WO2014148328A1 - 高周波鉄損特性に優れる無方向性電磁鋼板 - Google Patents

高周波鉄損特性に優れる無方向性電磁鋼板 Download PDF

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WO2014148328A1
WO2014148328A1 PCT/JP2014/056430 JP2014056430W WO2014148328A1 WO 2014148328 A1 WO2014148328 A1 WO 2014148328A1 JP 2014056430 W JP2014056430 W JP 2014056430W WO 2014148328 A1 WO2014148328 A1 WO 2014148328A1
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mass
iron loss
steel sheet
less
oriented electrical
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PCT/JP2014/056430
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English (en)
French (fr)
Japanese (ja)
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新司 小関
尾田　善彦
広朗 戸田
多津彦 平谷
中西　匡
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Ｊｆｅスチール株式会社
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Priority to EP14767789.2A priority Critical patent/EP2977480B1/en
Priority to RU2015145284A priority patent/RU2650469C2/ru
Priority to KR1020157023252A priority patent/KR101700694B1/ko
Priority to US14/767,735 priority patent/US20160076125A1/en
Priority to CN201480016783.0A priority patent/CN105074032B/zh
Publication of WO2014148328A1 publication Critical patent/WO2014148328A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • H01F1/16—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 in the form of sheets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/1222—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/1233—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/1244—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
    • C21D8/1255—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 with diffusion of elements, e.g. decarburising, nitriding
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/1244—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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/1244—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
    • C21D8/1272—Final recrystallisation annealing
    • 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
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust

