WO2010052906A1 - 鋼の連続鋳造用装置 - Google Patents
鋼の連続鋳造用装置 Download PDFInfo
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- WO2010052906A1 WO2010052906A1 PCT/JP2009/005861 JP2009005861W WO2010052906A1 WO 2010052906 A1 WO2010052906 A1 WO 2010052906A1 JP 2009005861 W JP2009005861 W JP 2009005861W WO 2010052906 A1 WO2010052906 A1 WO 2010052906A1
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- WIPO (PCT)
- Prior art keywords
- mold
- molten steel
- immersion nozzle
- curved
- gas bubbles
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000005266 casting Methods 0.000 title claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 38
- 238000007654 immersion Methods 0.000 claims description 55
- 238000009749 continuous casting Methods 0.000 claims description 32
- 230000004907 flux Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 66
- 238000005452 bending Methods 0.000 description 18
- 230000005499 meniscus Effects 0.000 description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 11
- 239000010949 copper Substances 0.000 description 11
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 230000000630 rising effect Effects 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
Images
Classifications
-
- 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
- B22D11/043—Curved 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
- B22D11/10—Supplying or treating 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
- B22D11/10—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
- B22D11/10—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
Definitions
- the present invention relates to a steel continuous casting apparatus that supplies molten steel into a mold to produce a slab.
- This application claims priority based on Japanese Patent Application No. 2008-282981 for which it applied to Japan on November 04, 2008, and uses the content here.
- a DC magnetic field is applied to molten steel discharged into a mold. It is known that a counter flow opposite to the main flow is generated around the discharge flow of the molten steel in the DC magnetic field.
- an immersion nozzle 102 that discharges molten steel 100 into a mold 101 is used.
- two downward discharge holes 103 with respect to the horizontal direction are formed.
- molten steel 100 is discharged in the casting_mold
- non-oxidizing gas for example, Ar gas (argon gas).
- the Ar gas bubbles 106 ride on the counterflow 105 rising along the immersion nozzle 102 and concentrate around the immersion nozzle 102 and float up to the meniscus 107, the meniscus 107 may not be completely removed. In that case, a part of the Ar gas bubbles 106 is trapped by the solidified shell 108 formed on the inner surface of the mold 101. As a result, the number of Ar gas bubbles 106 on the slab surface layer on which the molten steel 100 is cast increases.
- the Ar gas bubbles 106 in the region 110 remain on the surface of the slab, causing a reduction in the strength of the slab and a surface defect of the slab, so there is room for improvement in the quality of the slab. there were.
- the present invention has been made in view of the above circumstances, and provides an apparatus for continuous casting of steel capable of reducing Ar gas bubbles contained in a continuously cast slab and improving the quality of the slab. With the goal.
- a continuous casting apparatus for steel according to the present invention includes a casting mold for molten steel having a pair of long side walls and a pair of short side walls; an immersion nozzle for discharging the molten steel into the mold; An electromagnetic stirrer that is disposed along the upper part of the molten steel in the mold; and is disposed below the electromagnetic stirrer and is uniformly distributed in the mold width direction along the long side walls.
- An electromagnetic brake device that applies a direct-current magnetic field in the mold thickness direction along each of the short side walls, and at least a position facing the immersion nozzle on each of the long side walls.
- a horizontal distance between the top of the curved portion and the immersion nozzle in plan view is 35 mm or more and less than 50 mm.
- the long side wall of the mold is formed with a curved portion at least at a position opposed to the immersion nozzle, there is a gap between the curved portion and the immersion nozzle.
- a curved region can be formed. This curved region can be made wider by a curved portion than the region formed between the conventional flat wall and the immersion nozzle, so that Ar gas bubbles rising in the molten steel diffuse along the outer periphery of the immersion nozzle. The area that can be expanded.
- the horizontal distance between the top of the curved portion and the immersion nozzle is less than 35 mm in plan view, it becomes difficult for molten steel to flow in the curved region, and Ar gas bubbles in the molten steel are trapped in the solidified shell. It becomes easy to be done. Further, when the horizontal distance is 50 mm or more, it is difficult to ensure a uniform flow of the molten steel in the curved region, and Ar gas bubbles in the molten steel are easily captured by the solidified shell in a region where the flow rate of the molten steel is low.
