WO2016159284A1 - 鋼の連続鋳造方法 - Google Patents
鋼の連続鋳造方法 Download PDFInfo
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- WO2016159284A1 WO2016159284A1 PCT/JP2016/060769 JP2016060769W WO2016159284A1 WO 2016159284 A1 WO2016159284 A1 WO 2016159284A1 JP 2016060769 W JP2016060769 W JP 2016060769W WO 2016159284 A1 WO2016159284 A1 WO 2016159284A1
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- mold
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- electromagnetic brake
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
Definitions
- the present invention relates to a steel continuous casting method.
- Patent Document 1 discloses that a swirling flow is generated on the surface of the molten steel in the mold by opposingly installing an electromagnetic stirrer near the long side meniscus of the mold. There is disclosed a technique for suppressing the phenomenon of inclusions and bubbles adhering to the surface of a mold, which causes a slab defect, due to the swirling flow cleaning effect. Moreover, in patent document 2, the electromagnetic brake is made to act on the discharge flow discharged from the discharge hole of an immersion nozzle, and the technique which suppresses the descent
- JP 2008-183597 A Japanese Patent No. 5245800
- the object of the present invention is to solve the above-mentioned conventional problems, suppress internal defects by the electromagnetic brake, avoid occurrence of surface defects due to this electromagnetic brake, and clean the slab compared to the prior art. It is to provide technology that can increase the degree.
- the magnetic flux density (B) of the electromagnetic brake is set.
- the magnetic flux density (B) of the electromagnetic brake means the magnetic flux density at the center of the electromagnetic brake coil.
- D 0 mould thickness (m) measured as the distance between the long sides facing each other in the mold at both ends of the long side of the mold having a horizontal section and a short side and a long side
- D max maximum value (m) of the mold thickness measured as the distance between the long sides facing each other in the mold at the center of the long side of the mold having a horizontal cross section and having a short side and a long side
- H 0 vertical distance from molten steel surface to center of electromagnetic brake coil (m)
- H SEN vertical distance (m) from the bottom of the immersion nozzle to the center of the electromagnetic brake coil
- v flow velocity (m / s) of molten steel discharged from the immersion nozzle
- ⁇ Discharge angle of molten steel (°) obtained as an angle formed with a horizontal line with positive upward.
- a rectangular mold having a short side and a long side in a horizontal cross-sectional shape can be used as the mold.
- the molten steel preferably has a flow velocity v of 0.685 m / s to 0.799 m / s. Thereby, the upward flow is gently formed over the whole, and it becomes easy to suppress the formation of the downward flow along the solidification interface.
- a funnel mold having a horizontal cross-sectional shape having a short side and a long side, and the distance between the long sides facing each other in the mold being extended at the center of the long side as compared with both ends of the long side Is preferably used.
- D max / D 0 is preferably 1.16 to 1.24. This makes it easy to reduce the frequency with which the inclusion is supplied to the solidification interface even when the inclusion is carried by the downward flow.
- H SEN / H 0 is preferably 0.161 to 0.327.
- the flow velocity v of the molten steel is preferably 0.441 m / s to 1.256 m / s.
- the discharge angle ⁇ of the molten steel is preferably ⁇ 45 ° to ⁇ 5 °. Thereby, it becomes easy to stabilize the flow of the molten steel in the mold and suppress the fluctuation of the molten steel surface.
- the magnetic flux density (B) of the electromagnetic brake is within the range of the above (formula 1). According to the present invention that adopts the configuration to suppress the descending speed of the molten steel and reduce the internal defects of the steel slab, while enjoying the effect of the electromagnetic brake, for producing a thin slab Even when a mold is used, it is possible to effectively avoid the occurrence of surface defects due to the electromagnetic brake.
- both the internal defect and the surface defect of the mold are reliably reduced and the cleanness of the slab by an extremely simple method of setting the electromagnetic brake to an appropriate strength according to the above (Equation 1). Can be increased.
- the immersion nozzle 2 is disposed in the vicinity of the center of the long side and the short side of the mold 1 having a substantially rectangular horizontal cross section, and as shown in FIG.
