JPH09239496A - Mold for continuously casting square billet - Google Patents
Mold for continuously casting square billetInfo
- Publication number
- JPH09239496A JPH09239496A JP5274596A JP5274596A JPH09239496A JP H09239496 A JPH09239496 A JP H09239496A JP 5274596 A JP5274596 A JP 5274596A JP 5274596 A JP5274596 A JP 5274596A JP H09239496 A JPH09239496 A JP H09239496A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- length
- vertical groove
- tube
- tube mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は鋼の連続鋳造設備に
用いる角ビレット用鋳型に関する。TECHNICAL FIELD The present invention relates to a square billet mold used in a steel continuous casting facility.
【0002】[0002]
【従来の技術】連続鋳造設備で鋼の角ビレットを鋳造す
るに際し、鋳片コーナー部に表面割れが生ずることは従
来からよく知られているが、これはコーナー部と辺部と
の抜熱量の不均一に起因するものである。2. Description of the Related Art It has been well known that surface cracks occur at the corners of a slab when a square billet of steel is cast in a continuous casting facility. This is due to non-uniformity.
【0003】すなわち、図2に示すようにチューブモー
ルド1とその外側に配置されたインナーマンテル4間の
隙間を通して流れる冷却水5によってチューブモールド
は抜熱され、モールド内溶鋼6は凝固シェルを形成して
いくが、その際、鋳片のコーナー近傍はそれを挟んだ両
辺側から冷却されるので、コーナー部の凝固シェルは辺
部に比べて早期に厚く形成される。そのため、コーナー
部に熱応力による引張力が作用するようになり、鋳片コ
ーナー部には表面割れが発生し易い。That is, as shown in FIG. 2, the tube mold is deheated by the cooling water 5 flowing through the gap between the tube mold 1 and the inner mantel 4 arranged outside the tube mold 1, and the molten steel 6 in the mold forms a solidified shell. At that time, however, since the vicinity of the corner of the cast piece is cooled from both sides sandwiching it, the solidified shell at the corner portion is thickened earlier than the side portion. Therefore, tensile force due to thermal stress acts on the corners, and surface cracks are likely to occur on the corners of the cast slab.
【0004】従って、かかる鋳片の表面割れを防止する
ためには初期凝固シェル厚をできるだけ均一化すること
が望ましい。Therefore, in order to prevent the surface cracks of the cast slab, it is desirable to make the initial solidified shell thickness as uniform as possible.
【0005】これに関して、例えば特開昭63−160
75号公報あるいは特公昭57−11735号公報に鋳
型内壁面に溝状の凹みを付け、溶鋼との接触面積を減少
させて抜熱量を低下させ、全体として緩冷却にする方法
が開示されている。In this regard, for example, JP-A-63-160
Japanese Patent Publication No. 75 or Japanese Patent Publication No. 57-11735 discloses a method in which a groove-shaped recess is formed on the inner wall surface of a mold to reduce the contact area with molten steel to reduce the amount of heat removal and to perform gentle cooling as a whole. .
【0006】[0006]
【発明が解決しようとする課題】しかしながら、特開昭
63−16075号公報あるいは特公昭57−1173
5号公報に見られる方法では単に鋳型内壁面に一様な凹
みを付けるだけであるので、コーナー部と辺部との抜熱
量に差をつけることによって初期凝固シェル厚を均一化
するという効果はなかった。However, JP-A-63-16075 or JP-B-57-1173.
According to the method disclosed in Japanese Patent Publication No. 5, only the inner wall surface of the mold is simply made to have a recess, so that the effect of making the initial solidified shell thickness uniform by making the difference in the heat removal amount between the corner portion and the side portion is not effective. There wasn't.
【0007】本発明は、コーナー部と辺部との抜熱量に
差をつけて鋳型壁温度を均一化することにより、角ビレ
ット鋳片のコーナー部と辺部との初期凝固シェルの厚み
差を小さくし、それによって鋳片コーナー部の表面割れ
を防止すると同時に、モールド下部側での抜熱量を増加
させることによって鋳片冷却を促進し、高速鋳造可能な
角ビレットの連続鋳造用鋳型を提供するものである。According to the present invention, the difference in heat removal amount between the corner portion and the side portion is made uniform to make the mold wall temperature uniform, so that the difference in thickness of the initial solidified shell between the corner portion and the side portion of the square billet slab is reduced. By reducing the size, thereby preventing surface cracks at the corners of the slab, and at the same time increasing the amount of heat removed from the lower part of the mold, slab cooling is promoted, and a continuous casting mold for square billets capable of high-speed casting is provided. It is a thing.
