WO2010119680A1 - 連続鋳造設備 - Google Patents
連続鋳造設備 Download PDFInfo
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- WO2010119680A1 WO2010119680A1 PCT/JP2010/002718 JP2010002718W WO2010119680A1 WO 2010119680 A1 WO2010119680 A1 WO 2010119680A1 JP 2010002718 W JP2010002718 W JP 2010002718W WO 2010119680 A1 WO2010119680 A1 WO 2010119680A1
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- WIPO (PCT)
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- slab
- roll
- support
- rolls
- continuous casting
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
Definitions
- the present invention relates to a continuous casting facility provided with a plurality of support rolls arranged to face each other across a slab passage.
- a continuous casting facility for producing a slab from molten metal is provided with a slab passage for passing a slab drawn from a tundish through a mold, a pair of rolls arranged opposite to each other across the slab passage, and the like. .
- a plurality of support rolls for guiding the slab are arranged side by side in the casting direction of the slab.
- Each support roll is rotatably provided with a central axis extending in the width direction of the slab as a rotation center axis, and the slab is supported in a state in which the slab is sandwiched by these support rolls while the slab is supported in a predetermined casting direction. Pull out to transport.
- Each support roll rotates with the movement of the slab, whereby the slab is smoothly guided.
- the distance between the support rolls on the downstream side is set to the distance between the support rolls on the upstream side at a position where the solid fraction of the slab corresponds to 0.3 to 0.9 during continuous casting. It is also proposed to make it smaller (Patent Document 2).
- bulging may not be sufficiently suppressed only by dividing the support roll into a plurality of divided rolls. For example, an unsupported portion where the roll does not contact the slab exists between the split rolls adjacent to each other in the slab width direction in one support roll. It was found that even if the interval between the divided rolls was made constant, the bulging amount could or might not be suppressed at the non-supported portion, and sufficient bulging suppression was not always achieved. This bulging caused central segregation, which is an internal defect of the slab, and deteriorated the slab quality.
- the present invention has been made in view of such a point, and an object thereof is to reduce the bulging amount of a slab and suppress the center segregation of the slab.
- a continuous casting facility is a continuous casting facility including a plurality of support rolls arranged to face each other across a passage of a slab, and each of the support rolls Has a plurality of divided rolls arranged along the width direction of the slab, and the center solid phase ratio of the slab during the continuous casting process is 0.2 or more and less than 1.0.
- An interval between the divided rolls adjacent to each other in the width direction of the slab in the support roll is defined as an interval A (mm), and the downstream of the support roll in the casting direction.
- the distance A and the distance B are the following formulas (1) and (2) Meet.
- the center segregation of the slab can be suppressed by reducing the bulging amount of the slab.
- Drawing 1 is an explanatory view showing the outline of the composition of continuous casting equipment 1 concerning this embodiment.
- the continuous casting facility 1 includes a tundish 2 for storing molten steel, a nozzle 4 for injecting molten steel into the mold 3 from the bottom of the tundish 2, and a slab through which a slab H drawn from the mold 3 passes.
- a pair of roll groups 6 and 7 are provided so as to face each other across the passage 5 and the slab passage 5.
- the inner peripheral roll group 6 includes a plurality of support rolls 10 that guide the inner peripheral side of the slab H in the slab passage 5.
- Each supporting roll 10, the center axis thereof so as to face in the width direction of the slab H, are arranged in a row along the casting direction D 1.
- the outer peripheral side roll group 7 has a plurality of support rolls 11 for guiding the outer peripheral side of the slab H in the slab passage 5.
- Each supporting roll 11 has its central axis so as to face in the width direction of the slab H, are arranged in a row along the casting direction D 1.
- the support rolls 10 and 11 are attached to a roll segment device 20 as shown in FIGS.
- the roll segment device 20 includes an inner peripheral frame 21 to which a plurality of inner peripheral support rolls 10 are attached, and an outer peripheral frame 22 to which a plurality of outer peripheral support rolls 11 are attached.
- a support member for supporting the inner peripheral side frame 21 and the outer peripheral side frame 22 between the inner peripheral side frame 21 and the outer peripheral side frame 22 and adjusting the distance between the support rolls 10 and 11. 23 is provided.
- the support member 23 is provided with a hydraulic cylinder 24.
- a cylinder rod or a cylindrical body is used as the support member 23.
- the structure which adjusts the length of the supporting member 23 by a screwing form is preferable.
