JPS6144586B2 - - Google Patents
Info
- Publication number
- JPS6144586B2 JPS6144586B2 JP10048780A JP10048780A JPS6144586B2 JP S6144586 B2 JPS6144586 B2 JP S6144586B2 JP 10048780 A JP10048780 A JP 10048780A JP 10048780 A JP10048780 A JP 10048780A JP S6144586 B2 JPS6144586 B2 JP S6144586B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molten steel
- cooling water
- wall
- slab
- 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.)
- Expired
Links
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
- B22D11/045—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for horizontal casting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
この発明は、鋼の水平連続鋳造において、鋳型
内溶鋼の冷却凝固時における熱流束のアンバラン
スによる鋳片の化学成分や治金的組織の偏析およ
び鋳片の変形等を防止し、品質の優れた鋳片の製
造を行なうことができる水平連続鋳造方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION In horizontal continuous casting of steel, the present invention aims to solve problems such as segregation of the chemical composition and metallurgical structure of the slab and deformation of the slab due to imbalance of heat flux during cooling and solidification of molten steel in the mold. The present invention relates to a horizontal continuous casting method that can prevent this and produce slabs of excellent quality.
鋼の水平連続鋳造は、タンデイツシユの側壁下
部に、フイードノズルを介して水平方向に設けら
れた鋳型から鋳片を連続的に引出し、前記鋳型に
連なる二次冷却帯で冷却し製造される。 Horizontal continuous casting of steel is produced by continuously drawing a slab from a mold horizontally installed at the lower part of the side wall of a tundish through a feed nozzle, and cooling it in a secondary cooling zone connected to the mold.
第１図には、水平連続鋳造機におけるタンデイ
ツシユに設けられた鋳型部分が断面図により、第
２図には第１図のＡ−Ａ線断面図により示されて
いる。図面において、１はタンデイツシユの側壁
で、鉄皮１ａと、鉄皮１ａの内側に配置した耐火
物１ｂとからなつている。２は側壁１の下部に設
けられた溶鋼流出口で、シーテイングリング３
と、シーテイングリング３の内面に設けられたフ
イードノズル嵌合用の凹部をもつフロントノズル
４とからなつている。 FIG. 1 shows a sectional view of a mold part provided in a tundish in a horizontal continuous casting machine, and FIG. 2 shows a sectional view taken along the line A--A in FIG. In the drawings, reference numeral 1 denotes a side wall of the tundish, which is made up of a steel shell 1a and a refractory 1b placed inside the steel shell 1a. 2 is a molten steel outlet provided at the bottom of the side wall 1, and a seating ring 3
and a front nozzle 4 having a recess provided on the inner surface of the seating ring 3 for fitting a feed nozzle.
５は前記フロントノズル４の凹部に嵌合された
フイールドノズルで、その端部にはブレークリン
グ６を介して鋳型７が設けられる。従つてタンデ
イツシユ内の溶鋼は、フロントノズル４、フイー
ドノズル５、およびブレークリング６を通して鋳
型７に供給される。８は鋳型７の外周に設けられ
た鋳型７の冷却用チエンバー、９は冷却チヤネル
である。 A field nozzle 5 is fitted into the recess of the front nozzle 4, and a mold 7 is provided at the end of the field nozzle through a break ring 6. Therefore, the molten steel in the tundish is supplied to the mold 7 through the front nozzle 4, the feed nozzle 5, and the break ring 6. 8 is a cooling chamber for the mold 7 provided around the outer periphery of the mold 7, and 9 is a cooling channel.
鋳型７に供給される溶鋼は、鋳型７内に直ちに
冷却されて鋳型７と接触する部分から凝固し、シ
エル１０が生成されつつ鋳型７から第１図におい
て右方向に引抜かれ、凝固層が発達して鋳片１１
となる。 The molten steel supplied to the mold 7 is immediately cooled in the mold 7 and solidifies from the part that comes into contact with the mold 7, and is drawn out from the mold 7 to the right in FIG. 1 while a shell 10 is generated, and a solidified layer develops. Slab 11
becomes.