【0008】[0008]
【課題を解決するための手段】すなわち、本発明は、モ
ールド上部での初期凝固シェル形成段階ではコーナー部
が過冷却になり易いので、コーナー部内壁面にのみ凹み
を付け、且つ、モールド下部側では辺部外壁面に縦溝を
付けて表面積を増加させることにより、冷却を促進する
ようにすれば上記課題は解決できるとの知見に基づきな
されたもので、その骨子とするところは、鋳型のチュー
ブモールドのコーナー部の内壁面であって、四分円部を
含み両辺方向へ角ビレットの一辺の長さの0.05〜
0.2倍の範囲内に、チューブモールド上端から下方へ
長さL1が下記(1)式の範囲内の第一の縦溝を設け、該
第一の縦溝の溝深さを0.5〜1.0mm、ピッチを溝深
さの1.5〜2.5倍とし、かつチューブモールドのコ
ーナー部を除く四辺部の外壁面に、チューブモールド下
端から上方へ長さL2が下記(2)式の範囲内の第二の縦
溝を設け、該第二の縦溝の溝深さを1.0〜3.0mm、
ピッチを溝深さの1.5〜2.5倍としたことを特徴と
する、角ビレットの連続鋳造用鋳型である。That is, according to the present invention, since the corner portion is likely to be overcooled at the stage of forming the initial solidified shell on the upper portion of the mold, only the inner wall surface of the corner portion is dented, and at the lower portion of the mold. It was made based on the finding that the above problem can be solved by increasing the surface area by providing a vertical groove on the outer wall surface of the side part, and the main point is the tube of the mold. It is the inner wall surface of the corner of the mold, including the quadrant, in the direction of both sides, the length of one side of the square billet is 0.05 to
Within the range of 0.2 times, a first vertical groove having a length L 1 within the range of the following formula (1) is provided downward from the upper end of the tube mold, and the groove depth of the first vertical groove is set to 0. The length L 2 is 5 to 1.0 mm, the pitch is 1.5 to 2.5 times the groove depth, and the length L 2 is upward from the lower end of the tube mold on the outer wall surface of the four sides excluding the corners of the tube mold. A second vertical groove within the range of formula 2) is provided, and the groove depth of the second vertical groove is 1.0 to 3.0 mm,
It is a mold for continuous casting of square billets, characterized in that the pitch is 1.5 to 2.5 times the groove depth.
【0009】 L1=k1・Vc, 50≦k1≦300 ……(1) L2=H−k2・Vc, 50≦k2≦300 ……(2) ここで、L1:第一の縦溝の長さ(mm) L2:第二の縦溝の長さ(mm) H:チューブモールドの高さ(mm) Vc:連続鋳造速度 (m/min) k1,k2:比例係数 (mm/(m/min))L 1 = k 1 · Vc, 50 ≦ k 1 ≦ 300 (1) L 2 = H−k 2 · Vc, 50 ≦ k 2 ≦ 300 (2) where L 1 is : Length of one vertical groove (mm) L 2 : Length of second vertical groove (mm) H: Height of tube mold (mm) Vc: Continuous casting speed (m / min) k 1 , k 2 : Proportional coefficient (mm / (m / min))
【0010】[0010]
【発明の実施の形態】本発明に用いる鋳型のチューブモ
ールドの材質は銅もしくは銅合金であり、鋳片サイズは
主に 60 mm角から300 mm角の角ビレットを製造するもの
である。図1に本発明の鋳型のチューブモールドの例を
示す。図の上部が鋳込み方向の入側に、下部が出側に相
当する。BEST MODE FOR CARRYING OUT THE INVENTION The material of the tube mold of the mold used in the present invention is copper or a copper alloy, and the slab size is mainly for manufacturing square billets of 60 mm square to 300 mm square. FIG. 1 shows an example of a tube mold of the mold of the present invention. The upper part of the figure corresponds to the inlet side in the casting direction, and the lower part corresponds to the outlet side.
【0011】チューブモールド1の内壁面コーナー部
に、チューブモールド上端から下方へ長さL1が前記
(1)式の範囲内の第一の縦溝2を設けたのは、溶融パウ
ダーを介して溶鋼と接する面積を少なくして抜熱量を低
下させ、初期凝固シェル形成時のコーナー部の過冷却を
抑制するためで、鋳造速度Vcが大きいほど緩冷却する
範囲を大きくする必要がある。At the corner portion of the inner wall surface of the tube mold 1, the length L 1 is set downward from the upper end of the tube mold.
The provision of the first vertical groove 2 within the range of the formula (1) is to reduce the amount of heat removal by reducing the area in contact with the molten steel through the molten powder, thereby supercooling the corner portion when the initial solidified shell is formed. Therefore, it is necessary to increase the range of slow cooling as the casting speed Vc increases.
【0012】また、第一の縦溝2を付ける領域を、四分
円部を含み両辺方向へ角ビレットの一辺の長さの0.0
5〜0.2倍の範囲内としたのは、鋳片コーナー部が過
冷却の影響を受ける範囲は、通常この程度の範囲内であ
ることが経験的に分かっているためである。In addition, the area in which the first vertical groove 2 is formed includes the quadrant and is 0.02 of the length of one side of the square billet in the direction of both sides.