- the curved region is formed so that the horizontal distance is 35 mm or more and less than 50 mm, even if Ar gas bubbles in the molten steel rising along the immersion nozzle diffuse, Ar Gas bubbles can rise to the meniscus. Therefore, Ar gas bubbles can be prevented from being trapped by the solidified shell on the long side wall of the mold. Moreover, since the said horizontal distance can be ensured by a curved area, the stirring flow of the molten steel formed with an electromagnetic stirring apparatus becomes easy to flow in this curved area. As a result, it is possible to further suppress Ar gas bubbles from being stirred and trapped in the solidified shell at the upper part of the mold. As described above, since the trapping of the Ar gas bubbles in the solidified shell can be suppressed, the Ar gas bubbles contained in the slab can be reduced, and the quality of the slab can be improved.
- the bending portion may be configured by bending the entire long side wall outward.
- the curved portion is formed on each inner side surface of each long side wall; and each outer side surface of each long side wall is a flat surface.
- the distance between the bending portion and the electromagnetic stirring device is the distance between the long side wall other than the bending portion and the electromagnetic stirring device. Shorter than the distance between. If it does so, the molten steel in the curved area
- Ar gas bubbles in the molten steel in the curved region can be sufficiently stirred, even if Ar gas bubbles rise along the outer periphery of the immersion nozzle, the Ar gas bubbles in the curved region are captured by the solidified shell. Can be further suppressed.
- the Ar gas bubbles contained in the slab can be reduced, and the quality of the slab can be improved.
- FIG. 2 is a diagram showing a schematic configuration in the vicinity of the mold of the continuous casting apparatus, and is a longitudinal sectional view taken along arrow AA in FIG. 1.
- FIG. 2 is a diagram showing a schematic configuration in the vicinity of the mold of the continuous casting apparatus, and is a longitudinal sectional view taken along the line BB in FIG. 1. It is a figure explaining the flow of the molten steel of a mold upper part when operating the electromagnetic stirring apparatus of the continuous casting apparatus, Comprising: It is a plane sectional view equivalent to FIG.
- FIG. 1 It is a figure explaining a DC magnetic field when operating the electromagnetic brake device of the same continuous casting device, and is a plane sectional view equivalent to FIG. It is a figure for demonstrating the flow of a DC magnetic field, an induced current, and a counterflow when the electromagnetic brake device is operated, Comprising: It is sectional drawing equivalent to the upper part of FIG. It is a longitudinal cross-sectional view which shows schematic structure of the mold vicinity of the conventional continuous casting apparatus. It is a figure which shows schematic structure of the mold vicinity, Comprising: It is a plane sectional view in CC view of FIG. It is a figure which shows schematic structure of the mold vicinity, Comprising: It is a longitudinal cross-sectional view in the DD arrow of FIG.
- FIG. 1 is a plan sectional view showing the configuration in the vicinity of the mold of the continuous casting apparatus 1 for steel according to the present embodiment
- FIGS. 2 and 3 are longitudinal sectional views showing the configuration in the vicinity of the casting mold of the continuous casting apparatus 1.
- the continuous casting apparatus 1 has a mold 2 having a rectangular cross section, for example.
- the mold 2 has a pair of long side walls 2a and a pair of short side walls 2b.
- the long side wall 2a is composed of a copper plate 3a provided on the inner side and a stainless steel box 4a provided on the outer side.
- the short side wall 2b is comprised from the copper plate 3b provided in the inner side, and the stainless steel box 4b provided in the outer side.
- the length Lf (casting thickness) of the short side wall 2b is, for example, about 50 mm to 300 mm.
- the required slab width is about 50 mm to 80 mm for a thin slab, about 80 mm to 150 mm for a medium slab, and 150 mm to about a normal slab. It is about 300 mm.
- the horizontal direction along the long side wall 2a (X direction in FIGS. 1 to 3) is referred to as the mold width direction, and the horizontal direction along the short side wall 2b (Y direction in FIGS. 1 to 3). It is called the mold thickness direction.
- a curved portion 5 that is curved toward the stainless steel box 4a side (outside of the mold 2) is formed at the center portion along the mold width direction of the inner surface of the copper plate 3a of the long side wall 2a.
