JPS6235565Y2 - - Google Patents
Info
- Publication number
- JPS6235565Y2 JPS6235565Y2 JP4890282U JP4890282U JPS6235565Y2 JP S6235565 Y2 JPS6235565 Y2 JP S6235565Y2 JP 4890282 U JP4890282 U JP 4890282U JP 4890282 U JP4890282 U JP 4890282U JP S6235565 Y2 JPS6235565 Y2 JP S6235565Y2
- Authority
- JP
- Japan
- Prior art keywords
- tundish
- inclusions
- weir
- molten metal
- bath
- 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
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 238000009749 continuous casting Methods 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 239000011819 refractory material Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000005266 casting Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Description
この考案は連続鋳造用タンデイツシユに関し、
溶鋼中の非金属介在物を効率的に分離することを
目的とする。
連続鋳造において、溶鋼は取鍋からタンデイツ
シユと呼ばれる中間鍋に移され、ここから鋳型内
に導かれる。この際、取鍋内に懸濁する非金属介
在物もその一部はタンデイツシユ内で浮上するが
大部分は鋳型内に持込まれる。
鋳型内に持込まれた介在物は、鋳型内でも一部
浮上分離するが、凝固シエル内に捕捉されるもの
も多く、これが表面欠陥や内部欠陥の原因となり
高級鋼の連鋳化を阻害したり、連鋳鋳片の加熱炉
への熱片装入を阻害する等の問題を引起こしてい
る。
近年省エネルギ、省資源の観点から高級鋼の連
鋳化や熱片装入は重要なテーマとなつており、そ
のため上記した非金属介在物の除去対策も種々と
られている。
たとえば前工程における溶鋼の清浄化対策や或
はタンデイツシユ内に堰を設置して介在物を除去
する方法等が採用されている。
第１図と第２図に堰を用いたタンデイツシユの
一例を示す。図中、１はタンデイツシユ、２，２
は出湯口、３は取鍋である。タンデイツシユ１内
にはその幅方向に一対の堰４，４が設置され、タ
ンデイツシユ１を受湯浴１ａと出湯浴１ｂ，１ｂ
とに分離している。堰４，４には夫々連通孔５，
５が設けられており、溶湯はこの孔５から出湯浴
１ｂ，１ｂ側に流れる構成となつている。この連
通孔５の形状、数量、配置には種々のものがあ
り、その数例を第３図に示す。このような堰４を
設けて受湯浴１ａと出湯浴１ｂとに分離した構造
によれば、出湯浴１ｂにおいて溶湯は静止し、こ
こで介在物が浮上して分離されやすくなる。
しかし上記構成のタンデイツシユや、また清浄
化対策を用いても、まだ非金属介在物の除去は十
分ではなく依然として鋳型内に持込まれる介在物
が多い。
そこで本願出願人は上記構造のタンデイツシユ
に改良を加えて堰４全面に多数の貫通孔を設け、
この貫通孔を溶湯が通過する際にその内面に介在
物が吸着される効果を利用した考案を実公昭52−
27843号にて提案済である。この提案採の考案に
よれば、介在物の除去能力は更に向上し、所定の
効果は得られるが、堰の面積はタンデイツシユの
大きさにより制限されるため、貫通孔の数を増や
して吸着能力を高めようとしても堰の面積による
限界があるという欠点があつた。そのため貫通孔
の径を小さくして貫通孔の数及びその内壁面積を
増加させることも検討されたが、この場合、多連
鋳時に吸着が進行して貫通孔が閉塞し、鋳造が不
可能になる欠点があつた。
本考案は上記した提案済のタンデイツシユに更
に改良を加えたもので、堰自体に多数の貫通孔を
設けることをやめて堰には従来と同様に比較的径
大の連通孔を形成し、該堰の連通孔の出湯浴側に
多数の貫通孔を形成した耐火物からなる板体を別
途設置したことを特徴とするものである。
以下本考案の一実施例を図面に基づいて説明す
る。
第４図は正断面図、第５図は平面図であり、第
１図と同一のものには同一の番号を付してある。
本考案のタンデイツシユにおいては、貫通孔１
１を多数形成した耐火物からなる多孔板１０，１
０が設置される。該多孔板１０，１０は堰４，４
の連通孔５の近傍出湯浴１ｂ側に設けられてい
る。そして連通孔５からの溶湯の流れを横切る方
向に沿つて設置され、この実施例においては堰４
にほぼ平行に配置している。この多孔板１０の配
置法、数量は種々の態様が可能であつて、溶湯が
多孔板１０面にほぼ垂直に当り、その貫通孔１１
に溶湯が導かれるように配置すればどのようなも
のであつても良い。
第６図に示す実施例では多孔板１０を平行に
夫々２列配置している。このような構成によれば
介在物の吸着率は更に向上する。また第７図及び
第８図に示す実施例においては、堰４にほぼ平行
に配置した多孔板１０の他に、この板面に当つて
