materials 0.000 description 4
- 229910052787 antimony Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052797 bismuth Inorganic materials 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 229910052746 lanthanum Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000002436 steel type Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
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Abstract
Description
各視野において、円相当径が1.0μm以上でS含有量が5質量%以上検出される介在物の個数を求める。具体的には、まず、各視野における介在物をコントラストから特定する。特定した介在物のうち、円相当径が1.0μm以上の介在物について、元素濃度分析(EDS分析)を実施する。検出されたすべての元素(ただしCを除く)について定量し、円相当径が1.0μm以上であり、Mg含有量が5質量%以下かつMn含有量が5質量%以上である介在物と、円相当径が1.0μm以上であり、Mg含有量が5質量%超かつMn含有量が5質量%以上である介在物と、を特定する。
5mm2以上の面積となる観察した視野範囲で特定された介在物のうち、円相当径が1.0μm以上であり、S含有量が5質量%以上かつMn含有量が5質量%以上である介在物のうち、Mg含有量が5質量%以下の介在物と、Mg含有量が5質量%超の介在物の各々の個数を求め、その比を計算する。
観察した視野の総面積に基づいて、個数密度(個/mm2)を求めるときに、得られた数値の小数第3位を四捨五入する。なお、個数密度の測定は、走査電子顕微鏡に組成分析機能を付与された装置(SEM―EDS装置)を用いて行う。
円相当径が5μm以上である介在物の個数密度が1.0個/mm2未満とする方法は、特段制限されないが、例えば、溶鋼がタンディッシュに滞留している間に、介在物を溶鋼表面に浮上させること、連続鋳造において、鋳型内の溶鋼に電磁ブレーキを作用させて、溶鋼が鋳型内に滞留する時間を長くして介在物を溶鋼表面に浮上させること、又は、鉛直方向に長い鋳型を用いて、溶鋼が鋳型内に滞留する時間を長くして介在物を溶鋼表面に浮上させること、等の後に、浮上した介在物を除去するという方法が挙げられる。
引張強さはJIS Z2241:2011の13B号引張試験片を用いて測定する。
化学組成がSi:3.3%、sol.Al:0.7%、Mn:1.2%、C:0.002%、P:0.02%、S:0.0010%、Ti:0.0015%、残部:Fe及び不純物である鋼種(Mg無し)と、上記鋼種のFeの一部に変えてMg:0.0013%を含有する鋼種(Mg添加)を用い、電磁鋼板を作製し、引張強さ、疲労強度を、前述の方法で測定した。
表2A、Bに示す成分を有する無方向性電磁鋼板を、表3Aに示す鋳造時の冷却速度、熱間圧延前の加熱炉における1100℃以上の滞在時間、巻取温度、仕上げ焼鈍の最高到達温度の条件で、表3Aに示す板厚の無方向性電磁鋼板を製造した。
各試験番号の鋼板のミクロ組織を次の方法で観察し、フェライト組織の再結晶部の粒径を求めた。各鋼板の圧延方向及び板厚方向を含む面を有する試験片を作製し、試験片の観察面を鏡面に研磨した後、3%ナイタール腐食液に10秒浸漬して、エッチングにより組織を現出させた。エッチングした観察面を、光学顕微鏡を用いて倍率100倍で3視野観察した。フェライト粒のアスペクト比(圧延方向の長さ/板厚方向の長さ)が3以下の領域を特定し、その領域におけるフェライトの平均結晶粒径をJIS G 0551:2013「鋼-結晶粒度の顕微鏡試験方法」に従って求めた。
板厚0.25mmの鋼板を8枚重ね合わせて、幅方向(圧延直角方向)及び板厚方向を含む面が観察面となるように試験片を樹脂埋めし、樹脂埋めされた試験片の観察面を研磨した。重ね合わせた板厚全厚の領域を、EDS付きのSEMを用いて観察した。介在物の大きさは、画像解析ソフトを用いて大きさを計測して、円相当径として換算したときの直径を算出した。5mm2の範囲につき円相当径が1μm以上の介在物全てについて観察をおこなった。そして、1μm以上となる介在物につきEDS分析を行い、「S含有量が5質量%以上」かつ「Mn含有量が5質量%以上」である介在物のうち、「Mg量が5質量%以下と5質量%超」の介在物の個数密度を測定した。総面積に基づいて、個数密度(個/mm2)を求めるときに、得られた数値の小数第3位を四捨五入し、円相当径が1μm以上である介在物の個数密度とした。円相当径が5μm超の介在物については成分に関わらず大きさだけで判別し、同様に総面積に基づいて個数密度を測定した。こちらについては比率計算の必要が無いので小数第2位を四捨五入して個数密度とした。