- the curved portion 5 is formed at a position facing an immersion nozzle 6 (described later) provided in the mold 2.
- the bending part 5 is formed so that it may overlap with the immersion nozzle 6 toward the downward direction from the upper end of the copper plate 3a, when it sees with the longitudinal cross-sectional view shown in FIG.2 and FIG.3.
- the lower end position of the bending portion 5 may be the same height as the lower end position of the immersion nozzle 6 or may be formed to be lower than the lower end position of the immersion nozzle 6.
- the curved portion 5 is formed, for example, by cutting the inner surface of the copper plate 3a into a concave curved surface.
- a curved region 7 is formed between the curved portion 5 and the immersion nozzle 6 as shown in FIG.
- the horizontal distance L 1 between the curved top of the curved portion 5 and the immersion nozzle 6 when the mold 2 is viewed in plan is from the viewpoint of securing a distance at which the Ar gas bubbles 11 described later are not captured by the solidified shell 26.
- the distance is preferably equal to or greater than a predetermined distance, for example, 35 mm or more is recommended.
- the horizontal distance L 1 is recommended to be less than 50 mm. This is because, when the horizontal distance L 1 is 50mm or more, in the curved region 7 becomes difficult to secure the uniform flow of the molten steel 8, the flow rate of the molten steel 8 is slow, Ar gas bubbles 11 in the molten steel 8 is solidified This is because the shell 26 is easily captured.
- the bending distance L 2 of the bending portion 5 (the shortest horizontal distance between the bending top and both ends of the bending portion 5 and the cutting depth when forming the bending portion 5) is the above and not the horizontal distance L 1 is particularly defined as long as possible to ensure a predetermined distance, also in accordance with the thickness dimension of the external diameter and the mold 2 of the immersion nozzle 6, as appropriate, it is determined.
- the curved distance L 2 of the curved portion 5 from the viewpoint of less susceptible to distortion upon withdrawal of the slab, preferably as small.
- the difference (L 1 ⁇ L 2 ) between the horizontal distance L 1 and the bending distance L 2 is less than a predetermined distance (for example, less than 40 mm).
- the outer side surface 3a1 of the copper plate 3a of the long side wall 2a and both side surfaces 4a1 of the stainless steel box 4a are formed flat.
- an immersion nozzle 6 is provided in the upper part of the mold 2.
- the lower part of the immersion nozzle 6 is immersed in the molten steel 8 in the mold 2.
- two discharge holes 9 for discharging the molten steel 8 obliquely downward into the mold 2 are formed. These discharge holes 9 are formed so as to face the short side wall 2 b of the mold 2.
- the discharge flow 10 discharged from each discharge hole 9 includes Ar gas bubbles 11 for cleaning the inside of the immersion nozzle 6.
- a pair of electromagnetic stirring devices 20 such as electromagnetic stirring coils are provided at a height position near the meniscus 12, as shown in FIGS. It has been.
- the electromagnetic stirring device 20 is disposed so as to be parallel to both side surfaces 4a1 of the stainless steel box 4a.
- the molten steel 8 near the meniscus 12 in the mold 2 is swung in a horizontal plane by the electromagnetic stirring of the electromagnetic stirring device 20 (that is, the molten steel 8 in a plan view is moved into the immersion nozzle 6.
- the stirring flow 21 can be formed.
- the curved region 7 is formed wider than the conventional region formed by a flat wall body that is linear when viewed in plan.
- the flow of the molten steel does not stagnate between the long side wall and the immersion nozzle as in the conventional case, and the stirring flow 21 flows along the inner surfaces of the long side wall 2a and the short side wall 2b.
- the distance D 1 between the curved top portion of the bending portion 5 and the electromagnetic stirring device 20 when the mold 2 is viewed in plan is the distance between the inner surface of the copper plate 3 a other than the bending portion 5 and the electromagnetic stirring device 20. It is shorter than the distance D 2.
- the curved region 7 is not narrowed as a flow path for the stirring flow 21, and the molten steel 8 in the curved region 7 is closer to the electromagnetic stirring device 20, so that the curved region 7 is more easily stirred than before.
- a pair of electromagnetic brake devices 22 such as electromagnets are provided below the electromagnetic stirring device 20 as shown in FIG.