Definitions

  • the present invention relates to a non-oriented electrical steel sheet having excellent high-frequency iron loss characteristics.
  • Motors for hybrid vehicles and electric vehicles are driven in the high frequency range of 400 to 2 kHz from the viewpoint of miniaturization and high efficiency.
  • the non-oriented electrical steel sheet used for the core material of such a high-frequency motor is desired to have low iron loss at high frequencies.
  • the method of reducing the plate thickness not only makes handling difficult due to a decrease in the rigidity of the material, but also increases the number of stamping steps and the number of loading steps, resulting in a decrease in productivity.
  • the method for increasing the specific resistance does not have the disadvantages as described above, it can be said that it is desirable as a high-frequency iron loss reduction method.
  • Si is an element having a large solid solution strengthening ability
  • Mn has a smaller solid solution strengthening ability than Si, it is possible to reduce high-frequency iron loss while suppressing a decrease in manufacturability.
  • Patent Document 1 discloses Si: 0.5 to 2.5 mass%, Mn: 1.0 to 3.5 mass%, Al: 1.0 to 3.
  • a non-oriented electrical steel sheet containing 0 mass% is disclosed.
  • Patent Document 2 discloses a non-oriented electrical steel sheet containing Si: 3.0 mass% or less, Mn: 1.0-4.0 mass%, Al: 1.0-3.0 mass%. .
  • the present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to provide a non-oriented electrical steel sheet having stable and excellent high-frequency iron loss characteristics even when it contains a large amount of Mn. It is to provide.
  • the inventors have made extensive studies focusing on the impurity components contained in the steel sheet in order to solve the above problems.
  • the high-frequency iron loss characteristics of the high Mn-added steel are caused by the presence of Bi contained as impurities. Therefore, by suppressing the Bi content, the high-frequency iron loss can be reduced even at a high Mn content.
  • the inventors have found that it can be stably reduced, and have developed the present invention.
  • C 0.005 mass% or less
  • Si 1.5-4 mass%
  • Mn 1.0-5 mass%
  • P 0.1 mass% or less
  • S 0.005 mass% or less
  • This is a non-oriented electrical steel sheet containing Al: 3 mass% or less, N: 0.005 mass% or less, Bi: 0.0030 mass% or less, and the balance being composed of Fe and inevitable impurities.
  • the non-oriented electrical steel sheet of the present invention further includes one or two kinds selected from Ca: 0.0005 to 0.005 mass% and Mg: 0.0002 to 0.005 mass% in addition to the above component composition. It is characterized by containing.
  • non-oriented electrical steel sheet of the present invention may be one or two selected from Sb: 0.0005 to 0.05 mass% and Sn: 0.0005 to 0.05 mass% in addition to the above component composition. It contains seeds.
  • non-oriented electrical steel sheet of the present invention is characterized by further containing Mo: 0.0005 to 0.0030 mass% in addition to the above component composition.
  • the non-oriented electrical steel sheet of the present invention is characterized in that the Ti content is 0.002 mass% or less.
  • the ⁇ marks in FIG. 1 show the experimental results as the relationship between the Mn addition amount and the iron loss W 10/400 . From this result, when Mn is less than 1 mass%, the iron loss decreases as the amount of added Mn increases. However, when 1 mass% or more, the iron loss decreases gradually, and when it exceeds 4 mass%, the iron loss increases conversely. all right. In order to investigate this cause, when a steel sheet containing 2 mass% of Mn was observed with TEM, granular Bi was observed at the grain boundaries.
  • C 0.0014 mass%
  • Si 3.33 mass%
  • Al 1.2 mass%
  • P 0.014 mass%
  • S 0.0006 mass%
  • N steel containing 0.0020 mass%
  • Bi based on high-purity steel with 0.0010 mass% or less
  • Mn being added in various ways within the range of 0.1 to 5.2 mass%
  • Bi is generally an impurity mixed in from scrap, and not only the amount mixed but also the variation gradually increases with the recent increase in scrap usage ratio.
  • Such an increase in Bi content is not a big problem in a magnetic steel sheet having a low Mn content, but in a steel having a high Mn content, the grain growth property is reduced due to the Mn solution drag, so that the trace amount is small. It is considered that it is greatly influenced by Bi.
  • FIG. 2 shows the results of the experiment as the relationship between the Bi content and the iron loss W 10/400 . From this figure, it can be seen that the iron loss is greatly reduced when the Bi content is 0.0030 mass% or less (30 massppm or less). This is presumably because grain growth was improved by reducing Bi. From this result, it was found that the Bi content must be reduced to 0.0030 mass% or less in order to suppress the adverse effect of Bi on grain growth.
  • the present invention is based on the above novel findings.
  • C 0.005 mass% or less
  • C is an element that forms carbide with Mn. If the amount exceeds 0.005 mass%, the amount of the Mn carbide increases to inhibit grain growth, so the upper limit is set to 0.005 mass%. And Preferably it is 0.002 mass% or less.
  • Si 1.5-4 mass% Since Si is an element effective in increasing the specific resistance of steel and reducing iron loss, it is added in an amount of 1.5 mass% or more. On the other hand, if the addition exceeds 4 mass%, the magnetic flux density decreases, so the upper limit is set to 4 mass%. Preferably, the lower limit of Si is 2.0 mass%, and the upper limit is 3.0 mass%.
  • Mn 1.0-5 mass%
  • Mn is an important component in the present invention, which is effective in increasing the specific resistance of steel and reducing iron loss without greatly impairing workability, and is added in an amount of 1.0 mass% or more. In order to further obtain the iron loss reduction effect, addition of 1.6 mass% or more is preferable. On the other hand, if added over 5 mass%, the magnetic flux density is lowered, so the upper limit is made 5 mass%. Preferably, the lower limit of Mn is 2 mass% and the upper limit is 3 mass%.
  • P 0.1 mass% or less
  • P is an element having a large solid solution strengthening ability, and if it exceeds 0.1 mass%, the steel sheet becomes too hard and the productivity is reduced, so that it is limited to 0.1 mass% or less. .
  • it is 0.05 mass% or less.
  • S 0.005 mass% or less S is an unavoidable impurity, and if contained in excess of 0.005 mass%, grain growth is inhibited by precipitation of MnS and iron loss increases, so the upper limit is 0.005 mass%. To do. Preferably it is 0.001 mass% or less.
  • Al 3 mass% or less
  • Al is an element effective in increasing the specific resistance of steel and reducing iron loss.
  • the upper limit is 3 mass%.
  • the Al content is less than 0.1 mass%, fine AlN precipitates to inhibit grain growth and increase iron loss, so the lower limit is preferably set to 0.1 mass%.
  • N 0.005 mass% or less N is an unavoidable impurity that penetrates into the steel from the atmosphere. When the content is large, grain growth is inhibited by precipitation of AlN and iron loss increases.
  • the upper limit is limited to 0.005 mass%. Preferably it is 0.003 mass% or less.
  • Bi 0.0030 mass% or less Bi is an important element to be controlled that adversely affects high-frequency iron loss characteristics in the present invention. As can be seen from FIG. 2 described above, the Bi content is 0.0030 mass%. When it exceeds, iron loss will increase rapidly. Therefore, Bi is limited to 0.0030 mass% or less. Preferably it is 0.0010 mass% or less.
  • the non-oriented electrical steel sheet of the present invention preferably further contains any one or two of Ca and Mg in addition to the above component composition.
  • Ca: 0.0005 to 0.005 mass% Ca is an element that is effective in suppressing the harmful effects of Bi and reducing iron loss by forming sulfides and complexing with Bi to be coarsened. In order to obtain such an effect, 0.0005 mass% or more is preferably added. However, if added over 0.005 mass%, the amount of precipitated CaS becomes too large, and conversely, iron loss increases, so the upper limit is preferably set to 0.005 mass%. More preferably, the lower limit of Ca is 0.001 mass%, and the upper limit is 0.004 mass%.
  • Mg 0.0002 to 0.005 mass%
  • Mg is an element that is effective in suppressing the harmful effects of Bi and reducing iron loss by forming oxides and complexing and coarsening with Bi. In order to obtain such an effect, it is preferable to add 0.0002 mass% or more. However, it is difficult to add over 0.005 mass%, and the cost is unnecessarily increased, so the upper limit is preferably made 0.005%. More preferably, the lower limit of Mg is 0.001 mass%, and the upper limit is 0.004 mass%.
  • the non-oriented electrical steel sheet of the present invention preferably further contains the following components.
  • Sb 0.0005 to 0.05 mass%
  • Sn 0.0005 to 0.05 mass% Since Sb and Sn have the effect of improving the texture and increasing the magnetic flux density, they can be added individually or in combination in an amount of 0.0005 mass% or more. More preferably, it is 0.01 mass% or more.
  • the upper limit is preferably set to 0.05 mass%. More preferably, the lower limit of Sb and Sn is 0.01% by mass, and the upper limit is 0.04% by mass.
  • Mo 0.0005 to 0.0030 mass% Mo has the effect of coarsening the formed carbide and reducing iron loss, so 0.0005 mass% or more is preferably added. However, addition of 0.0030 mass% or more increases the amount of carbides and increases the iron loss. Therefore, the upper limit is preferably set to 0.0030 mass%. More preferably, the lower limit of Mo is 0.0010 mass% and the upper limit is 0.0020 mass%.
  • Ti 0.002 mass% or less
  • Ti is an element that forms carbonitride, and when the content is large, the amount of carbonitride precipitated becomes too large to inhibit grain growth and increase iron loss. Therefore, in the present invention, Ti is preferably limited to 0.002 mass% or less. More preferably, it is 0.001 mass% or less.
  • the balance other than the above components is Fe and inevitable impurities. However, as long as the effects of the present invention are not impaired, the inclusion of other elements is not rejected.
  • the manufacturing method of the non-oriented electrical steel sheet of this invention is demonstrated. If the manufacturing method of the non-oriented electrical steel sheet of the present invention is manufactured within the range of the present invention described above, the other conditions are not particularly limited, and the same as the normal non-oriented electrical steel sheet. Can be produced under the following conditions. For example, in a converter or degassing apparatus, etc., a steel having a composition suitable for the present invention is melted and made into a steel material (slab) by continuous casting or ingot-bundling rolling, followed by hot rolling. If necessary, it can be manufactured by a method of annealing by hot-rolled sheet, finishing to a predetermined plate thickness by one or more cold rolling or two or more cold rolling sandwiching intermediate annealing.
  • a steel sheet satisfying the component composition of the present invention is excellent in high-frequency iron loss characteristics despite its high Mn content.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Soft Magnetic Materials (AREA)
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PCT/JP2014/056430 2013-03-22 2014-03-12 高周波鉄損特性に優れる無方向性電磁鋼板 WO2014148328A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP14767789.2A EP2977480B1 (en) 2013-03-22 2014-03-12 Non-oriented electrical steel sheet with excellent high frequency iron loss characteristics
RU2015145284A RU2650469C2 (ru) 2013-03-22 2014-03-12 Лист из нетекстурированной электротехнической стали с отличными потерями в железе на высокой частоте
KR1020157023252A KR101700694B1 (ko) 2013-03-22 2014-03-12 고주파 철손 특성이 우수한 무방향성 전자 강판
US14/767,735 US20160076125A1 (en) 2013-03-22 2014-03-12 Non-oriented electrical steel sheet having an excellent high-frequency iron loss property
CN201480016783.0A CN105074032B (zh) 2013-03-22 2014-03-12 高频铁损特性优异的无方向性电磁钢板