該面に沿つて左右に分流する溶湯をも捕捉すべく
多孔板１０の両端にこれとほぼ直角に他の多孔板
１０ａ，１０ａを設置し、全体をコの字状に形成
した構成としている。更に第９図に示す実施例で
は多孔板１０の面に沿つて上昇する溶湯も捕捉す
るために、上側にも他の多孔板１０ｂを設置し、
全体として箱形状を形成した構成としている。こ
れら第７図乃至第９図に示す構成によれば介在物
の除去率が更に向上する。なお、多孔板１０，１
０ａ，１０ｂは別個に配置しても、一体的に形成
しても良い。多孔板１０に設ける貫通孔１１の形
状は第１０図に示すように丸形であつても良い
し、第１１図に示すように角形であつても良い。
また他のどのような形状であつても良い。貫通孔
１１の大きさは溶鋼が通過しなければならないた
め円形孔の場合、少なくとも３mmφ以上が必要で
ある。
次に本考案に係るタンデイツシユを用いて実際
に鋳造を行つた場合の介在物の除去効果を示す。
容量40tonのタンデイツシユを本考案の構成を
適用し、下掲表に示す組成の低炭素アルミキルド
鋼を10.5mRの湾曲型スラブ連鋳機に鋳込み、鋳
造後、鋳片内の介在物量を調査した。スラブの大
きさは250mm×1490mmであり、鋳造スピードは1.2
ｍ／minとした。また堰４の連通孔５は第２図ａ
に示す形状のものとし、多孔板１０は第４図及び
第５図に示す１枚ずつ設置した構成と、第６図に
示す２枚ずつ設置した構成の両方について試験を
行つた。多孔板１０の貫通孔１１の形状は丸形と
し、その径を10mmφとした。
介在物量の検出結果を多孔板１０を用いない従
来装置の場合と対比して第１２図に示す。
このグラフより本発明装置の場合、介在物量は
約1/2又はそれ以下に減少していることがわか
る。これは多孔板１０の貫通孔１１の内壁に介在
物が吸着されたためであり、鋳造終了後タンデイ
ツシユを調査した結果、貫通孔１１の内壁に白色
のAl2O3粉末の付着がみられた。
This invention relates to a tandate for continuous casting.
The purpose is to efficiently separate nonmetallic inclusions in molten steel. In continuous casting, molten steel is transferred from a ladle to an intermediate pot called a tundish, from where it is guided into a mold. At this time, some of the nonmetallic inclusions suspended in the ladle float up in the tundish, but most of them are brought into the mold. Some of the inclusions brought into the mold float and separate within the mold, but many of them are trapped in the solidified shell, which causes surface defects and internal defects, which may impede continuous casting of high-grade steel. This causes problems such as hindering the charging of continuously cast slabs into the heating furnace. In recent years, continuous casting of high-grade steel and hot slab charging have become important themes from the viewpoint of energy saving and resource saving, and therefore various measures have been taken to remove the above-mentioned nonmetallic inclusions. For example, measures have been taken to clean the molten steel in the previous process, or to remove inclusions by installing a weir inside the tundish. Figures 1 and 2 show an example of a tundish using a weir. In the diagram, 1 is tandaishi, 2, 2
3 is the tap, and 3 is the ladle. A pair of weirs 4, 4 are installed in the tundish 1 in its width direction, and the tundish 1 is connected to a receiving bath 1a and a hot water outlet bath 1b, 1b.
It is separated into Weirs 4 and 4 have communication holes 5 and 4, respectively.