- the center line position (position of the maximum magnetic flux density) of the electromagnetic brake device 22 is located below the discharge hole 9 of the immersion nozzle 6.
- the electromagnetic brake device 22 is provided outside the long side wall 2 a of the mold 2.
- the electromagnetic brake device 22 has a mold width direction along the inner surface of the long side wall 2 a of the mold 2 with respect to the discharge flow 10 of the molten steel 8 immediately after being discharged from the discharge hole 9.
- a DC magnetic field 23 having a substantially uniform magnetic flux density distribution over (in the X direction in FIG. 5) is applied in the mold thickness direction (Y direction in FIG.
- the solidified shell 26 which the molten steel 8 cooled and solidified is formed in the inner surface of the casting_mold
- the continuous casting apparatus 1 is configured as described above. Next, the continuous casting method of the molten steel 8 using this continuous casting apparatus 1 is demonstrated.
- molten steel 8 is discharged into the mold 2 from the discharge hole 9 of the immersion nozzle 6 while blowing Ar gas into the immersion nozzle 6. Since the molten steel 8 is discharged obliquely downward from the discharge hole 9, a discharge flow 10 from the discharge hole 9 toward the short side wall 2b of the mold 2 is formed.
- the discharge flow 10 includes Ar gas bubbles 11, and the Ar gas bubbles 11 float in the molten steel 8 in the mold 2.
- the electromagnetic brake device 22 is operated. Due to the DC magnetic field 23 formed by the electromagnetic brake device 22, a counter flow 25 opposite to the flow of the discharge flow 10 is formed. The counter flow 25 rises toward the meniscus 12 after colliding with the immersion nozzle 6. Then, the Ar gas bubbles 11 floating in the molten steel 8 also float on the counter flow 25 to the vicinity of the meniscus 12.
- the electromagnetic stirring device 20 is also operated. Due to the electromagnetic stirring by the electromagnetic stirring device 20, a stirring flow 21 is formed in the molten steel 8 near the meniscus 12 in the mold 2. Then, the Ar gas bubbles 11 that have risen up to the vicinity of the meniscus 12 on the counter flow 25 swirl around the immersion nozzle 6 by the stirring flow 21 and are not captured by the solidified shell 26 of the mold 2, for example, molten oxide. Is taken in and removed by continuous casting powder (not shown).
- the molten steel 8 from which the Ar gas bubbles 11 have been removed in this way is then solidified and cast into a slab.
- the curved region 7 is formed between the curved portion 5 and the immersion nozzle 6 by forming the curved portion 5 at the upper center position of the long side wall 2a of the mold 2. . Since the horizontal distance L 1 is secured by the curved region 7, even when Ar gas bubbles 11 which rises along the submerged entry nozzle 6 riding counterflow 25 are diffused, the Ar gas bubbles 11 can floating up the meniscus 12 . Therefore, the Ar gas bubbles 11 can be moved away from the solidified shell 26 formed on the inner surface of the long side wall 2 a of the mold 2, and can be prevented from being captured by the solidified shell 26. That is, as shown in FIGS.
- the curved portion 5 is a curved concave surface that spreads from the lower position of the immersion nozzle 6 toward the upper side in the vertical direction, so that the immersion nozzle 6 and the long side walls 2 a
- two curved regions 7 having a shape spreading from the lower position of the immersion nozzle 6 toward the upper side in the vertical direction are formed.
- the horizontal distance L 1 is secured by the formation of such a curved region 7, in the curved region 7, it stirred flow 21 formed by the electromagnetic stirring device 20 tends to flow.
- the Ar gas bubbles 11 can be suppressed from being trapped by the solidified shell 26 in this way, the Ar gas bubbles 11 contained in the slab can be reduced, and the quality of the slab can be improved.
- the curved part 5 is formed in the inner surface of the copper plate 3a of the long side wall 2a, and the outer surface of the copper plate 3a is formed in the flat surface, it is between the curved top part of the curved part 5, and the electromagnetic stirring apparatus 20.
- the distance D 1 is shorter than the distance D 2 between the inner surface of the copper plate 2 a outside the curved portion 5 and the electromagnetic stirring device 20.