ところで、上記した鋳型から鋳片を引抜く際に
問題となるのは、鋳型内に流入した溶鋼は、その
自重と溶鋼静圧とによつて、鋳型の下面側に押し
つけられながら、凝固し収縮することである。従
つて、鋳型内周面と凝固シエルとの密着度は、鋳
型下面側では大であるが、一方、鋳型上面側およ
び側面側では、収縮により生ずるギヤツプの作用
もあり、その密度は小となる。 By the way, the problem when pulling a slab out of the above-mentioned mold is that the molten steel that has flowed into the mold solidifies and shrinks while being pressed against the lower surface of the mold due to its own weight and the static pressure of the molten steel. It is to be. Therefore, the degree of adhesion between the inner circumferential surface of the mold and the solidified shell is large on the bottom side of the mold, but on the other hand, the density is small on the top and side surfaces of the mold due to the effect of gaps caused by shrinkage. .
溶鋼および凝固シエルから鋳型への伝熱は、主
として輻射（約105kcal/m2・h）、および伝熱（約
106kcal/m2・h）によつてなされるが、前記したギ
ヤツプの発生により、伝熱が妨げられ、初期表層
凝固生成部における熱の流れ（熱流束）は、鋳型
の下面側に大きく、上面側および側面側では小と
なり、アンバランスが生ずる。この局所的に大き
な伝熱点（ホツトスポツト）では、熱流束が約
107kcal/m2・hにも達する結果、鋳型内の上部と下
部における溶鋼の凝固速度および温度分布に差が
生ずる。 Heat transfer from the molten steel and solidified shell to the mold is mainly done by radiation (approx. 10 5 kcal/m 2 h) and heat transfer (approx.
10 6 kcal/m 2 h), but due to the generation of the gap described above, heat transfer is hindered, and the heat flow (heat flux) in the initial surface solidification generation area is largely directed toward the lower surface of the mold. , becomes small on the top side and the side side, causing an imbalance. At these locally large heat transfer points (hot spots), the heat flux is approximately
As a result, the solidification rate and temperature distribution of molten steel in the upper and lower parts of the mold differ.
第３図は鋳型７内の温度分布パターンを、鋳型
上部７ａ側と鋳型下部７ｂ側とに分けて示した図
で、Ａは冷却水入口温度、Ｂは冷却水出口の平均
温度、Ｃは鋳型温度、Ｄは凝固シエル表面温度、
Ｅは溶鋼温度を、またａは冷却水温度上昇を、ｂ
は冷却水境膜温度差を、ｃはギヤツプ温度差を
夫々示している。 Fig. 3 is a diagram showing the temperature distribution pattern inside the mold 7 divided into the mold upper part 7a side and the mold lower part 7b side, where A is the cooling water inlet temperature, B is the average temperature at the cooling water outlet, and C is the mold temperature, D is the surface temperature of the solidified shell,
E is the molten steel temperature, a is the cooling water temperature rise, and b
indicates the cooling water film temperature difference, and c indicates the gap temperature difference.
同図から明らかなように、溶鋼→凝固シエル→
ギヤツプ→鋳型→冷却流体という熱の流路につい
て、総括熱貫流係数即ち熱流束は、矢印の如く、
鋳型７の上部７ａ側においては小であり、下部７
ｂ側においては大となる。その結果鋳片１１に
は、一点鎖線で示す如き下方へ垂れる曲りが発生
し、また鋳片の化学成分や治金的組織に偏析が生
ずる問題があつた。 As is clear from the figure, molten steel → solidified shell →
Regarding the heat flow path from gap to mold to cooling fluid, the overall heat transfer coefficient, or heat flux, is as shown by the arrow,
The upper part 7a side of the mold 7 is small, and the lower part 7
It becomes large on the b side. As a result, the slab 11 was bent downward as shown by the dashed line, and there was also the problem of segregation in the chemical composition and metallurgical structure of the slab.
また最近、第４図に側面図で、第５図に第３図
Ａ−Ａ線断面図で示す如く、円周面に凹部１３が
形成された回転するドラム状鋳型１２と、前記ド
ラム状鋳型１２の下部周面上に、前記凹部１３を
覆うような状態を接触しながら、ドラム状鋳型１
２の回転と共に移動する耐熱、可撓性を有する無
端ベルト１４とからなる回転鋳型を使用し、前記
ドラム状鋳型１２の円周面に形成された凹部１３
内に、無端ベルト１４の一方端から溶鋼を注入
し、前記凹部１３内で凝固されつつ、他方端から
鋳片１１として抽出する回転鋳型を使用した鋳造
方法も知られている。 Recently, as shown in FIG. 4 in a side view and FIG. 5 as a sectional view taken along the line A-A in FIG. The drum-shaped mold 1 is placed in contact with the lower peripheral surface of the mold 12 so as to cover the recess 13.