- an electromagnetic brake device 4 is disposed opposite to the height position below the lower end of the immersion nozzle 2 with the mold 1 interposed therebetween.
- the distance between the long sides that have a short side and a long side in a horizontal cross-sectional shape and are opposed to each other in the mold is set at both ends of the long side at the long side center (D max ).
- D max A funnel mold expanded from D 0
- D max> D 0 except that the horizontal swirling flow in the vicinity of the molten steel surface can be stabilized, by distancing the solidified shell from the downward flow caused by reversed near the molten steel surface, inclusions And the chance of trapping bubbles can be reduced.
- Discharge nozzles 5 for discharging molten steel obliquely downward into the mold 1 are formed in portions of the immersion nozzle 2 facing the short side walls 7a and 7b of the mold 1 respectively. Since Ar gas is blown into the immersion nozzle 2, the discharge flow 6 discharged from the discharge holes 5 includes bubbles of Ar gas, alumina and slag-based inclusions.
- the electromagnetic brake device 4 is disposed opposite to the lower end of the immersion nozzle 2 with the mold 1 in between.
- the electromagnetic brake device 4 is composed of an electromagnet or the like, and the mold width direction along the long side walls 3a and 3b of the mold 1 with respect to the discharge flow 6 immediately after being discharged from the discharge hole 5 of the immersion nozzle 2 (FIG. 1).
- a DC magnetic field having a substantially uniform magnetic flux density distribution over the X direction) can be applied in the mold thickness direction (Y direction in FIG. 1) along the short side walls 7a and 7b of the mold 1. Due to this DC magnetic field and the discharge flow, an induced current is generated in the X direction of FIG. 1, and an opposite flow opposite to the discharge flow 6 is formed in the vicinity of the discharge flow 6 by this induced current and the DC magnetic field.
- the descending speed of the molten steel is suppressed. As a result, it is possible to avoid a phenomenon that inclusions such as alumina remaining in the molten steel and bubbles penetrate into the deep part of the steel piece without being sufficiently lifted and removed.
- B min is a lower limit value of an appropriate strength range of the magnetic flux density of the electromagnetic brake, and when the magnetic flux density falls below this lower limit value, inclusions and bubbles are prevented from entering the discharge flow and entering downward.
- B max is the upper limit value of the appropriate strength range of the magnetic flux density of the electromagnetic brake. If the magnetic flux density exceeds this upper limit value, the upward flow along the immersion nozzle 2 becomes too strong. The reversing downflow also becomes strong, and the frequency of contact with the inclusions and bubbles solidified shell 8 carried by this downflow increases. As a result, surface defects are likely to occur.
- B min and B max are defined by a combination of factors that affect the flow in the mold.
- Equation 1 the first time, by combining them so as to satisfy the above (Equation 1), it is possible to reduce both the internal defects and surface defects of the mold and increase the cleanliness of the slab.
- the flow velocity v of the molten steel discharged from the immersion nozzle is preferably 0.685 m / s to 0.799 m / s.
- the molten steel flow velocity v is 0.685 m / s or more, it becomes easy to obtain a molten steel flow for suppressing the trapping of inclusions at the solidification interface.
- variation of the molten steel surface because the molten steel flow velocity v is 0.799 m / s or less.
- D max / D 0 is preferably 1.16 to 1.24.
- D max / D 0 is 1.16 or more, the upward flow is gently formed throughout, and it is easy to suppress the formation of the downward flow along the solidification interface. Further, when D max / D 0 is 1.24 or less, it becomes easy to reduce the resistance when the solidified shell is pulled out from the mold.
- D max / D 0 is more preferably 1.18 to 1.22 from the viewpoint of making the above effect remarkable.
- H SEN / H 0 is preferably 0.161 to 0.327.
- H SEN / H 0 is 0.161 or more, it becomes easy to stabilize the heat supply to the molten steel surface. Moreover, it becomes easy to suppress the fluctuation
- H SEN / H 0 is more preferably 0.15 to 0.30 from the viewpoint of making the above effects remarkable.
- the flow velocity v of the molten steel discharged from the immersion nozzle is preferably 0.441 m / s to 1.256 m / s.