- the Ar gas bubbles 11 in the molten steel 8 in the curved region 7 can be sufficiently stirred in the mold 2, even if the Ar gas bubbles 11 rise along the outer peripheral surface of the immersion nozzle 6, the curved region 7 Ar gas bubbles 11 can be further suppressed from being trapped by the solidified shell 26.
- a counter magnetic field 25 is formed in the opposite direction to the vicinity of the discharge flow 10 discharged from the discharge hole 9 into the mold 2 by applying the DC magnetic field 23 by the electromagnetic brake device 22.
- the mold 2 of the continuous casting apparatus 1 one having a width dimension of 1200 mm, a height dimension of 900 mm, and a thickness dimension of 250 mm was used.
- a vertical portion (not shown) having a length dimension of 2.5 m and a bending portion (not shown) having a bending radius of 7.5 m are provided in this order from the top.
- the electromagnetic stirring device 20 has a height dimension of 150 mm and a thrust of 100 mm Fe, and its upper end is provided at the same height as the meniscus 12.
- the electromagnetic brake device 22 is provided so that the center line position (that is, the position of the maximum magnetic flux density) is a position 500 mm deep from the meniscus 12.
- a low-carbon aluminum killed steel was used as the molten steel 8, and the steel was cast at a casting speed of 2 m / min (0.033 m / sec).
- the center position of the discharge hole 9 of the immersion nozzle 6 is equally provided at a depth position of 300 mm from the meniscus 12.
- a circular discharge hole 9 is formed in the immersion nozzle 6 at two locations so as to face the short side wall 2 b side of the mold 2.
- the diameter of the discharge hole 9 is 60 mm, and the discharge angle ⁇ of the discharge hole 9 is 30 degrees downward from the horizontal plane when viewed in the longitudinal section of FIG. Further, the discharge directions of the two discharge holes 9 are opposite to each other by 180 degrees around the center line of the immersion nozzle 6 when viewed in plan.
- steel is cast under five conditions of 30 mm, 35 mm, 40 mm, 45 mm, and 50 mm as the horizontal distance L 1 between the curved top portion of the curved portion 5 of the mold 2 and the immersion nozzle 6. Went.
- the horizontal distance L 1 of 30mm the curved distance L 2 of the curved portion 5 0 mm, is changed to 5 mm, if the horizontal distance L 1 is greater than or equal 35mm corresponds to a change in the horizontal distance L 1 Te, changing the curved distance L 2 5 mm, 10 mm, 15 mm, to 20 mm.
- the curved distance L 2 is 0 mm, shows the state where no curved portion 5 is formed in the long side wall 2a of the mold 2.
- the number of Ar bubbles 11 and inclusions having a diameter of 100 ⁇ m or more included in the surface layer having a depth of 50 mm from the surface thereof was measured. This is to confirm that Ar bubbles and inclusions having a diameter of 100 ⁇ m or more contained in a surface layer having a depth of 50 mm from the surface of the slab affect the quality of the slab.
- Table 1 shows the results of casting under the above conditions.
- Ar gas bubbles number indicator as 1 horizontal distance L 1 is curved distance L 2 a 30mm is 0mm number of Ar gas bubbles in a case where (i.e. does not form a curved portion 5), the conditions
- inclusions number indicator as 1 the number of inclusions in a case curved distance L 2 is the horizontal distance L 1 a 30mm is 0 mm, and the ratio of the number of inclusions in each condition.
- the technical scope of the present invention is not limited to the above-described embodiments, but includes those in which various modifications are made to the above-described embodiments without departing from the spirit of the present invention. That is, the specific processing, configuration, and the like given in this embodiment are merely examples, and can be changed as appropriate.
- the curved portions 5 may be formed by curving the entire long side walls 2 a outward of the mold 2.
- an apparatus for continuous casting of steel capable of reducing Ar gas bubbles contained in a continuously cast slab and improving the quality of the slab.