A recess 13 formed on the circumferential surface of the drum-shaped mold 12 is used.
A casting method using a rotary mold is also known, in which molten steel is injected from one end of the endless belt 14, solidified in the recess 13, and extracted as slabs 11 from the other end.
この方法によれば、鋳型の回転と共に鋳片の引
抜きが行なわれるから、鋳型と鋳片との摩擦を無
くすことができるが、その反面次のような問題が
あつた。 According to this method, since the slab is pulled out as the mold rotates, friction between the mold and the slab can be eliminated, but on the other hand, the following problems occur.
(1) 溶鋼を回転鋳型に注入する際、溶鋼を空気か
らシールすることが困難であり、フイードノズ
ルの構造が複雑となる。もし少しでも空気が溶
鋼中に混入すると、溶鋼静圧がたたなくなり、
表面酸化が生ずる。またシールが不完全である
と、溶鋼の外部漏出が生ずる。(1) When pouring molten steel into a rotary mold, it is difficult to seal the molten steel from air, making the structure of the feed nozzle complicated. If even a small amount of air gets mixed into the molten steel, the static pressure of the molten steel will no longer build up.
Surface oxidation occurs. Also, if the seal is incomplete, molten steel may leak out.
(2) 高温で作動する可動機構が必要であり、操業
中に故障が発生しやすく、保守に多大の手間を
要する。(2) It requires a movable mechanism that operates at high temperatures, is prone to breakdowns during operation, and requires a great deal of effort to maintain.
(3) 凝固シエルが発達した時点で鋳片を回転鋳型
から離脱させる工程が必要となるため、そのと
きの鋳片の曲げにより、シエルが破断し、ある
いは鋳型の金属組織の不整や真直度に対し悪影
響が生ずる等のおそれがある。(3) Once the solidified shell has developed, it is necessary to remove the slab from the rotary mold, so the bending of the slab at that time may cause the shell to break, or the metal structure of the mold to be irregular or straight. However, there is a risk that adverse effects may occur.
(4) 造塊形状に制約が多く、複雑な形状のもの特
に無端ベルトと接触する面が平面でないもの、
例えば丸ビレツト等の鋳造は困難である。(4) There are many restrictions on the shape of the agglomerate, especially those with a complex shape, especially those whose surface in contact with the endless belt is not flat,
For example, it is difficult to cast round billets.
この発明は、上述のような観点から、水平連続
鋳造において鋳型から表層が凝固しつつある鋳片
を引抜くに当り、鋳型内溶鋼の冷却凝固時におけ
る熱流束のアンバランスによる鋳片の化学成分や
治金的組織の偏析および鋳片の変形等を防止し、
品質の優れた鋳片をブレークアウトが発生せず、
効率高く製造することができる水平連続鋳型方法
を提供するもので、鋳型内に流入した溶鋼の初期
凝固生成部付近における鋳型上部壁に、前記鋳型
上部壁のみを直接冷却する冷却水循環通路を設
け、鋳型下部壁は冷却水循環通路を設けずに熱溜
め部となし、鋳型の上部壁および下部壁に温度セ
ンサを設けたことに特徴を有するものである。 From the above-mentioned point of view, this invention aims to reduce the chemical composition of the slab due to the imbalance of heat flux during the cooling and solidification of molten steel in the mold when pulling the slab whose surface layer is solidifying from the mold in horizontal continuous casting. to prevent metallurgical structure segregation and slab deformation,
Produces high-quality slabs without breakouts.
This provides a horizontal continuous mold method that allows for highly efficient manufacturing, and includes providing a cooling water circulation passageway for directly cooling only the mold upper wall in the mold upper wall near the initial solidification generation area of molten steel that has flowed into the mold. The mold is characterized in that the lower wall of the mold is used as a heat reservoir without providing a cooling water circulation passage, and that temperature sensors are provided on the upper and lower walls of the mold.
次に、この発明を実施例により図面と共に説明
する。 Next, the present invention will be explained with reference to examples and drawings.
第６図にはこの発明の水平連続鋳造用鋳型の一
例が鋳型部分の上半部断面図により、第７図には
第６図のＡ−Ａ線断面図により示されている。 An example of the horizontal continuous casting mold of the present invention is shown in FIG. 6 as a cross-sectional view of the upper half of the mold portion, and FIG. 7 is a cross-sectional view taken along the line A--A in FIG. 6.