- the molten steel flow velocity v is 0.441 m / s or more, a molten steel flow that suppresses trapping of inclusions is obtained, and heat supply to the molten steel surface is facilitated.
- variation of the molten steel surface because the molten steel flow velocity v is 1.256 m / s or less.
- the molten steel flow velocity v is more preferably 0.500 m / s to 1.100 m / s from the viewpoint of making the above effect remarkable.
- the discharge angle ⁇ of the molten steel is preferably ⁇ 45 ° to ⁇ 5 °.
- the discharge angle ⁇ of the molten steel is ⁇ 45 ° or more, heat supply to the molten steel surface becomes easy.
- the discharge angle ⁇ of the molten steel is ⁇ 5 ° or less, it is easy to suppress the fluctuation of the molten steel surface.
- the discharge angle ⁇ of the molten steel is more preferably ⁇ 45 ° to ⁇ 15 ° from the viewpoint of making the above effect remarkable.
- the steel was continuously cast under the casting conditions shown in Table 1 below, and the quality of the manufactured coil was evaluated. Specifically, the quality evaluation of the coil was performed by visually counting the number of sliver ⁇ for each of 50 or more coils, and ⁇ (number of ⁇ 0.5 pcs / coil), ⁇ (0. Each evaluation of 5 pieces / coil ⁇ number of hooks ⁇ 1.0 / coil) and x (number of hooks> 1.0 / coil) was given.
- the electromagnetic brake magnetic flux density is within an appropriate range, and the funnel A mold is used.
- the electromagnetic brake magnetic flux density is within an appropriate range and a funnel mold is used, other casting conditions (casting speed, casting width, bulge thickness of funnel part, and immersion nozzle conditions) It was confirmed that all showed extremely good coil quality without being affected by the above.
- Example 3 the electromagnetic brake magnetic flux density is within an appropriate range, but a rectangular mold having no funnel portion is used.
- the coil quality under these conditions was good.
- Examples 10, 17, 19, and 27 are examples in which a funnel mold was used and the casting speed was lowered while the electromagnetic brake magnetic flux density was within an appropriate range. The coil quality under these conditions was good.
- Example 22 is an example in which a funnel mold was used and the casting speed was increased while the electromagnetic brake magnetic flux density was within an appropriate range. The coil quality under these conditions was good.
- Example 25 a funnel mold was used, and the discharge angle was shallow ( ⁇ 5 °) while the electromagnetic brake magnetic flux density was within an appropriate range. The coil quality under these conditions was good.
- Comparative Examples 7 and 8 and Examples 12 to 16 are examples in which conditions other than the electromagnetic brake magnetic flux density are unified, and the appropriate range of the electromagnetic brake magnetic flux density according to the above (Equation 1) is 657 to 4795 (Gauss). is there.
- Equation 1 657 to 4795 (Gauss).
- Examples 13 to 15 it was confirmed that the electromagnetic brake magnetic flux density was within an appropriate range and far from both the upper limit value and the lower limit value, and all showed extremely good coil quality.
- the electromagnetic brake magnetic flux density was 24% smaller than the appropriate lower limit value
- Comparative Example 8 the electromagnetic brake magnetic flux density was 4% larger than the appropriate upper limit value. As for these, the coil quality was all bad x.
- Example 12 using the funnel mold is an example in which the electromagnetic brake magnetic flux density is within an appropriate range, but is close to the lower limit value compared with the electromagnetic brake magnetic flux density in Examples 13 to 15. The coil quality under these conditions was good.
- Example 16 using a funnel mold is an example in which the electromagnetic brake magnetic flux density is within an appropriate range, but is close to the upper limit value compared with the electromagnetic brake magnetic flux density in Examples 13 to 15. The coil quality under these conditions was good.