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Abstract
Description
本願は、2008年11月04日に、日本国に出願された特願2008-282981号に基づき優先権を主張し、その内容をここに援用する。
(1)本発明の鋼の連続鋳造装置は、一対の長辺壁及び一対の短辺壁を有する溶鋼鋳造用の鋳型と;この鋳型内に溶鋼を吐出する浸漬ノズルと;前記各長辺壁に沿って配置され、前記鋳型内の前記溶鋼の上部を攪拌する電磁攪拌装置と;この電磁攪拌装置の下方に配置され、前記各長辺壁に沿った鋳型幅方向に一様な磁束密度分布を有する直流磁界を、前記各短辺壁に沿った鋳型厚み方向に付与する電磁ブレーキ装置と;を備え、前記各長辺壁に、少なくとも前記浸漬ノズルに対向する位置に、前記電磁攪拌装置側に湾曲した湾曲部が形成され;平面視した場合の前記湾曲部の頂部と前記浸漬ノズルとの間の水平距離が、35mm以上かつ50mm未満である。
ところで、本発明者らが調べたところ、単に湾曲領域を形成しただけでは、Arガス気泡が鋳型の長辺壁の凝固シェルに捕捉されるのを抑制できないことが分かった。具体的には、平面視した場合に湾曲部の頂部と浸漬ノズルとの間の水平距離が35mm未満であると、湾曲領域において溶鋼が流れ難くなり、溶鋼中のArガス気泡が凝固シェルに捕捉され易くなる。また、前記水平距離が50mm以上であると、湾曲領域における溶鋼の均一な流れが確保し難くなって、溶鋼の流速が遅い領域では、溶鋼中のArガス気泡が凝固シェルに捕捉され易くなる。この点、本発明によれば、前記水平距離が35mm以上かつ50mm未満になるように湾曲領域が形成されるため、浸漬ノズルに沿って上昇する溶鋼中のArガス気泡が拡散しても、Arガス気泡はメニスカスまで浮上できる。したがって、Arガス気泡が鋳型の長辺壁の凝固シェルに捕捉されるのを抑制することができる。また、湾曲領域により前記水平距離を確保できるため、この湾曲領域において、電磁攪拌装置により形成される溶鋼の攪拌流が流れ易くなる。その結果、鋳型上部においてArガス気泡が攪拌され、凝固シェルに捕捉されるのをさらに抑制することができる。このように、Arガス気泡の凝固シェルでの捕捉を抑制できるので、鋳片に含まれるArガス気泡を減少させることができ、鋳片の品質を向上させることができる。
上記(2)で、前記湾曲部を前記各長辺壁の内側面に形成した場合には、湾曲部と電磁攪拌装置との間の距離は、湾曲部以外の各長辺壁と電磁攪拌装置との間の距離よりも短くなる。そうすると、湾曲部と浸漬ノズルとの間の湾曲領域にある溶鋼は攪拌され易くなる。したがって、湾曲領域の溶鋼中のArガス気泡を十分に攪拌することができるので、浸漬ノズルの外周に沿ってArガス気泡が浮上しても、湾曲領域のArガス気泡が凝固シェルに捕捉されるのをさらに抑制することができる。
図1は、本実施形態にかかる鋼の連続鋳造装置1の鋳型近傍の構成を示す平断面図であり、図2及び図3は、同連続鋳造装置1の同鋳型近傍の構成を示す縦断面図である。
連続鋳造装置1は、図1に示すように、例えば平断面が長方形の鋳型2を有している。この鋳型2は、一対の長辺壁2aと一対の短辺壁2bとを有している。長辺壁2aは、内側に設けられた銅板3aと、外側に設けられたステンレス製ボックス4aとから構成されている。また、短辺壁2bは、内側に設けられた銅板3bと、外側に設けられたステンレス製ボックス4bとから構成されている。なお、本実施形態において、短辺壁2bの長さLf(鋳造厚み)は、例えば50mm~300mm程度である。
一方、要求される鋳片幅としては、薄幅鋳片であれば50mm~80mm程度であり、中厚幅鋳片であれば80mm~150mm程度であり、通常幅の鋳片であれば150mm~300mm程度である。
また、長辺壁2aに沿った水平方向(図1~図3中のX方向)を鋳型幅方向といい、短辺壁2bに沿った水平方向(図1~図3中のY方向)を鋳型厚み方向という。