この発明の鋳型１５には、鋳型１５内に流入し
た溶鋼の初期凝固生成部付近における鋳型上部壁
１５ａに、前記鋳型上部壁１５ａのみを直接冷却
する冷却水循環通路１６が設けられている。１７
は前記冷却水循環通路１６に冷却水を供給する冷
却水供給用マニホルド、１８は冷却水排出用マニ
ホルドである。 In the mold 15 of the present invention, a cooling water circulation passage 16 is provided in the mold upper wall 15a near the initial solidification generation area of the molten steel that has flowed into the mold 15, for directly cooling only the mold upper wall 15a. 17
1 is a cooling water supply manifold that supplies cooling water to the cooling water circulation passage 16, and 18 is a cooling water discharge manifold.
溶鋼の初期凝固生成部付近における鋳型下部壁
１５ｂには、冷却水循環通路を設けず、熱溜め部
となつている。１９は、前記鋳型上部壁１５ａお
よび下部壁１５ｂに設けられた温度センサであ
る。また、溶鋼の初期凝固生成部に続く鋳型１５
の外周には、冷却水チヤネル９が設けられている
こと従来の鋳型と同様である。 The mold lower wall 15b in the vicinity of the initial solidification generation area of molten steel is not provided with a cooling water circulation passage and serves as a heat reservoir. Reference numeral 19 denotes a temperature sensor provided on the upper wall 15a and lower wall 15b of the mold. In addition, the mold 15 following the initial solidification generation part of molten steel
A cooling water channel 9 is provided on the outer periphery of the mold, similar to the conventional mold.
この発明の鋳型は上述のように構成されている
ので、鋳型下部壁１５ｂには鋳型内に流入した溶
鋼から伝達された熱が溜められ、大部分は鋳型上
部壁１５ａに伝わり、一部分は自然放熱で除熱さ
れる。従つて、鋳型１５には温度勾配が生じ、鋳
型下部壁１５ｂは、鋳型上部壁１５ａより温度が
高くなり、前述した鋳型内における熱流束のアン
バランスは解消されて鋳型内における溶鋼が下部
のみ過冷却されることを防止することができる。 Since the mold of the present invention is configured as described above, the heat transferred from the molten steel that has flowed into the mold is stored in the mold lower wall 15b, most of it is transmitted to the mold upper wall 15a, and a part is naturally dissipated. Heat is removed by Therefore, a temperature gradient occurs in the mold 15, and the temperature of the lower mold wall 15b becomes higher than that of the upper mold wall 15a, and the aforementioned unbalance of heat flux within the mold is eliminated, and the molten steel in the mold is concentrated only in the lower part. Cooling can be prevented.
なお、鋳型上部壁１５ａ、鋳型下部壁１５ｂに
設けられた温度センサ１９により、鋳型上部壁１
５ａ内を流れる冷却水の流量は、熱流束のアンバ
ランスが解消される適正量に制御される。このよ
うな冷却水流量の制御手段としては、
(1) 凝固シエルの表面温度を予め推定し、前記表
面温度がシエルの上下部において等しくなるよ
うに冷却水流量を制御する。 Note that temperature sensors 19 provided on the upper mold wall 15a and the lower mold wall 15b detect the temperature of the upper mold wall 1.
The flow rate of the cooling water flowing through the inside of the cooling water 5a is controlled to an appropriate amount that eliminates the imbalance of heat flux. Such cooling water flow rate control means include: (1) The surface temperature of the solidified shell is estimated in advance, and the cooling water flow rate is controlled so that the surface temperature is equal between the upper and lower portions of the shell.
(2) 凝固シエルの厚さを予め推定し、前記厚さが
シエルの上下部において等しくなるように冷却
水流量を制御する。(2) The thickness of the solidified shell is estimated in advance, and the cooling water flow rate is controlled so that the thickness is equal at the top and bottom of the shell.
(3) 鋳型から抽出された鋳片の曲がり量を測定
し、前記曲がり量が零となるように冷却水流量
を制御する、
等の手段により行なうことができる。(3) This can be done by measuring the amount of bending of the slab extracted from the mold and controlling the flow rate of cooling water so that the amount of bending becomes zero.