無方向性電磁鋼板の周波数400Hz、磁束密度1.0Tにおける鉄損W10/400を、JIS C 2550-1:2011に記載のエプスタイン試験器による電磁鋼帯の磁気特性の測定方法における励磁電流法により求めた。
Claims (4)
- 化学組成が、質量%で、
Si:2.5~4.5%、
sol.Al:0~2.0%、
Mn:0.1~3.5%、
C :0~0.0030%、
P :0~0.10%、
S :0~0.0030%、
N :0~0.050%、
O :0~0.050%、
Mg:0.0003~0.0050%、
Ti:0~0.0030%、
V :0~0.10%、
Sb:0~0.10%、
Nd:0~0.10%、
Bi:0~0.10%、
W :0~0.10%、
Nb:0~0.10%、
Y :0~0.10%、
並びに、
Ni:0~0.5%、
Cr:0~0.5%、
Cu:0~0.5%、
Sn:0~0.2%、
La:0~0.0050%、及び
Ce:0~0.0050%
からなる群から選択される1種以上を含有し、
残部:Fe及び不純物であり、
引張強さが580MPa以上であり、
地鉄の再結晶部の平均結晶粒径が50μm以下であり、
地鉄中に含有される円相当径が1μm以上、かつ、S含有量が5質量%以上の介在物において、Mg含有量が5質量%以下かつMn含有量が5質量%以上である介在物の個数に比べて、Mg含有量が5質量%超かつMn含有量が5質量%以上である介在物の個数が5倍以上である
ことを特徴とする無方向性電磁鋼板。 - 円相当径が5μm以上である介在物の個数密度が1.0個/mm2未満である
ことを特徴とする、請求項1に記載の無方向性電磁鋼板。 - 板厚が0.30mm未満である、
ことを特徴とする請求項1に記載の無方向性電磁鋼板。 - 請求項1に記載の無方向性電磁鋼板を製造する方法であって、
鋳造により鋼スラブを製造する工程、
前記鋼スラブを加熱する工程、
加熱した前記鋼スラブを熱間圧延して熱延鋼板とする工程、
前記熱延鋼板を巻き取る巻取り工程、
前記熱延鋼板を冷間圧延し冷延鋼板とする工程、及び
前記冷延鋼板を仕上げ焼鈍して無方向性電磁鋼板を得る工程
を備え、
前記鋳造において、1300℃から1200℃までの冷却速度を50℃/s以下と、
前記鋼スラブの加熱において、中心温度1100℃以上での滞在時間が2時間未満(0を含まない)とし、
前記巻取り工程において、前記熱延鋼板の巻取り温度を700℃以上とし、
上記仕上げ焼鈍において、最高到達温度を700~900℃とする
ことを特徴とする無方向性電磁鋼板の製造方法。
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JP4280201B2 (ja) | 2004-05-19 | 2009-06-17 | 新日本製鐵株式会社 | 磁気特性に優れた無方向性電磁鋼板 |
EP3859032B1 (en) * | 2018-10-31 | 2023-03-29 | JFE Steel Corporation | Non-oriented electrical steel sheet and method for producing same, and motor core and method for producing same |
WO2020137500A1 (ja) * | 2018-12-27 | 2020-07-02 | Jfeスチール株式会社 | 無方向性電磁鋼板 |
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JPH02263920A (ja) * | 1989-04-03 | 1990-10-26 | Nippon Steel Corp | 低温用無方向性高磁束密度電磁鋼の製造方法 |
JPH03219020A (ja) * | 1990-01-23 | 1991-09-26 | Nkk Corp | 無方向性電磁鋼板の製造方法 |
JP2019178373A (ja) * | 2018-03-30 | 2019-10-17 | 日本製鉄株式会社 | 無方向性電磁鋼板およびその製造方法、並びにモータコアおよびその製造方法 |
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JP2020139198A (ja) * | 2019-02-28 | 2020-09-03 | 日本製鉄株式会社 | 無方向性電磁鋼板 |
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