JP6683724B2 - 方向性電磁鋼板およびその製造方法 - Google Patents
方向性電磁鋼板およびその製造方法 Download PDFInfo
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- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 title claims description 87
- 238000000034 method Methods 0.000 title claims description 38
- 238000004519 manufacturing process Methods 0.000 title claims description 37
- 238000000137 annealing Methods 0.000 claims description 108
- 239000013078 crystal Substances 0.000 claims description 41
- 238000005261 decarburization Methods 0.000 claims description 39
- 238000005097 cold rolling Methods 0.000 claims description 37
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 230000009467 reduction Effects 0.000 claims description 12
- 239000010960 cold rolled steel Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 8
- 238000003303 reheating Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 7
- 229910001566 austenite Inorganic materials 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 238000004458 analytical method Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 12
- 238000001887 electron backscatter diffraction Methods 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 10
- 239000002344 surface layer Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003966 growth inhibitor Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000000879 optical micrograph Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- 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
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- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
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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
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- C—CHEMISTRY; METALLURGY
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- 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
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- C21D8/1222—Hot rolling
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- C—CHEMISTRY; METALLURGY
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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
- C21D8/1233—Cold rolling
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- 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
- C21D8/1266—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 between cold rolling steps
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- 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
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
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- 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
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Dispersion Chemistry (AREA)
- Power Engineering (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
- Chemical Treatment Of Metals (AREA)
Description
このような方向性電磁鋼板は、スラブの加熱後、熱間圧延、熱延板焼鈍、冷間圧延により、通常0.15〜0.35mmの最終厚さに圧延された後、一次再結晶焼鈍と二次再結晶形成のために高温焼鈍を経て製造される。
第一に、コイル状態での熱処理によるコイルの外巻部と内巻部との温度偏差が発生して各部分で同一の熱処理パターンを適用できず、外巻部と内巻部との磁性バラツキが発生する。第二に、脱炭焼鈍後、MgOを表面にコーティングし、高温焼鈍中にBase coatingを形成する過程で多様な表面欠陥が発生するため、実歩留まりを低下させる。第三に、脱炭焼鈍済みの脱炭板をコイル状に巻いた後、高温焼鈍後、再度平坦化焼鈍を経て絶縁コーティングをするため、生産工程が3段階に分けられることによって実歩留まりが低下する問題が発生する。
前記冷間圧延された鋼板を脱炭焼鈍する段階、および前記脱炭焼鈍が完了した鋼板を冷間圧延する段階は、2回以上繰り返されるものであってもよい。
前記脱炭焼鈍後の表面結晶粒の大きさは、150μm〜250μmであってもよい。
前記脱炭焼鈍は、オーステナイト単相領域、またはフェライトおよびオーステナイトの複合相が存在する領域で実施するものであってもよい。