5 is provided, and the molten metal is configured to flow from this hole 5 to the tapping baths 1b, 1b side. There are various shapes, numbers, and arrangements of the communicating holes 5, some examples of which are shown in FIG. According to the structure in which such a weir 4 is provided and the bath is separated into the receiving bath 1a and the tapping bath 1b, the molten metal stands still in the tapping bath 1b, and inclusions float there and are easily separated. However, even with the tundish having the above structure and cleaning measures, the removal of non-metallic inclusions is still insufficient and many inclusions are still carried into the mold. Therefore, the applicant has improved the tundish structure of the above structure by providing a large number of through holes on the entire surface of the weir 4,
In 1973, a device was developed that took advantage of the effect that inclusions were adsorbed on the inner surface of the molten metal when it passed through the through hole.
It has already been proposed in No. 27843. According to this proposed method, the ability to remove inclusions is further improved and the desired effect can be obtained, but since the area of the weir is limited by the size of the tundish, the number of through holes must be increased to increase the adsorption capacity. Even if an attempt was made to increase this, there was a drawback that there was a limit due to the area of the weir. Therefore, it was considered to increase the number of through holes and their inner wall area by reducing the diameter of the through holes, but in this case, adsorption progresses during multiple casting and the through holes become blocked, making casting impossible. There was a drawback. The present invention is a further improvement of the tundish proposed above, and instead of providing a large number of through holes in the weir itself, a relatively large diameter communicating hole is formed in the weir as in the past. It is characterized by separately installing a plate made of refractory material with a large number of through holes formed on the hot water bath side of the communicating hole. An embodiment of the present invention will be described below based on the drawings. 4 is a front sectional view, and FIG. 5 is a plan view, and the same parts as in FIG. 1 are given the same numbers. In the tundish of the present invention, the through hole 1
A perforated plate 10, 1 made of a refractory material in which a large number of 1 are formed.
0 is set. The porous plates 10, 10 are the weirs 4, 4
It is provided near the communication hole 5 on the hot water bath 1b side. The weir 4 is installed along the direction that crosses the flow of molten metal from the communication hole 5.
It is placed almost parallel to. The arrangement method and quantity of the perforated plate 10 can be varied in various ways.
Any type of arrangement may be used as long as it is arranged so that the molten metal is guided. In the embodiment shown in FIG. 6, two rows of perforated plates 10 are arranged in parallel. According to such a configuration, the adsorption rate of inclusions is further improved. In addition, in the embodiment shown in FIGS. 7 and 8, in addition to the perforated plate 10 arranged almost parallel to the weir 4, the molten metal that hits this plate surface and flows left and right along the surface is also captured. Other perforated plates 10a, 10a are installed at both ends of the perforated plate 10 at substantially right angles to the perforated plate 10, and the entire plate is formed into a U-shape. Furthermore, in the embodiment shown in FIG. 9, another perforated plate 10b is installed above the perforated plate 10 in order to capture the molten metal rising along the surface of the perforated plate 10.
The structure has a box shape as a whole. According to the configurations shown in FIGS. 7 to 9, the removal rate of inclusions is further improved. In addition, the perforated plate 10,1
0a and 10b may be arranged separately or may be formed integrally. The shape of the through holes 11 provided in the porous plate 10 may be round as shown in FIG. 10, or square as shown in FIG. 11.
Moreover, it may have any other shape. The size of the through hole 11 must be at least 3 mmφ in the case of a circular hole because the molten steel must pass therethrough. Next, the effect of removing inclusions when actual casting is performed using the tundish according to the present invention will be described. Applying the configuration of the present invention to a 40 ton capacity tundish, low carbon aluminum killed steel with the composition shown in the table below was cast into a 10.5 mR curved continuous slab caster, and after casting, the amount of inclusions in the slab was investigated. The size of the slab is 250mm x 1490mm, and the casting speed is 1.2
m/min. Also, the communication hole 5 of the weir 4 is shown in Figure 2a.
The perforated plates 10 had the shape shown in Figures 4 and 5, and the perforated plates 10 were tested in both a configuration in which one perforated plate was installed as shown in Figs. 4 and 5, and in a configuration in which two perforated plates were installed as shown in Fig. 6. The through holes 11 of the perforated plate 10 were round in shape and had a diameter of 10 mmφ. The detection results of the amount of inclusions are shown in FIG. 12 in comparison with the case of a conventional device that does not use the perforated plate 10. This graph shows that in the case of the apparatus of the present invention, the amount of inclusions is reduced to about 1/2 or less. This is because inclusions were adsorbed on the inner walls of the through holes 11 of the perforated plate 10, and when the tundish was examined after casting, white Al 2 O 3 powder was found to be attached to the inner walls of the through holes 11.
