JPWO2011115120A1 - 方向性電磁鋼板の製造方法 - Google Patents
方向性電磁鋼板の製造方法 Download PDFInfo
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- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 title claims description 48
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 121
- 239000010959 steel Substances 0.000 claims abstract description 121
- 238000000137 annealing Methods 0.000 claims abstract description 105
- 239000011521 glass Substances 0.000 claims abstract description 57
- 238000005261 decarburization Methods 0.000 claims abstract description 27
- 238000005097 cold rolling Methods 0.000 claims abstract description 17
- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- 239000010960 cold rolled steel Substances 0.000 claims description 17
- 239000012535 impurity Substances 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 229910052787 antimony Inorganic materials 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 230000004907 flux Effects 0.000 description 33
- 238000005121 nitriding Methods 0.000 description 22
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 18
- 238000011156 evaluation Methods 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 14
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 230000007547 defect Effects 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 11
- 238000001953 recrystallisation Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000003112 inhibitor Substances 0.000 description 10
- 229910021529 ammonia Inorganic materials 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000008119 colloidal silica Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Abstract
Description
(1) Si:2.5質量%〜4.0質量%、C:0.02質量%〜0.10質量%、Mn:0.05質量%〜0.20質量%、酸可溶性Al:0.020質量%〜0.040質量%、N:0.002質量%〜0.012質量%、S:0.001質量%〜0.010質量%、P:0.01質量%〜0.08質量%、及びTe:0.0005質量%〜0.0050質量%を含有し、残部がFe及び不可避的不純物からなる鋼を1320℃以下に加熱して熱間圧延を行い、熱間圧延鋼板を得る工程と、
前記熱間圧延鋼板の焼鈍を行って焼鈍圧延を得る工程と、
前記焼鈍鋼板の冷間圧延を行って冷間圧延鋼板を得る工程と、
前記冷間圧延鋼板の脱炭焼鈍及び窒化焼鈍を行って脱炭窒化鋼板を得る工程と、
前記脱炭窒化鋼板の表面に焼鈍分離剤を塗布し、前記脱炭窒化鋼板の仕上焼鈍を行ってグラス皮膜を形成する工程と、
を有し、
前記脱炭窒化鋼板のN含有量が0.0150質量%〜0.0250質量%であり、かつ、2×[Te]+[N]≦0.0300質量%の関係が成り立つようにすることを特徴とする方向性電磁鋼板の製造方法。ここで、[Te]は、前記脱炭窒化焼鈍鋼板のTe含有量であり、[N]は、前記脱炭窒化焼鈍鋼板のN含有量である。
(2) 前記脱炭焼鈍及び窒化焼鈍における昇温速度を50℃/s〜300℃/sとすることを特徴とする(1)に記載の方向性電磁鋼板の製造方法。