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Abstract
Description
Bmin≦B≦Bmax …(式1)
ここで、
Dmax=水平断面形状で短辺と長辺を有する鋳型の、長辺中央において、鋳型内で対向する長辺間の距離として計測される鋳型厚みの最大値(m)、
H0=溶鋼表面から電磁ブレーキコイル中心までの鉛直方向距離(m)、
HSEN=浸漬ノズル底面から電磁ブレーキコイル中心までの鉛直方向距離(m)、
v=浸漬ノズルから吐出された溶鋼の流速(m/s)、
θ=上向きを正として、水平線と成す角度として求めた、溶鋼の吐出角度(°)。
実施例10、17、19、27は、何れも、ファンネル鋳型を使用し、且つ、電磁ブレーキ磁束密度を適正範囲内としつつ、鋳造速度を低めにした例である。この条件下におけるコイル品質は何れも良好○であった。
実施例22は、ファンネル鋳型を使用し、且つ、電磁ブレーキ磁束密度を適正範囲内としつつ、鋳造速度を速めにした例である。この条件下におけるコイル品質は良好○であった。
実施例25は、ファンネル鋳型を使用し、且つ、電磁ブレーキ磁束密度を適正範囲内としつつ、吐出角度を浅め(-5°)にした例である。この条件下におけるコイル品質は良好○であった。
実施例13~15は、電磁ブレーキ磁束密度が、適正範囲で、上限値および下限値の何れからも離れたものであり、何れも、極めて良好◎なコイル品質を示すことが確認された。
比較例7は、電磁ブレーキ磁束密度が適正下限値より24%小さく、比較例8は、電磁ブレーキ磁束密度が適正上限値より4%大きかった。これらは、何れもコイル品質が不良×であった。
ファンネル鋳型を使用した実施例12は、電磁ブレーキ磁束密度を、適正範囲内であるが、実施例13~15における電磁ブレーキ磁束密度と比べると、下限値近くとした例である。この条件下におけるコイル品質は良好○であった。
ファンネル鋳型を使用した実施例16は、電磁ブレーキ磁束密度を、適正範囲内であるが、実施例13~15における電磁ブレーキ磁束密度と比べると、上限値近くとした例である。この条件下におけるコイル品質は良好○であった。
2…浸漬ノズル
3、3a、3b…長辺壁
4…電磁ブレーキ装置
5…吐出孔
6…吐出流
7a、7b…短辺壁
8…凝固シェル
9…電磁ブレーキコイル中心
Claims (8)
- 浸漬ノズルの吐出孔から吐出される吐出流に電磁ブレーキをかけながら、鋳型内へ溶鋼を供給する鋼の連続鋳造方法であって、
電磁ブレーキの磁束密度(B)を、下記(式1)の範囲とすることを特徴とする鋼の連続鋳造方法。
Bmin≦B≦Bmax …(式1)
ここで、
D0=水平断面形状で短辺と長辺を有する鋳型の、長辺両端において、鋳型内で対向する長辺間の距離として計測される鋳型厚み(m)、
Dmax=水平断面形状で短辺と長辺を有する鋳型の、長辺中央において、鋳型内で対向する長辺間の距離として計測される鋳型厚みの最大値(m)、
H0=溶鋼表面から電磁ブレーキコイル中心までの鉛直方向距離(m)、
HSEN=浸漬ノズル底面から電磁ブレーキコイル中心までの鉛直方向距離(m)、
v=浸漬ノズルから吐出された溶鋼の流速(m/s)、
θ=溶鋼の吐出角度(°)。 - 前記鋳型として、水平断面形状で短辺と長辺を有する矩形鋳型を用いることを特徴とする、請求項1に記載の鋼の連続鋳造方法。
- 前記溶鋼の流速vが0.685m/s~0.799m/sであることを特徴とする、請求項2に記載の鋼の連続鋳造方法。
- 前記鋳型として、水平断面形状で短辺と長辺を有し、かつ、鋳型内で対向する長辺間の距離を、長辺中央で長辺両端よりも拡張したファンネル鋳型を用いることを特徴とする、請求項1に記載の鋼の連続鋳造方法。
- 前記Dmax/D0が1.16~1.24であることを特徴とする、請求項4に記載の鋼の連続鋳造方法。
- 前記HSEN/H0が0.161~0.327であることを特徴とする、請求項4または5に記載の鋼の連続鋳造方法。
- 前記溶鋼の流速vが0.441m/s~1.256m/sであることを特徴とする、請求項4~6のいずれか1項に記載の鋼の連続鋳造方法。
- 前記溶鋼の吐出角度θが-45°~-5°であることを特徴とする、請求項4~7のいずれか1項に記載の鋼の連続鋳造方法。
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BR112017013367-9A BR112017013367A2 (ja) | 2015-03-31 | 2016-03-31 | A continuous casting method of steel |
CA2971130A CA2971130C (en) | 2015-03-31 | 2016-03-31 | Method for continuously casting steel |
KR1020197003844A KR20190016613A (ko) | 2015-03-31 | 2016-03-31 | 강의 연속 주조 방법 |
US15/535,439 US10259037B2 (en) | 2015-03-31 | 2016-03-31 | Method for continuously casting steel |