- a configuration in which the screw portion is divided into two parts, or a configuration in which the screw portion is disposed between the support member 23 and the outer frame 22 can be adopted.
- a plurality in the width direction D 2 of the slab H for example, three split rolls 30a, 30b, are divided into 30c.
- Each divided rolls 30 forms a substantially cylindrical shape, is inserted through the shaft 31 extending in the slab width direction D 2 in its center.
- Each divided roll 30 and the shaft 31 may have a one-piece structure or a separate structure.
- the shaft 31 may be divided in the axial direction by the intermediate bearing portion 33. With this configuration, the split roll 30 can rotate around the shaft 31. End bearing portions 32 are provided at both ends of the shaft 31. Further, the shaft 31 between the split rolls 30 is provided with an intermediate bearing portion 33 (see FIG. 2). When the shaft 31 is divided in the axial direction by the intermediate bearing portion 33, two bearings are arranged in the intermediate bearing portion 33.
- the end bearing portion 32 and the intermediate bearing portion 33 are supported by the frame 21 on the inner peripheral side.
- the distance B (mm) between the support rolls adjacent to each other in the casting direction with respect to one support roll is In a plan view as shown in FIG. 4, it is defined as the distance of the center portion of each roll.
- the center segregation is performed by adjusting the interval between the divided rolls adjacent to each other in the width direction of the slab in one support roll to an appropriate range corresponding to the interval in the casting direction between the support rolls.
- the suppression effect is significantly improved. That is, in order to sufficiently suppress the amount of bulging that causes center segregation, it is not sufficient to adjust the split roll arrangement one-dimensionally as in the past, and the support roll arrangement and the split roll are two-dimensionally adjusted. It turns out that the arrangement needs to be adjusted.
- the support rolls adjacent to each other in the casting direction of the one support roll (as viewed from the one support roll described above) centered on the unsupported portion of the cast piece between the divided rolls adjacent to each other in the width direction of the cast piece.
- Deformation of a two-dimensional flat plate (slab) in a range over a support roll adjacent to the front in the casting direction, and a support roll adjacent to the rear in the casting direction as viewed from the one support roll; was analyzed and the amount of bulging was evaluated. Then, from the relationship between the bulging amount and the center segregation, the above formula (1) was derived as a condition for sufficiently suppressing the center segregation.
- the upper limit value in the above formula (2) is set to 680 mm.
- 400 mm which is the lower limit in the above formula (2) was determined as the minimum interval at which the support rolls can actually be installed in the continuous casting facility.
- the support roll (divided roll) is arranged in the continuous casting equipment of the present invention so as to satisfy the above formulas (1) and (2). For this reason, the amount of bulging of a slab can be made small and the center segregation of this slab can fully be suppressed.
- the central solid fraction can be defined as the solid fraction of the molten portion in the center of the slab thickness direction and in the slab width direction.
- the central solid phase ratio can be determined by heat transfer / solidification calculation.
- As the heat transfer / solidification calculation an enthalpy method, an equivalent specific heat method, or the like is widely known, and any method may be used. For simplicity, the following equation is widely known, and this equation may be used.
- Central solid fraction (liquidus temperature-melt temperature) / (liquidus temperature-solidus temperature)
- the melting part temperature means the temperature of the melting part in the center part in the slab thickness direction and in the slab width direction, and can be obtained by heat transfer / solidification calculation.
- liquidus temperature refers to, for example, “Akane and Steel, Nippon Steel Association, Vol. 55, No. 3 (19690227) S85, Japan Iron and Steel Institute”.
- the temperature can be calculated with reference to, for example, “Hirai, Kanamaru, Mori; Gakken 19 Committee, Fifth Solidification Phenomenon Council Material, Solidification 46 (December 1968)”.
- the split rolls 30 are arranged in a so-called zigzag shape (catch stitch shape). That is, the gaps between the divided rolls are arranged in a zigzag so that they are not aligned in a line along the casting direction.
- segmentation which comprises the support roll 10a
- non-supporting band length B The distance (interval) B between the support rolls 10b and 10c on both sides of 1 (hereinafter sometimes referred to as “non-supporting band length B”) satisfies the following expressions (1) and (2). Is set to Detailed description of these formulas (1) and (2) will be described later. Note that the minimum value of the non-supporting band width A is, for example, about 100 mm as a value at which the split roll 30 can be actually installed.
