JP2023508029A - 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 abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000137 annealing Methods 0.000 claims abstract description 124
- 238000005261 decarburization Methods 0.000 claims abstract description 64
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 63
- 239000010959 steel Substances 0.000 claims abstract description 63
- 238000000034 method Methods 0.000 claims abstract description 41
- 238000005097 cold rolling Methods 0.000 claims abstract description 25
- 238000005098 hot rolling Methods 0.000 claims abstract description 15
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 11
- 239000013078 crystal Substances 0.000 claims description 81
- 238000005096 rolling process Methods 0.000 claims description 35
- 230000008569 process Effects 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 19
- 239000012535 impurity Substances 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 7
- 229910001566 austenite Inorganic materials 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 238000010438 heat treatment Methods 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 238000001887 electron backscatter diffraction Methods 0.000 description 6
- 239000002344 surface layer Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000001953 recrystallisation Methods 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000010924 continuous production Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003966 growth inhibitor Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
Description
2次脱炭焼鈍する段階の後および連続焼鈍する段階の前の昇温段階で、950~1000℃の温度範囲を10℃/秒以下の速度で加熱することを特徴とする。
スラブは、Mn:0.1重量%以下およびS:0.005重量%以下をさらに含み得る。
熱延板焼鈍する段階で、脱炭過程を含み得る。
熱延板焼鈍する段階は、850℃~1000℃の温度および露点温度70℃以下で焼鈍することが好ましい。
1次脱炭焼鈍する段階は、850℃~1000℃の温度および露点温度50℃~70℃で焼鈍することが好ましい。
1次脱炭焼鈍する段階は、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焼鈍することが好ましい。
1次脱炭焼鈍する段階の後、結晶粒の平均直径が150~250μmであってもよい。
1次脱炭焼鈍する段階および2次冷間圧延する段階は、2回以上繰り返されることが好ましい。
2次脱炭焼鈍する段階は、850℃~1000℃の温度および露点温度50℃~70℃で焼鈍することが好ましい。
2次脱炭焼鈍する段階は、30秒~5分間焼鈍することが好ましい。
連続焼鈍する段階は、1000℃~1200℃の温度および露点温度-20℃以下で焼鈍することが好ましい。
連続焼鈍する段階は、30秒~5分間焼鈍することが好ましい。
連続焼鈍する段階は、1000℃~1100℃で1次焼鈍する段階と、1130~1200℃で2次焼鈍する段階とを含むことが好ましい。
<100>方向が鋼板の圧延方向(RD方向)と10~15゜の角度をなす結晶粒が30%以下であってもよい。
本発明の一態様による方向性電磁鋼板は、重量%で、Si:1.0%~4.0%、C:0.005%以下(0%を除く)、並びに残部はFeおよび不可避不純物からなることが好ましい。
本発明の一態様による方向性電磁鋼板は、Mn:0.1重量%以下およびS:0.005重量%以下をさらに含み得る。
また、結晶粒成長抑制剤としてAlNおよびMnSを使用しないので、1300℃以上の高温にスラブを加熱する必要がない。
また、析出物であるN、Sを除去する必要がなく、純化焼鈍時間が相対的に短くなって、生産性が向上する。
また、幅方向に亀裂した磁気的特性を有する方向性電磁鋼板を提供することができる。
熱延温度や冷却温度は特に制限されないが、磁性に優れた一実施形態として、熱延終了温度を950℃以下とし、冷却を水によって急冷して600℃以下で巻取る。
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、1250℃の温度で加熱した後、熱間圧延し、続いて、焼鈍温度950℃、露点温度60℃で熱延板焼鈍をした。以後、鋼板を冷却した後、酸洗を実施し、50%の圧下率で冷間圧延して、厚さ1.4mmの冷延板を製作した。
重量%で、Si:2.52%、C:0.195%を含有し、残部Feおよび不可避不純物からなるスラブを、1220℃の温度で加熱した後、熱間圧延し、続いて、焼鈍温度950℃、露点温度60℃で熱延板焼鈍をした。以後、鋼板を冷却した後、酸洗を実施し、60%の圧下率で冷間圧延して、厚さ0.9mmの冷延板を製作した。
Claims (19)
- 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1次冷間圧延する段階と、
前記1次冷間圧延された鋼板を1次脱炭焼鈍する段階と、
前記脱炭焼鈍が完了した鋼板を2次冷間圧延する段階と、
前記2次冷間圧延が完了した鋼板を2次脱炭焼鈍する段階と、
2次脱炭焼鈍された鋼板を連続焼鈍する段階とを含み、
前記2次脱炭焼鈍する段階の後および前記連続焼鈍する段階の前の昇温段階で、950~1000℃の温度範囲を10℃/秒以下の速度で加熱することを特徴とする方向性電磁鋼板の製造方法。 - 前記スラブは、重量%で、Si:1.0%~4.0%、C:0.1%~0.4%、並びに残部はFeおよび不可避不純物からなることを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記スラブは、Mn:0.1重量%以下およびS:0.005重量%以下をさらに含むことを特徴とする請求項2に記載の方向性電磁鋼板の製造方法。
- 前記熱延板焼鈍する段階で、脱炭過程を含むことを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記熱延板焼鈍する段階は、850℃~1000℃の温度および露点温度70℃以下で焼鈍することを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記1次脱炭焼鈍する段階は、850℃~1000℃の温度および露点温度50℃~70℃で焼鈍することを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記1次冷間圧延された鋼板を1次脱炭焼鈍する段階は、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焼鈍することを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記1次冷間圧延された鋼板を脱炭焼鈍する段階の後、結晶粒の平均直径が150~250μm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の製造方法。
- 前記1次脱炭焼鈍する段階および前記2次冷間圧延する段階は、2回以上繰り返されることを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記2次脱炭焼鈍する段階は、850℃~1000℃の温度および露点温度50℃~70℃で焼鈍することを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記2次脱炭焼鈍する段階は、30秒~5分間焼鈍することを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記連続焼鈍する段階は、1000℃~1200℃の温度および露点温度-20℃以下で焼鈍することを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記連続焼鈍する段階は、30秒~5分間焼鈍することを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 前記連続焼鈍する段階は、1000℃~1100℃で1次焼鈍する段階と、1130~1200℃で2次焼鈍する段階とを含むことを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 全体結晶粒中における外接円の直径(D1)と内接円の直径(D2)との比(D2/D1)が0.4以上の結晶粒が90%以上であり、
<100>方位が鋼板の圧延方向(RD方向)と5゜以下に平行な結晶粒が15%以上であることを特徴とする方向性電磁鋼板。 - 全体結晶粒中の結晶粒の粒径が50μm~5000μmの結晶粒の分率が80%以上であることを特徴とする請求項15に記載の方向性電磁鋼板。
- <100>方向が鋼板の圧延方向(RD方向)と10~15゜の角度をなす結晶粒が30%以下であることを特徴とする請求項15に記載の方向性電磁鋼板。
- 前記電磁鋼板は、重量%で、Si:1.0%~4.0%、C:0.005%以下(0%を除く)、並びに残部はFeおよび不可避不純物からなることを特徴とする請求項15に記載の方向性電磁鋼板。
- 前記電磁鋼板は、Mn:0.1重量%以下およびS:0.005重量%以下をさらに含むことを特徴とする請求項18に記載の方向性電磁鋼板。
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