The reason for setting the range of 5 to 0.2 times is that it is empirically known that the range in which the slab corner is affected by supercooling is usually within this range.
【0013】第一の縦溝2の大きさを深さが0.5 〜1.0m
m 、ピッチが深さの1.5 〜2.5 倍としたのは、これより
大きいと溶融パウダーが溝の中に流入してきて、接触面
を減少するような状態が得られなくなるためである。縦
溝の大きさがこれより小さいと鋳型内壁面が溶融パウダ
ーで覆われて、溶鋼の抜熱効果が平坦な内壁面の場合と
変わらなくなるためである。前記のような縦溝の大きさ
にすれば、30〜40%の緩冷却がコーナー部で期待でき
る。The depth of the first vertical groove 2 is 0.5 to 1.0 m.
The reason for setting m and pitch to be 1.5 to 2.5 times the depth is that, if the pitch is larger than this, the molten powder will flow into the groove, and it will not be possible to obtain a state where the contact surface is reduced. This is because if the size of the vertical groove is smaller than this, the inner wall surface of the mold is covered with the molten powder, and the heat removal effect of the molten steel is the same as in the case of a flat inner wall surface. With the size of the flutes as described above, 30-40% slow cooling can be expected at the corners.
【0014】チューブモールドのコーナー部を除く四辺
部外壁面に、チューブモールド下端から上方へ長さL2
が前記(2)式の範囲内の第二の縦溝3を設けたのは、冷
却水の接触面を増加させて初期凝固シェル形成後の鋳片
冷却を促進するためである。鋳造速度Vcが大きいほど
初期凝固シェルの形成が遅れるから、第二の縦溝3の上
端の位置を下げる必要がある。On the outer wall surface of the four sides excluding the corners of the tube mold, the length L 2 is upward from the lower end of the tube mold.
The reason for providing the second vertical groove 3 within the range of the formula (2) is to increase the contact surface of the cooling water and accelerate the cooling of the slab after the initial solidified shell is formed. Since the formation of the initial solidified shell is delayed as the casting speed Vc increases, it is necessary to lower the position of the upper end of the second vertical groove 3.
【0015】第二の縦溝3の大きさを深さが1.0 〜3.0m
m 、ピッチが深さの1.5 〜2.5 倍としたのは、これより
大きいとモールドの強度低下が懸念されるためである。
また、これより小さいと鋳型外壁面の表面積を増加させ
て冷却能力を上げるという効果が薄れ、平坦な外壁面の
場合と変わらなくなるためである。前記のような縦溝の
大きさにすれれば、20〜40%の冷却能力の向上が期待で
きる。The size of the second vertical groove 3 has a depth of 1.0 to 3.0 m.
The m and pitch are set to 1.5 to 2.5 times the depth, because if it is larger than this, the strength of the mold may decrease.
On the other hand, if it is smaller than this, the effect of increasing the surface area of the outer wall surface of the mold to improve the cooling capacity is weakened, and it is the same as in the case of a flat outer wall surface. If the size of the vertical groove is as described above, it is expected that the cooling capacity will be improved by 20 to 40%.
【0016】なお、縦溝の形状としては、通常は正三角
形状とするが、三角形状、矩形状、正方形状あるいは円
弧状でも構わない。また、ここでいうコーナー部とは、
コーナーの四分円部で表される曲線部のみを意味するの
ではなく、それに続く直線部の一部を含む場合も意味す
る。The shape of the vertical groove is usually an equilateral triangle, but may be a triangle, a rectangle, a square or an arc. Also, the corner section here is
It does not mean only the curved portion represented by the quadrant of the corner, but also the case where it includes a part of the straight portion that follows.
【0017】[0017]
【発明の効果】本発明の鋳型を用いることにより、初期
凝固シェル形成時にコーナー部が緩冷却となり、初期凝
固シェル厚が均一化する。また、その後の鋳片冷却速度
が速くなるので、高速鋳造が可能となる。EFFECTS OF THE INVENTION By using the mold of the present invention, the corner portion is gradually cooled when the initial solidified shell is formed, and the initial solidified shell thickness is made uniform. Further, since the slab cooling rate thereafter becomes faster, high-speed casting becomes possible.
【図1】本発明の鋳型のチューブモールドの例を示す
図。FIG. 1 is a view showing an example of a tube mold of a mold of the present invention.
【図2】角ビレット用連続鋳造設備に用いる一般的なモ
ールドを示す図。FIG. 2 is a view showing a general mold used in a continuous casting facility for square billets.