- A ⁇ 0.001 ⁇ B 2 ⁇ 1.5 ⁇ B + 735 (1) 400 ⁇ B ⁇ 680 (2)
- A is divided rolls 30a adjacent to the slab width direction D 2 in the support rolls 10a, between 30b spacing (mm)
- B is the support roll 10b on both sides of the casting direction D 1 of the supporting roller 10a, 10c The distance between them (mm).
- the support roll 11 on the outer peripheral side also has a plurality of, for example, three divided rolls 40 a, 40 b , and 40 c in the width direction D 2 of the slab H, like the support roll 10 on the inner peripheral side. It is divided into Each divided rolls 40 forms a substantially cylindrical shape, is inserted through the shaft 41 extending in the slab width direction D 2 in its center. Each split roll 40 and shaft 41 may have a separate structure or a separate structure. The shaft 41 may be divided in the axial direction by the intermediate bearing portion 43. With this configuration, the split roll 40 can rotate around the shaft 41. End bearing portions 42 are provided at both ends of the shaft 41. An intermediate bearing 43 is provided on the shaft 41 between the split rolls 40.
- the shaft 41 When the shaft 41 is divided in the axial direction by the intermediate bearing portion 43, two bearings are required for the intermediate bearing portion 43.
- the end bearing portion 42 and the intermediate bearing portion 43 are supported by the frame 22 on the outer peripheral side.
- the planar arrangement of the divided rolls 40 is the same as the planar arrangement of the inner circumferential divided rolls 30 described in FIG. That is, the support roll 11 and the division
- molten steel stored in the tundish 2 is injected into the mold 3 through the nozzle 4.
- the molten steel is cooled from the outer periphery and solidified to form a slab H.
- the slab H is drawn from the mold 3 to the slab passage 5 and is moved downstream along the casting direction D 1 while being guided by the roll groups 6 and 7.
- the distance between the support rolls 10 and 11 in the roll groups 6 and 7 is adjusted by the roll segment device 20 so that the slab H has a predetermined thickness.
- the slab H is further cooled while passing through the slab passage 5 and solidifies to the inside.
- the deformation amount in the slab thickness direction (hereinafter referred to as “bulging amount”) of the two-dimensional flat plate (non-supporting band S) extending to the supporting rolls 10b and 10c is analyzed using a finite element method, and the bulging amount is calculated. evaluated. Evaluation of the bulging amount was performed in the roll group 6 at a position where the central solid phase ratio of the slab H corresponds to 0.8. This central solid phase ratio is in the range of 0.2 or more and less than 1.0.
- This central solid fraction has been separately confirmed that when the central solid fraction of the slab H is 0.2 or more and less than 1.0, bulging of the slab H occurs and central segregation occurs. Therefore, it was set as the representative value. Further, in the non-supporting band S, the bulging amount was evaluated by changing the non-supporting band width A in a range of 400 mm or less and changing the non-supporting band length B in 450 mm, 560 mm, 600 mm, 640 mm, and 680 mm. .
- the evaluation results of the bulging amount are shown in FIG.
- the horizontal axis of FIG. 5 indicates the non-supporting band width A.
- the vertical axis in FIG. 5 indicates the ratio of the bulging amount when the unsupported band width A is 0 mm and the unsupported band length B is 560 mm, and the bulging amount is defined as 1. is doing.
- the non-support band width A of 0 mm means a case where the support roll is not divided.
- the non-supporting band length B is 280 mm, for the sake of convenience, the non-supporting band length B is expressed as 560 mm even when the non-supporting band width A is 0 mm for comparison with the case where the support roll is divided. ing.
- the non-supporting band width A is 0 mm and the supporting roll is not divided, there is a problem that bulging occurs due to the bending of the supporting roll as described above.
- the case where the non-supporting band width A and the non-supporting band length B are changed the case where the non-supporting band width A is 0 mm is used as a reference when the bulging amount is the smallest.
- the support roll could be operated without bending.
- the relationship between the unsupported band width A and the unsupported band length B that satisfies the bulging index of 2.8 or less was obtained. That is, when the unsupported band length B was varied, the unsupported band width A at which the bulging index was 2.8 or less was determined.
- the unsupported band width A and the unsupported band length B in this range were plotted as shown in FIG. Then, the plot in FIG. 6 was approximated by a polynomial to derive the relational expression of the above formula (1).