【表】
なお上記では、第１図、第２図に示す構造のタ
ンデイツシユに本考案を適用した実施例について
説明したが、本考案は貫通孔を有する堰により受
湯浴と出湯浴とに分離した構造のタンデイツシユ
であれば、どのようなものにも適用可能である。
たとえばＴ型タンデイツシユに本考案を適用した
実施例を第１３図に示す。[Table] In the above, an example in which the present invention is applied to a tundish with the structure shown in Figs. 1 and 2 has been described. The present invention can be applied to any tundish as long as it has a similar structure.
For example, FIG. 13 shows an embodiment in which the present invention is applied to a T-type tundish.
第１図は従来のタンデイツシユの構造を示す正
断面図、第２図はその平面図、第３図は堰の貫通
孔の形状、配置の説明図、第４図は本考案の一実
施例を示す正断面図、第５図はその平面図、第６
図は他の実施例を示す正断面図、第７図は更に他
の実施例を示す平面図、第８図は第７図における
板の斜視図、第９図は更に他の実施例における板
の斜視図、第１０図は板の貫通孔の一実施例を示
す斜視図、第１１図は他の実施例を示す斜視図、
第１２図は本考案の効果を示すグラフ、第１３図
は本考案をＴ型タンデイツシユに適用した場合の
一実施例を示す平面図である。
図中、１はタンデイツシユ、１ａは受湯浴、１
ｂは出湯浴、２は出湯口、３は取鍋、４は堰、５
は連通孔、１０，１０ａ，１０ｂは多孔板、１１
は貫通孔を各示す。
Fig. 1 is a front cross-sectional view showing the structure of a conventional tundish, Fig. 2 is a plan view thereof, Fig. 3 is an explanatory diagram of the shape and arrangement of the weir through-hole, and Fig. 4 is an embodiment of the present invention. Fig. 5 is a plan view, Fig. 6 is a front sectional view.
The figure is a front sectional view showing another embodiment, FIG. 7 is a plan view showing still another embodiment, FIG. 8 is a perspective view of the plate in FIG. 7, and FIG. 9 is a plate in still another embodiment. , FIG. 10 is a perspective view showing one embodiment of the through hole in the plate, FIG. 11 is a perspective view showing another embodiment,
FIG. 12 is a graph showing the effects of the present invention, and FIG. 13 is a plan view showing an embodiment in which the present invention is applied to a T-type tundish. In the figure, 1 is a tundish, 1a is a hot water bath, 1
b is a hot water bath, 2 is a hot water outlet, 3 is a ladle, 4 is a weir, 5
are communicating holes, 10, 10a, 10b are perforated plates, 11
indicates each through hole.
Claims (1)
溶湯を出湯する出湯浴とに分離された連続鋳造用
タンデイツシユにおいて、該連通孔の出湯浴側近
傍に該連通孔からの溶湯がその板面にほぼ垂直に
当るように多数の貫通孔を有する耐火物からなる
多孔板を１又は２以上設置したことを特徴とする
連続鋳造用タンデイツシユ。 In a continuous casting tundish which is separated by a weir having a communicating hole into a receiving bath for receiving molten metal and a tapping bath for discharging the molten metal, the molten metal from the communicating hole is placed on the plate surface near the tapping bath side of the communicating hole. 1. A tundish for continuous casting, characterized in that one or more perforated plates made of refractory material and having a large number of through holes arranged substantially perpendicularly are installed therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4890282U JPS58152351U (en) | 1982-04-06 | 1982-04-06 | Tandate for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4890282U JPS58152351U (en) | 1982-04-06 | 1982-04-06 | Tandate for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58152351U JPS58152351U (en) | 1983-10-12 |
| JPS6235565Y2 true JPS6235565Y2 (en) | 1987-09-10 |
Family
ID=30059800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4890282U Granted JPS58152351U (en) | 1982-04-06 | 1982-04-06 | Tandate for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58152351U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100778743B1 (en) * | 2001-12-24 | 2007-11-23 | 주식회사 포스코 | Device for blocking slag of tundish in continuous casting plant |
-
1982
- 1982-04-06 JP JP4890282U patent/JPS58152351U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58152351U (en) | 1983-10-12 |
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