1 チューブモールド 2 チューブモールド内壁面コーナー部の第一の縦溝 3 チューブモールド外壁面の第二の縦溝 4 インナーマンテル 5 冷却水 6 溶鋼 1 Tube Mold 2 First Vertical Groove on Inner Wall Corner of Tube Mold 3 Second Vertical Groove on Outer Wall of Tube Mold 4 Inner Mantel 5 Cooling Water 6 Molten Steel
Claims (1)
内壁面であって、四分円部を含み両辺方向へ角ビレット
の一辺の長さの0.05〜0.2倍の範囲内に、チュー
ブモールド上端から下方へ長さL1が下記(1)式の範囲
内の第一の縦溝を設け、該第一の縦溝の溝深さを0.5
〜1.0mm、ピッチを溝深さの1.5〜2.5倍とし、
かつチューブモールドのコーナー部を除く四辺部の外壁
面に、チューブモールド下端から上方へ長さL2が下記
(2)式の範囲内の第二の縦溝を設け、該第二の縦溝の溝
深さを1.0〜3.0mm、ピッチを溝深さの1.5〜
2.5倍としたことを特徴とする、角ビレットの連続鋳
造用鋳型。 L1=k1・Vc, 50≦k1≦300 ……(1) L2=H−k2・Vc, 50≦k2≦300 ……(2) ここで、L1:第一の縦溝の長さ(mm) L2:第二の縦溝の長さ(mm) H:チューブモールドの高さ(mm) Vc:連続鋳造速度 (m/min) k1,k2:比例係数 (mm/(m/min))1. A tube which is an inner wall surface of a corner portion of a tube mold of a mold, and which includes a quadrant within a range of 0.05 to 0.2 times the length of one side of a square billet in the direction of both sides. A first vertical groove having a length L 1 within the range of the following formula (1) is provided downward from the upper end of the mold, and the groove depth of the first vertical groove is 0.5.
~ 1.0 mm, pitch 1.5 ~ 2.5 times the groove depth,
Also, on the outer wall surface of the four sides excluding the corners of the tube mold, the length L 2 is as follows from the lower end of the tube mold upwards.
A second vertical groove within the range of the formula (2) is provided, the groove depth of the second vertical groove is 1.0 to 3.0 mm, and the pitch is 1.5 to the groove depth.
A mold for continuous casting of square billets, which is characterized by being 2.5 times. L 1 = k 1 · Vc, 50 ≦ k 1 ≦ 300 (1) L 2 = H−k 2 · Vc, 50 ≦ k 2 ≦ 300 (2) where L 1 is the first vertical Groove length (mm) L 2 : Second vertical groove length (mm) H: Tube mold height (mm) Vc: Continuous casting speed (m / min) k 1 , k 2 : Proportional coefficient ( mm / (m / min))
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5274596A JPH09239496A (en) | 1996-03-11 | 1996-03-11 | Mold for continuously casting square billet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5274596A JPH09239496A (en) | 1996-03-11 | 1996-03-11 | Mold for continuously casting square billet |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09239496A true JPH09239496A (en) | 1997-09-16 |
Family
ID=12923464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5274596A Withdrawn JPH09239496A (en) | 1996-03-11 | 1996-03-11 | Mold for continuously casting square billet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09239496A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1332811A2 (en) * | 2002-01-31 | 2003-08-06 | KM Europa Metal Aktiengesellschaft | Mould pipe |
US6918428B2 (en) * | 2002-08-29 | 2005-07-19 | Km Europa Metal Ag | Chill tube |
US20120186772A1 (en) * | 2011-01-25 | 2012-07-26 | Craig Shaber | Thermal management system for a continuous casting molten metal mold |
CN103958093A (en) * | 2012-04-19 | 2014-07-30 | Kme德国有限及两合公司 | Mould for the continuous casting of metals |
-
1996
- 1996-03-11 JP JP5274596A patent/JPH09239496A/en not_active Withdrawn
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1332811A2 (en) * | 2002-01-31 | 2003-08-06 | KM Europa Metal Aktiengesellschaft | Mould pipe |
EP1332811A3 (en) * | 2002-01-31 | 2003-08-20 | KM Europa Metal Aktiengesellschaft | Mould pipe |
US6918428B2 (en) * | 2002-08-29 | 2005-07-19 | Km Europa Metal Ag | Chill tube |
CN1313227C (en) * | 2002-08-29 | 2007-05-02 | Km欧洲钢铁股份有限公司 | Crystallizer tube |
US20120186772A1 (en) * | 2011-01-25 | 2012-07-26 | Craig Shaber | Thermal management system for a continuous casting molten metal mold |
CN103958093A (en) * | 2012-04-19 | 2014-07-30 | Kme德国有限及两合公司 | Mould for the continuous casting of metals |
US9393614B2 (en) | 2012-04-19 | 2016-07-19 | Kme Germany Gmbh & Co. Kg | Mould for the continuous casting of metals |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030603 |