- the non-supporting band length B is 680 mm or more, even if the non-supporting band width A is reduced, the non-supporting band length B is too large, so that the center segregation is entirely observed. It turned out to be worse. Further, when the non-support band width A is 0 mm (that is, when a non-divided support roll is used), the bulging index is 2.0 or more (the range above the thin dotted line in FIG. 5), and the center segregation is sufficient. It was also found that it was not possible to suppress it. Therefore, in the above formula (2), the upper limit value of the unsupported belt length B is set to 680 mm. Incidentally, 400 mm which is the lower limit in the formula (2) is determined on the basis that the actual installed smallest possible spacing of the casting direction D 1 to the adjacent support rolls 10 and 11 in a continuous casting machine 1 is 200mm ing.
- the support rolls 10 and 11 split rolls 30 and 40
- the bulging amount of the slab H passing through the slab passage 5 can be reduced. Therefore, the center segregation of the slab H can be sufficiently suppressed, and a high quality slab can be manufactured.
- the apparatus of 1 aspect of this invention can also be described as follows: It is a continuous casting installation provided with two or more support rolls arrange
- a support roll at a position where the center solid phase ratio of the slab is equal to or greater than 0.2 and less than 1.0 during continuous casting the slab is divided into a plurality of divided rolls in the direction.
- the interval A between the adjacent divided rolls and the interval B between the adjacent support rolls in the casting direction between the divided rolls adjacent in the slab width direction satisfy the above formula (1) and the above formula (2).
- the present invention is useful for a continuous casting facility provided with a plurality of support rolls arranged to face each other across a slab passage.
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Abstract
Description
本願は、2009年4月14日に、日本に出願された特願2009-097681号に基づき優先権を主張し、その内容をここに援用する。
A≦0.001×B2-1.5×B+735・・・・(1)
400≦B<680・・・・(2
なお、上記式(2)において下限値である400mmは、連続鋳造設備において支持ロールを実際に設置可能な最小の間隔として決定した。
また、中心固相率は、伝熱・凝固計算によって求めることができ、伝熱・凝固計算としては、エンタルピー法や等価比熱法などが広く知られており、いずれの方法を用いても良い。また、簡易的には、下記の式が広く知られており、この式を用いても良い。
中心固相率=(液相線温度-溶融部温度)/(液相線温度-固相線温度)
ここで、溶融部温度とは、鋳片厚み方向の中心部で、かつ、鋳片幅方向の溶融部分の温度を意味しており、伝熱・凝固計算によって求めることができる。また、液相線温度は、例えば、「鐵と鋼、日本鐡鋼協會々誌、Vol.55、No.3(19690227)S85、社団法人日本鉄鋼協会」を参照して、また、固相線温度は、例えば、「平居、金丸、森;学振19委、第5回凝固現象協議会資料、凝固46(1968年12月)」を参照して、それぞれ算出することができる。
A≦0.001×B2-1.5×B+735・・・・(1)
400≦B<680・・・・(2)
但し、Aは支持ロール10a中の鋳片幅方向D2に隣り合う分割ロール30a、30b間の間隔(mm)であり、Bは支持ロール10aの鋳造方向D1の両隣の支持ロール10b、10c間の間隔(mm)である。
また、非支持帯幅Aが0mmで支持ロールが分割されていない場合、実際には前述の通り、支持ロールがたわむことによりバルジングが生じるという問題がある。しかし、ここでは、非支持帯幅Aおよび非支持帯長さBを変化させた場合の検討を行う際に、非支持帯幅Aが0mmの場合をバルジング量が最も少ない場合の基準とするために、支持ロールがたわむことなく操業できるものと仮定した。
ここで、非支持帯幅Aが0mm、かつ非支持帯長さBが560mmにおけるバルジング量を基準としたのは、分割されていない支持ロール(A=0mm)を用いる場合に、通常、設定されている鋳造方向D1の支持ロール間隔が280mm程度であることに基づいている。そこで、発明者らが調べたところ、バルジング指数が2.8以下であると鋳片Hの中心偏析を十分に抑制できることが分かった。すなわち、図5中の太い点線より下の範囲が中心偏析を抑制できる範囲であることが分かった。
2 タンディッシュ
3 鋳型