前記脱炭焼鈍は、焼鈍温度850℃〜1000℃および露点温度50℃〜70℃で実施するものであってもよい。
前記脱炭焼鈍時の脱炭量は、重量%で、0.0300%〜0.0600%であってもよい。
前記冷間圧延時の圧下率は、50%〜70%であってもよい。
前記最終焼鈍段階の後、電磁鋼板中の炭素量は、0.002wt%以下であってもよい。
前記第1段階は、300秒以下で実施され、前記第2段階は、60秒〜300秒実施される。
前記スラブの再加熱温度は、1100℃〜1350℃であってもよい。
前記スラブは、重量%で、Mn:0%超過0.1%以下、S:0%超過0.005%以下をさらに含んでもよい。
前記方向性電磁鋼板は、重量%で、Mn:0%超過0.1%以下、S:0%超過0.005%以下、残部はFeおよびその他不可避不純物を含むことができる。
前記方向性電磁鋼板は、重量%で、Si:1.0%〜4.0%およびC:0.0020%未満(0%を含まない)をさらに含んでもよい。
前記電磁鋼板の表面から電磁鋼板の厚さの2〜5μm深さのMgの含有量は、0.0050wt%以下であってもよい。
また、短時間の焼鈍だけでも方向性電磁鋼板を生産することができる。
さらに、従来の方向性電磁鋼板の製造方法とは異なり、冷延鋼板を巻取る工程を必要としない。
さらに、浸窒焼鈍を省略することができる。
重量%で、Si:2.0%、C:0.20%を含有し、残部Feおよび不可避不純物からなるスラブを1150℃の温度で加熱した後、熱間圧延し、次に、焼鈍温度900℃、露点温度60℃で熱延板焼鈍を施した。以降、鋼板を冷却した後、酸洗を実施し、65%の圧下率で冷間圧延して、厚さ0.8mmの冷延板を製作した。
重量%で、Si:2.0%、C:0.20%を含有し、残部Feおよび不可避不純物からなるスラブを1150℃の温度で加熱した後、熱間圧延し、次に、900℃の温度、露点温度60℃で150秒間熱延板焼鈍を実施し、冷却した後、酸洗を実施し、表4のように、45%〜75%の圧下率で冷間圧延した。冷間圧延された板は、再び900℃の温度で水素、窒素の湿潤(露点温度60℃)混合ガス雰囲気で150秒間脱炭焼鈍を経て、再び、表4のように、45%〜75%の圧下率で冷間圧延して、厚さ0.18〜0.36mmの冷延板を製作した。以降、最終焼鈍時には、950℃の温度で水素、窒素の湿潤(露点温度60℃)混合ガス雰囲気で2分間脱炭焼鈍を実施した後、1100℃の水素雰囲気で3分間熱処理を実施した。これに関係する内容を表4に示した。
重量%で、Si:2.0%、C:0.20%を含有し、残部Feおよび不可避不純物からなるスラブを1150℃の温度で加熱した後、3mmの厚さに熱間圧延し、次に、焼鈍温度900℃、露点温度60℃で150秒間熱延板焼鈍を実施し、冷却した後、酸洗を実施し、60%の圧下率で冷間圧延した。
Claims (12)
- 重量%で、Si:1.0%〜4.0%、C:0.1%〜0.4%を含み、残部はFeおよびその他不可避に混入する不純物からなるスラブを提供する段階と、
前記スラブを再加熱する段階と、
前記スラブを熱間圧延して熱延鋼板を製造する段階と、
前記熱延鋼板を熱延板焼鈍する段階と、
前記熱延板焼鈍された熱延鋼板を冷間圧延する段階と、
前記冷間圧延された鋼板を脱炭焼鈍する段階と、
前記脱炭焼鈍が完了した鋼板を冷間圧延する段階と、
前記冷間圧延が完了した鋼板を最終焼鈍する段階とを含み、
前記脱炭焼鈍後の表面結晶粒の大きさは、150μm〜250μmであり、
前記熱延板焼鈍された熱延鋼板を冷間圧延する段階及び前記脱炭焼鈍が完了した鋼板を冷間圧延する段階での圧下率は、50%〜70%であり、
前記最終焼鈍段階は、焼鈍温度850℃〜1000℃及び露点温度70℃以下で焼鈍する第1段階と、1000℃〜1200℃及びH2 50volume%以上の雰囲気で行う第2段階とを含み、
前記第1段階は、300秒以下で行われ、前記第2段階は、60秒〜300秒で行われる、方向性電磁鋼板の製造方法。 - 前記脱炭焼鈍が完了した鋼板を冷間圧延する段階の後、最終焼鈍する段階は、連続して行われる、請求項1に記載の方向性電磁鋼板の製造方法。
- 前記冷間圧延された鋼板を脱炭焼鈍する段階、および前記脱炭焼鈍が完了した鋼板を冷間圧延する段階は、2回以上繰り返される、請求項2に記載の方向性電磁鋼板の製造方法。
- 前記脱炭焼鈍は、オーステナイト単相領域、またはフェライトおよびオーステナイトの複合相が存在する領域で実施する、請求項3に記載の方向性電磁鋼板の製造方法。
- 前記脱炭焼鈍は、焼鈍温度850℃〜1000℃および露点温度50℃〜70℃で実施する、請求項3に記載の方向性電磁鋼板の製造方法。
- 前記脱炭焼鈍時の脱炭量は、重量%で、0.0300%〜0.0600%である、請求項4に記載の方向性電磁鋼板の製造方法。
- 前記最終焼鈍段階の後、電磁鋼板中の炭素量は、0.002wt%以下である、請求項6に記載の方向性電磁鋼板の製造方法。
- 前記スラブの再加熱温度は、1100℃〜1350℃である、請求項7に記載の方向性電磁鋼板の製造方法。
- 前記スラブは、重量%で、Mn:0%超過0.1%以下、S:0%超過0.005%以下をさらに含む、請求項8に記載の方向性電磁鋼板の製造方法。
- 重量%で、Si:1.0%〜4.0%およびC:0.002%未満(0%を含まない)を含み、残部はFeおよびその他不可避不純物からなり、
ゴス結晶粒中の、外接円の直径(D1)と内接円の直径(D2)との比(D2/D1)が0.5以上のものが、全体ゴス結晶粒中の95%以上であり、ゴス分率が72%以上である、方向性電磁鋼板。 - 前記方向性電磁鋼板は、重量%で、Mn:0%超過0.1%以下、S:0%超過0.005%以下をさらに含む、請求項10に記載の方向性電磁鋼板。
- 前記電磁鋼板の表面から電磁鋼板の厚さの2μm〜5μm深さにおけるMgの含有量は、0.0050wt%以下である、請求項10に記載の方向性電磁鋼板。
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Application Number | Priority Date | Filing Date | Title |
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KR101675318B1 (ko) * | 2015-12-21 | 2016-11-11 | 주식회사 포스코 | 방향성 전기강판 및 이의 제조방법 |
KR101887605B1 (ko) * | 2016-12-22 | 2018-08-10 | 주식회사 포스코 | 방향성 전기강판 및 이의 제조방법 |
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2014
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US20210265087A1 (en) | 2021-08-26 |
KR20160063895A (ko) | 2016-06-07 |
JP2020063512A (ja) | 2020-04-23 |
US20170271061A1 (en) | 2017-09-21 |
CN107002161B (zh) | 2019-11-29 |
US11031162B2 (en) | 2021-06-08 |
EP3225703A1 (en) | 2017-10-04 |
EP3225703A4 (en) | 2017-12-06 |
WO2016085022A1 (ko) | 2016-06-02 |
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CN107002161A (zh) | 2017-08-01 |
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