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Application Number Priority Date Filing Date Title
JP2013-060537 2013-03-22
JP2013060537A JP2014185365A (ja) 2013-03-22 2013-03-22 高周波鉄損特性に優れる無方向性電磁鋼板

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EP (1) EP2977480B1 (zh)
JP (1) JP2014185365A (zh)
KR (1) KR101700694B1 (zh)
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RU (1) RU2650469C2 (zh)
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
JP7465354B2 (ja) 2019-12-19 2024-04-10 ポスコホールディングス インコーポレーティッド 無方向性電磁鋼板およびその製造方法

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Publication number Priority date Publication date Assignee Title
JP6738047B2 (ja) 2017-05-31 2020-08-12 Ｊｆｅスチール株式会社 無方向性電磁鋼板とその製造方法
JP7172100B2 (ja) * 2018-04-02 2022-11-16 日本製鉄株式会社 無方向性電磁鋼板
KR102105530B1 (ko) * 2018-09-27 2020-04-28 주식회사 포스코 무방향성 전기강판 및 그 제조방법
JP7328491B2 (ja) * 2018-11-09 2023-08-17 日本製鉄株式会社 無方向性電磁鋼板
KR102175065B1 (ko) * 2018-11-30 2020-11-05 주식회사 포스코 무방향성 전기강판 및 그 제조방법
KR102176351B1 (ko) * 2018-11-30 2020-11-09 주식회사 포스코 무방향성 전기강판 및 그 제조방법
KR102325008B1 (ko) * 2019-12-20 2021-11-10 주식회사 포스코 무방향성 전기강판 및 그 제조방법

Citations (8)

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Publication number Priority date Publication date Assignee Title
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