4 ノズル
5 鋳片通路
6、7 ロール群
10、11 支持ロール
20 ロールセグメント装置
21、22 フレーム
23 支持部材
24 油圧シリンダ
30、40 分割ロール
31、41 シャフト
32、42 端部軸受部
33、43 中間軸受部
H 鋳片
S 非支持帯
Claims (1)
- 鋳片の通路を挟んで対向配置される複数の支持ロールを備えた連続鋳造設備であって、
それぞれの前記支持ロールは、前記鋳片の幅方向に沿って配置された複数の分割ロールを有し、
連続鋳造工程中の前記鋳片の中心固相率が0.2以上かつ1.0未満となる前記通路上の位置に配置された前記各支持ロールについて:
前記支持ロール中の前記鋳片の前記幅方向で隣り合う前記分割ロール間の間隔を間隔A(mm)と定義し、
前記支持ロールの鋳造方向下流側の隣の支持ロールから前記支持ロールの鋳造方向上流側の隣の支持ロールまでの距離を距離B(mm)と定義したとき、間隔A及び距離Bが、
A≦0.001×B2-1.5×B+735・・・・(1)
および
400≦B<680・・・・(2)
を満たすことを特徴とする連続鋳造設備。
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CN2010800160617A CN102387878B (zh) | 2009-04-14 | 2010-04-14 | 连续铸造设备 |
JP2011509217A JP4880089B2 (ja) | 2009-04-14 | 2010-04-14 | 連続鋳造設備 |
BRPI1015033-1A BRPI1015033B1 (pt) | 2009-04-14 | 2010-04-14 | máquina de lingotamento contínuo |
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JP2009-097681 | 2009-04-14 | ||
JP2009097681 | 2009-04-14 |
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WO2010119680A1 true WO2010119680A1 (ja) | 2010-10-21 |
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CN (1) | CN102387878B (ja) |
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JP2016078083A (ja) * | 2014-10-17 | 2016-05-16 | 新日鐵住金株式会社 | 連続鋳造用鋳片圧下装置及び連続鋳造方法 |
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JP5522324B1 (ja) * | 2012-07-31 | 2014-06-18 | Jfeスチール株式会社 | 鋼の連続鋳造方法 |
ES2653556T3 (es) * | 2013-05-02 | 2018-02-07 | Nippon Steel & Sumitomo Metal Corporation | Equipo de colada continua |
CN112371937A (zh) * | 2020-10-30 | 2021-02-19 | 五矿营口中板有限责任公司 | 一种改善超厚板坯包晶钢中心偏析的方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH03110049A (ja) * | 1989-09-25 | 1991-05-10 | Sumitomo Metal Ind Ltd | 連続鋳造用分割ロールの軸受装置 |
JPH08290251A (ja) * | 1995-04-20 | 1996-11-05 | Nippon Steel Corp | 鋼の連続鋳造装置および連続鋳造方法 |
JP2001025850A (ja) * | 1999-07-15 | 2001-01-30 | Kobe Steel Ltd | 連続鋳造設備 |
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JP2721382B2 (ja) * | 1989-01-31 | 1998-03-04 | 新日本製鐵株式会社 | 鋼鋳片の組識微細化方法 |
JP3002071B2 (ja) * | 1992-12-28 | 2000-01-24 | 新日本製鐵株式会社 | 薄スラブ連鋳機におけるスプリットロール |
-
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- 2010-04-14 CN CN2010800160617A patent/CN102387878B/zh active Active
- 2010-04-14 BR BRPI1015033-1A patent/BRPI1015033B1/pt active IP Right Grant
- 2010-04-14 JP JP2011509217A patent/JP4880089B2/ja active Active
- 2010-04-14 WO PCT/JP2010/002718 patent/WO2010119680A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03110049A (ja) * | 1989-09-25 | 1991-05-10 | Sumitomo Metal Ind Ltd | 連続鋳造用分割ロールの軸受装置 |
JPH08290251A (ja) * | 1995-04-20 | 1996-11-05 | Nippon Steel Corp | 鋼の連続鋳造装置および連続鋳造方法 |
JP2001025850A (ja) * | 1999-07-15 | 2001-01-30 | Kobe Steel Ltd | 連続鋳造設備 |
Cited By (1)
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JP2016078083A (ja) * | 2014-10-17 | 2016-05-16 | 新日鐵住金株式会社 | 連続鋳造用鋳片圧下装置及び連続鋳造方法 |
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JP4880089B2 (ja) | 2012-02-22 |
CN102387878A (zh) | 2012-03-21 |
CN102387878B (zh) | 2013-11-27 |
JPWO2010119680A1 (ja) | 2012-10-22 |
BRPI1015033A2 (pt) | 2016-04-12 |
BRPI1015033B1 (pt) | 2021-02-02 |
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