湾曲部5は、鋳型2内に設けられた浸漬ノズル6(後述)に対向した位置に形成されている。また、湾曲部5は、図2及び図3に示す縦断面図で見た場合に、銅板3aの上端から下方に向かってかつ、浸漬ノズル6と重なるように形成されている。湾曲部5の下端位置は、浸漬ノズル6の下端位置と同じ高さでもよく、または浸漬ノズル6の下端位置よりも下方位置になるように形成されていてもよい。なお、湾曲部5は、例えば銅板3aの内側面を凹曲面状に削ることにより形成される。そして、この湾曲部5と浸漬ノズル6との間に、図1に示すように湾曲領域7が形成される。
なお、鋳型2を平面視した場合の湾曲部5の湾曲頂部と浸漬ノズル6との間の水平距離L1は、後述のArガス気泡11が凝固シェル26に捕捉されない距離を確保するという観点から、所定の距離以上とすることが好ましく、例えば35mm以上であることが推奨される。この理由は、水平距離L1が35mm未満であると、湾曲領域7において溶鋼8が流れ難くなり、溶鋼8中のArガス気泡11が凝固シェル26に捕捉され易くなるためである。また、水平距離L1は、50mm未満であることが推奨される。この理由は、水平距離L1が50mm以上であると、湾曲領域7において溶鋼8の均一な流れを確保し難くなって、溶鋼8の流速が遅くなり、溶鋼8中のArガス気泡11が凝固シェル26に捕捉され易くなるためである。
また、湾曲部5の湾曲距離L2(湾曲部5における前記湾曲頂部と両端部との間の最短水平距離であってかつ、湾曲部5を形成する際の削り込み深さ)は、上記の水平距離L1が所定の距離を確保できていれば特に規定されるものではなく、また、浸漬ノズル6の外径寸法や鋳型2の厚み寸法に応じて、適宜、決定される。但し、湾曲部5の湾曲距離L2は、鋳片の引抜きに際して歪みを受け難くするという観点から、小さいほど好ましい。なお、本実施形態においては、上記の水平距離L1と湾曲距離L2との差(L1-L2)は、所定の距離未満(例えば40mm未満)となっている。また、長辺壁2aの銅板3aの外側面3a1とステンレス製ボックス4aの両側面4a1は、平坦に形成されている。
この電磁攪拌装置20の電磁攪拌により、図4に示すように、鋳型2内のメニスカス12近傍にある溶鋼8を水平面内で旋回させて(すなわち、平面視した場合の溶鋼8を、浸漬ノズル6を中心に旋回させて)、攪拌流21を形成することができる。ところで、湾曲領域7は、従来の、平面視した場合に直線状をなす平らな壁体により形成される領域よりも、湾曲した分、広く形成されている。そのため、従来のように長辺壁と浸漬ノズルとの間で溶鋼の流れが停滞することがなく、攪拌流21は、長辺壁2a及び短辺壁2bの内側面に沿って浸漬ノズル6の回りを旋回する。また、鋳型2を平面視した場合の湾曲部5の前記湾曲頂部と電磁攪拌装置20との間の距離D1は、湾曲部5以外の銅板3aの内側面と電磁攪拌装置20との間の距離D2よりも短くなる。その結果、湾曲領域7は、攪拌流21の流路としては狭くならない上に、この湾曲領域7にある溶鋼8は電磁攪拌装置20に近いため、従来よりも攪拌され易くなる。
電磁ブレーキ装置22は、図5に示すように、鋳型2の長辺壁2aの外側に設けられている。電磁ブレーキ装置22は、図5及び図6に示すように、吐出孔9から吐出した直後の溶鋼8の吐出流10に対して、鋳型2の長辺壁2aの内側面に沿った鋳型幅方向(図5中のX方向)に亘ってほぼ一様な磁束密度分布を有する直流磁界23を、鋳型2の短辺2bの内側面に沿った鋳型厚み方向(図5中のY方向)に付与する。この直流磁界23と吐出孔9から吐出した溶鋼8の吐出流10とによって、図6に示すように、鋳型2の長辺壁2aの内側面に沿った鋳型幅方向(図6中のX方向)に誘導電流24が発生する。そして、この誘導電流24と直流磁界23とによって、吐出流10の近傍に、この吐出流10と逆向きの対向流25が形成される。対向流25は、吐出流10の吐出角度とほぼ同じ角度で浸漬ノズル6に向かって衝突し、さらに浸漬ノズル6の外周面に沿ってメニスカス12まで上昇する。