KR1020177016340A KR20170086574A (ko) | 2015-03-31 | 2016-03-31 | 강의 연속 주조 방법 |
EP16773164.5A EP3278906B1 (en) | 2015-03-31 | 2016-03-31 | Continuous casting method for steel |
JP2017510215A JP6428923B2 (ja) | 2015-03-31 | 2016-03-31 | 鋼の連続鋳造方法 |
CN201680004565.4A CN107107175B (zh) | 2015-03-31 | 2016-03-31 | 钢的连续铸造方法 |
US16/255,904 US10512970B2 (en) | 2015-03-31 | 2019-01-24 | Method for continuously casting steel |
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US15/535,439 A-371-Of-International US10259037B2 (en) | 2015-03-31 | 2016-03-31 | Method for continuously casting steel |
US16/255,904 Division US10512970B2 (en) | 2015-03-31 | 2019-01-24 | Method for continuously casting steel |
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CA (1) | CA2971130C (ja) |
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BR112017013367A2 (ja) | 2015-03-31 | 2018-01-09 | Nippon Steel & Sumitomo Metal Corporation | A continuous casting method of steel |
ES2920053T3 (es) * | 2017-03-03 | 2022-08-01 | Nippon Steel Stainless Steel Corp | Método de colada continua |
KR102324300B1 (ko) * | 2017-04-25 | 2021-11-09 | 제이에프이 스틸 가부시키가이샤 | 강의 연속 주조 방법 |
TW202000340A (zh) * | 2018-06-07 | 2020-01-01 | 日商日本製鐵股份有限公司 | 薄平板鑄造中的鑄模內流動控制裝置及鑄模內流動控制方法 |
CN112643007B (zh) * | 2020-11-23 | 2022-05-20 | 首钢集团有限公司 | 一种减少含铝钢铸坯表层大尺寸夹杂物的连铸方法 |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2002239691A (ja) * | 2001-02-20 | 2002-08-27 | Kawasaki Steel Corp | 溶融金属の連続鋳造方法 |
JP2009066618A (ja) * | 2007-09-13 | 2009-04-02 | Nippon Steel Corp | 鋼の連続鋳造方法 |
WO2013069121A1 (ja) * | 2011-11-09 | 2013-05-16 | 新日鐵住金株式会社 | 鋼の連続鋳造装置 |
Also Published As
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TWI590892B (zh) | 2017-07-11 |
KR20190016613A (ko) | 2019-02-18 |
CA2971130A1 (en) | 2016-10-06 |
US10512970B2 (en) | 2019-12-24 |
JP6428923B2 (ja) | 2018-11-28 |
EP3278906A1 (en) | 2018-02-07 |
JPWO2016159284A1 (ja) | 2017-09-14 |
US20190151937A1 (en) | 2019-05-23 |
US20180009026A1 (en) | 2018-01-11 |
CA2971130C (en) | 2019-08-13 |
EP3278906A4 (en) | 2018-12-05 |
EP3278906B1 (en) | 2020-04-29 |
BR112017013367A2 (ja) | 2018-01-09 |
TW201641186A (zh) | 2016-12-01 |
CN107107175B (zh) | 2020-03-24 |
US10259037B2 (en) | 2019-04-16 |
CN107107175A (zh) | 2017-08-29 |
KR20170086574A (ko) | 2017-07-26 |
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