以上述べたように、この発明によれば、鋳型内
溶鋼の冷却凝固時における熱流束のアンバランス
による鋳片の化学成分や治金的組織の偏析および
鋳片の変形等は適確に防止され、品質の優れた鋳
片をブレークアウトが発生せず、効率高く製造で
きる等、工業上優れた効果がもたらされる。 As described above, according to the present invention, segregation of the chemical components and metallurgical structure of the slab and deformation of the slab due to the imbalance of heat flux during cooling and solidification of molten steel in the mold can be accurately prevented. This brings about excellent industrial effects, such as the ability to efficiently produce high-quality slabs without breakout.
第１図は水平連続鋳造機におけるタンデイツシ
ユに設けられた鋳型部分の断面図、第２図は第１
図のＡ−Ａ線断面図、第３図は鋳型内の温度分布
パターンを示す図、第４図は回転鋳型式水平連続
鋳造機の概略側面図、第５図は第４図Ａ−Ａ線断
面図、第６図はこの発明の水平連続鋳造用鋳型の
上半部断面図、第７図は第６図Ａ−Ａ線断面図で
ある。図面において、
１……タンデイツシユ側壁、２……溶鋼流出
口、３……シーテイングノズル、４……フロント
ノズル、５……フイードノズル、６……ブレーク
リング、７……鋳型、８……冷却用チエンバー、
９……冷却チヤネル、１０……シエル、１１……
鋳片、１２……ドラム状鋳型、１３……凹部、１
４……無端ベルト、１５……この発明の鋳型、１
５ａ……鋳型上部壁、１５ｂ……鋳型下部壁、１
６……冷却水循環通路、１７……冷却水供給用マ
ニホルド、１８……冷却水排出用マニホルド、１
９……温度センサ。
Figure 1 is a sectional view of the mold part installed in the tundish in a horizontal continuous casting machine, and Figure 2 is a cross-sectional view of the mold part installed in the tundish in a horizontal continuous casting machine.
Figure 3 is a diagram showing the temperature distribution pattern in the mold, Figure 4 is a schematic side view of a rotary mold type horizontal continuous casting machine, and Figure 5 is a diagram taken along the line A-A in Figure 4. 6 is a sectional view of the upper half of the horizontal continuous casting mold of the present invention, and FIG. 7 is a sectional view taken along the line A--A in FIG. 6. In the drawings, 1... Tundishu side wall, 2... Molten steel outlet, 3... Seating nozzle, 4... Front nozzle, 5... Feed nozzle, 6... Break ring, 7... Mold, 8... Cooling. chamber,
9...Cooling channel, 10...Ciel, 11...
Slab, 12... Drum-shaped mold, 13... Concavity, 1
4... Endless belt, 15... Mold of this invention, 1
5a... Mold upper wall, 15b... Mold lower wall, 1
6...Cooling water circulation passage, 17...Cooling water supply manifold, 18...Cooling water discharge manifold, 1
9...Temperature sensor.
Claims (1)
けられた水平連続鋳造用鋳型において、 前記鋳型内に流入した溶鋼の初期凝固生成部付
近における鋳型上部壁に、前記鋳型上部壁のみを
直接冷却する冷却水循環通路を設け、鋳型下部壁
は冷却水循環通路を設けずに熱溜め部となし、鋳
型の上部壁および下部壁に温度センサを設けたこ
とを特徴とする水平連続鋳造用鋳型。[Scope of Claims] 1. In a horizontal continuous casting mold provided horizontally at the lower part of the side wall of a tundish, only the upper mold wall is provided on the upper mold wall near the initial solidification generation area of molten steel that has flowed into the mold. A mold for horizontal continuous casting, characterized in that a cooling water circulation passage for directly cooling the mold is provided, the lower wall of the mold is used as a heat reservoir without providing a cooling water circulation passage, and temperature sensors are provided on the upper and lower walls of the mold. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10048780A JPS5725259A (en) | 1980-07-24 | 1980-07-24 | Mold for horizontal continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10048780A JPS5725259A (en) | 1980-07-24 | 1980-07-24 | Mold for horizontal continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5725259A JPS5725259A (en) | 1982-02-10 |
| JPS6144586B2 true JPS6144586B2 (en) | 1986-10-03 |
Family
ID=14275279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10048780A Granted JPS5725259A (en) | 1980-07-24 | 1980-07-24 | Mold for horizontal continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5725259A (en) |
-
1980
- 1980-07-24 JP JP10048780A patent/JPS5725259A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5725259A (en) | 1982-02-10 |
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