そして、このような湾曲領域7の形成により前記水平距離L1が確保されるため、この湾曲領域7において、電磁攪拌装置20により形成される攪拌流21が流れ易くなる。その結果、鋳型2の上部においてArガス気泡11が攪拌され、凝固シェル26に捕捉されるのをさらに抑制することができる。このようにしてArガス気泡11が凝固シェル26で捕捉されるのを抑制できるので、鋳片に含まれるArガス気泡11を減少させることができ、鋳片の品質を向上させることができる。
電磁攪拌装置20は、高さ寸法が150mm、推力が100mmFeであり、その上端がメニスカス12と同一の高さ位置に設けられている。
電磁ブレーキ装置22は、その中心線位置(すなわち最大磁束密度の位置)が、メニスカス12から500mm深さの位置となるように設けられている。
溶鋼8には低炭アルミキルド鋼を用い、鋳造速度2m/分(0.033m/秒)の条件で鋼の鋳造を行った。
浸漬ノズル6には、外径が150mmで、内径が90mmのノズルを用いた。浸漬ノズル6の吐出孔9の中心位置は、メニスカス12から300mmの深さ位置に等しく設けられている。浸漬ノズル6には円形の吐出孔9が鋳型2の短辺壁2b側に向くように2箇所に形成されている。吐出孔9の直径は60mmであり、吐出孔9の吐出角度θは、図2の縦断面で見た場合に水平面から下向きに30度である。また、2つの吐出孔9の吐出方向は、これを平面視した場合に、浸漬ノズル6の中心線を中心として互いに180度の逆向きとなっている。
また、水平距離L1が30mmの場合には、湾曲部5の湾曲距離L2を0mm、5mmに変化させ、水平距離L1が35mm以上の場合には、水平距離L1の変化に対応して、湾曲距離L2を5mm、10mm、15mm、20mmに変化させた。なお、湾曲距離L2が0mmとは、鋳型2の長辺壁2aに湾曲部5が形成されていない状態を示す。
そして、鋳造された鋳片において、その表面から深さ50mmの表層に含まれる100μm以上の径を有するAr気泡11と介在物の個数を計測した。これは、鋳片の表面から深さ50mmの表層に含まれる100μm以上の径を有するAr気泡および介在物が、鋳片の品質に影響することを確認するためである。
また、水平距離L1が50mmである場合には、湾曲距離L2を20mmにして湾曲部5を形成しても、Arガス気泡個数指標が1に極めて近くなると共に、介在物個数指標が1より大きくなった。よって、Arガス気泡と介在物の個数を十分に減少させることができないことが分かった。
例えば、本発明の鋼の連続鋳造装置では、前記各長辺壁2aの全体を鋳型2の外側に湾曲させて前記湾曲部5を形成してもよい。
2 鋳型
2a 長辺壁
2b 短辺壁
3a、3b 銅板
4a、4b ステンレス製ボックス
5 湾曲部
6 浸漬ノズル
7 湾曲領域
8 溶鋼
9 吐出孔
10 吐出流
11 Arガス気泡
12 メニスカス
20 電磁攪拌装置
21 攪拌流
22 電磁ブレーキ装置
23 直流磁界
24 誘導電流
25 対向流
26 凝固シェル
Claims (2)
- 一対の長辺壁及び一対の短辺壁を有する溶鋼鋳造用の鋳型と;
この鋳型内に溶鋼を吐出する浸漬ノズルと;
前記各長辺壁に沿って配置され、前記鋳型内の前記溶鋼の上部を攪拌する電磁攪拌装置と;
この電磁攪拌装置の下方に配置され、前記各長辺壁に沿った鋳型幅方向に一様な磁束密度分布を有する直流磁界を、前記各短辺壁に沿った鋳型厚み方向に付与する電磁ブレーキ装置と;
を備え、
前記各長辺壁に、少なくとも前記浸漬ノズルに対向する位置に、前記電磁攪拌装置側に湾曲した湾曲部が形成され;
平面視した場合の前記湾曲部の頂部と前記浸漬ノズルとの間の水平距離が、35mm以上かつ50mm未満である;
ことを特徴とする鋼の連続鋳造装置。 - 前記湾曲部が前記各長辺壁の各内側面に形成され;
前記各長辺壁の各外側面が平坦面である;
ことを特徴とする請求項1に記載の鋼の連続鋳造用装置。
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