(3) 前記鋼はさらに、Sn、Sb、Cr、Ni、P、B、Mo、及びCuからなる群から選ばれる1種または複数種を0.01質量%〜0.3質量%含有することを特徴とする(1)または(2)に記載の方向性電磁鋼板の製造方法。
(4) 前記仕上焼鈍が行われた鋼板の純化焼鈍を1170℃以上の温度で15時間以上行う工程をさらに有することを特徴とする(1)〜(3)のいずれかに記載の方向性電磁鋼板の製造方法。
低温スラブ加熱法により方向性電磁鋼板を製造する場合は、インヒビターの作用を強化するために、脱炭焼鈍の後に連続して窒化処理を行ったり、脱炭焼鈍と同時に窒化処理を行ったりして、鋼板中の窒素を増加させる。また、さらにインヒビターを強化して、良好な磁気特性を得るために、Teを含有させることがある。しかしながら、Teを多く含み過ぎると良好なグラス皮膜を形成することができない。
詳細は実施例1で後述するが、図1において、○印は磁束密度B8の平均値が1.93T以上であり、かつグラス皮膜の欠陥が5個以下で磁束密度及びグラス皮膜が共に良好であったものを示す。●印は磁束密度B8の平均値が1.93T未満で磁束密度は良好ではないが、グラス皮膜の欠陥は5個以下でグラス皮膜は良好であったものを示す。さらに、×印はグラス皮膜の欠陥が5個を超え、グラス皮膜が良好でなかったものを示している。
Si:3.2質量%、C:0.06質量%、Mn:0.09質量%、Al:0.028質量%、N:0.008質量%、及びS:0.006質量%を含有し、更に図1に示すように、Teの量が0.0003質量%〜0.0350質量%の範囲で異なるようにTeを含有し、残部がFe及び不可避的不純物からなる合計8種類の鋼塊を真空溶解炉にて作製した。そして、1150℃で鋼塊の焼鈍を1時間行い、その後、熱間圧延を行って、厚さが2.3mmの熱間圧延鋼板を得た。
真空溶解炉にて、Si:3.3質量%、C:0.07質量%、Mn:0.10質量%、Al:0.030質量%、N:0.007質量%、S:0.007質量%、及びSn:0.05質量%を含有し、更に、表1に示す量のTeを含有し、残部がFe及び不可避的不純物からなる合計6種類の鋼塊を真空溶解炉にて作製した。また、Teを含有しないが他の元素の組成が同じである鋼塊も同様に作製した。次いで、1200℃で鋼塊の焼鈍を1時間行い、その後、熱間圧延を行って、厚さが2.6mmの熱間圧延鋼板を得た。
Si:3.1質量%、C:0.06質量%、Mn:0.10質量%、Al:0.031質量%、N:0.008質量%、S:0.007質量%、Sn:0.06質量%、Cr:0.1質量%、及びTe:0.0023質量%を含有し、残部がFe及び不可避的不純物からなる鋼塊を真空溶解炉にて作製した。次いで、1100℃で鋼塊の焼鈍を1時間行い、その後、熱間圧延を行って厚さが2.3mmの熱間圧延鋼板を得た。
Si:3.4質量%、C:0.07質量%、Mn:0.09質量%、Al:0.029質量%、N:0.007質量%、S:0.005質量%、P:0.025質量%、Sn:0.06質量%、及びTe:0.0026質量%を含有し、残部がFe及び不可避的不純物からなる鋼塊を真空溶解炉にて作製した。次いで、1120℃で鋼塊の焼鈍を1時間行い、その後、熱間圧延を行って厚さが2.3mmの熱間圧延鋼板を得た。
Claims (4)
- Si:2.5質量%〜4.0質量%、C:0.02質量%〜0.10質量%、Mn:0.05質量%〜0.20質量%、酸可溶性Al:0.020質量%〜0.040質量%、N:0.002質量%〜0.012質量%、S:0.001質量%〜0.010質量%、P:0.01質量%〜0.08質量%、及びTe:0.0005質量%〜0.0050質量%を含有し、残部がFe及び不可避的不純物からなる鋼を1320℃以下に加熱して熱間圧延を行い、熱間圧延鋼板を得る工程と、
前記熱間圧延鋼板の焼鈍を行って焼鈍圧延を得る工程と、
前記焼鈍鋼板の冷間圧延を行って冷間圧延鋼板を得る工程と、
前記冷間圧延鋼板の脱炭焼鈍及び窒化焼鈍を行って脱炭窒化鋼板を得る工程と、
前記脱炭窒化鋼板の表面に焼鈍分離剤を塗布し、前記脱炭窒化鋼板の仕上焼鈍を行ってグラス皮膜を形成する工程と、
を有し、
前記脱炭窒化鋼板のN含有量が0.0150質量%〜0.0250質量%であり、かつ、2×[Te]+[N]≦0.0300質量%の関係が成り立つようにすることを特徴とする方向性電磁鋼板の製造方法。
(ここで、[Te]は、前記脱炭窒化鋼板のTe含有量であり、[N]は、前記脱炭窒化鋼板のN含有量である。) - 前記脱炭焼鈍及び窒化焼鈍における昇温速度を50℃/s〜300℃/sと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。
- 前記鋼はさらに、Sn、Sb、Cr、Ni、P、B、Mo、及びCuからなる群から選ばれる1種または複数種を0.01質量%〜0.3質量%含有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。
- 前記仕上焼鈍が行われた鋼板の純化焼鈍を1170℃以上の温度で15時間以上行う工程をさらに有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。
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