JPH04238656A - Method for reusing tundish for continuous casting - Google Patents
Method for reusing tundish for continuous castingInfo
- Publication number
- JPH04238656A JPH04238656A JP1275291A JP1275291A JPH04238656A JP H04238656 A JPH04238656 A JP H04238656A JP 1275291 A JP1275291 A JP 1275291A JP 1275291 A JP1275291 A JP 1275291A JP H04238656 A JPH04238656 A JP H04238656A
- Authority
- JP
- Japan
- Prior art keywords
- tundish
- steel
- air
- combustion
- remained
- 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- Withdrawn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
- 238000009749 continuous casting Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000001301 oxygen Substances 0.000 claims abstract description 39
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 39
- 238000002485 combustion reaction Methods 0.000 claims abstract description 27
- 239000002893 slag Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000000446 fuel Substances 0.000 claims description 7
- 239000002737 fuel gas Substances 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 9
- 238000002844 melting Methods 0.000 abstract description 5
- 230000008018 melting Effects 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 11
- 239000000567 combustion gas Substances 0.000 description 7
- 239000002436 steel type Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 ferrous metals Chemical class 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- QRSFFHRCBYCWBS-UHFFFAOYSA-N [O].[O] Chemical compound [O].[O] QRSFFHRCBYCWBS-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、連続鋳造を終了した後
にタンディッシュを熱間のまま再使用する方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reusing a tundish while still hot after continuous casting.
【０００２】0002
【従来の技術】従来、連続鋳造において連々鋳する場合
、一度使用したタンディッシュ内には鋼および鋼滓が残
存しているので、鋼種変更の際には一旦タンディッシュ
をその整備場へ運搬し、そこで残存する鋼・鋼滓を冷却
・固化させてからクレーン等にて衝撃力を加えて物理的
に除去し、内張り耐火物の整備を行った後、バーナーに
て乾燥・予熱し、再び鋳造位置へ運んで再使用する方法
がとられていた。[Prior Art] Conventionally, when continuous casting is performed, steel and steel slag remain in the tundish once used, so when changing the steel type, the tundish must be transported to the maintenance site. After the remaining steel and steel slag is cooled and solidified, it is physically removed by applying impact force using a crane, etc. After the lining refractory is prepared, it is dried and preheated with a burner, and cast again. The method used was to transport it to a new location and reuse it.
【０００３】しかし、この方法では■耐火物寿命は８〜
１０チャージ程度あるが、同一鋼種連続数の制約から鋼
種変更の場合には前記寿命以下の２〜６チャージ位でタ
ンディッシュ整備にまわることが多く、タンディッシュ
耐火物コストが高くついていた。■一旦常温近くまで冷
却してから残存する鋼・鋼滓の処理を行い耐火物の整備
をするので、タンディッシュ再使用前に行う予熱のため
に多くのエネルギーを要する。■残存する鋼・鋼滓の処
理は暑熱重筋作業であるばかりでなく、作業量が多い。
等の種々問題点を有していた。最近、鋼種構成がますま
す少量多品種化してきて、これら問題点が顕在化してき
たことから、これを解決する方法として、タンディッシ
ュを熱間のままで耐火物寿命がくるまで鋼種が変わって
も再使用する方法が種々提案・実施されてきている。[0003] However, with this method, the lifespan of refractories is 8~
There are about 10 charges, but due to the restriction on the number of consecutive steel types, when changing the steel type, tundish maintenance is often required at about 2 to 6 charges below the above-mentioned life, resulting in high tundish refractory costs. ■Since the tundish is cooled to near room temperature and then the remaining steel and steel slag are processed and the refractories are maintained, a lot of energy is required to preheat the tundish before reusing it. ■Disposal of remaining steel and steel slag is not only hot, heavy-duty work, but also requires a large amount of work. It had various problems such as. Recently, the composition of steel types has become more diverse in small quantities, and these problems have become more apparent.As a way to solve this problem, the steel type can be changed by leaving the tundish hot until the end of the refractory life. Various methods for reusing materials have been proposed and implemented.
【０００４】例えば、特開昭６２−１２７１４６号公報
ではタンディッシュ内に残存する鋼・鋼滓をバーナーに
より溶解・除去し、そのまま利用する方法が提案されて
おり、さらにこれを改善した方法として特開平２−１５
１３５２号公報では、残存する鋼・鋼滓の溶解・除去用
に酸素富化バーナーを用いる方法が提案されている。For example, Japanese Patent Application Laid-Open No. 127146/1983 proposes a method in which steel and steel slag remaining in the tundish are melted and removed using a burner and used as is. Kaihei 2-15
No. 1352 proposes a method using an oxygen-enriched burner to melt and remove remaining steel and steel slag.
【０００５】[0005]
【発明が解決しようとする課題】これらのバーナー （
酸素富化バーナーを含めて） を用いてタンディッシュ
内に残存する鋼・鋼滓を溶解、除去して、熱間のままタ
ンディッシュを再使用する方法の問題点は、燃焼後のガ
ス中の酸素濃度が高くタンディッシュ内は酸化雰囲気と
なるため、残存物が完全除去できないとき残存する鋼・
鋼滓が酸化され、鉄や非鉄金属の酸化物となってタンデ
ィッシュ内に残り、バーナー消火後、次チャージの溶鋼
を注入した場合に、溶鋼内にこれらの酸化物が混入し、
鋳造後のスラブ・成品の疵の原因になり易いことである
。本発明は、前述の問題点を解消し、連続鋳造における
タンディッシュを熱間のままで再使用するため残存する
鋼・鋼滓をバーナーにて溶解・除去する場合に、除去し
きらない小量残存物による上述のような問題を解消する
方法を提供することを目的としている。[Problem to be solved by the invention] These burners (
The problem with the method of melting and removing the steel and steel slag remaining in the tundish using an oxygen-enriched burner (including an oxygen-enriched burner) and reusing the tundish while still hot is that The high oxygen concentration creates an oxidizing atmosphere inside the tundish, so if the residue cannot be completely removed, the remaining steel
Steel slag is oxidized and becomes oxides of iron and non-ferrous metals that remain in the tundish, and when the next charge of molten steel is injected after the burner is extinguished, these oxides get mixed into the molten steel.
This is likely to cause defects in the slab and finished product after casting. The present invention solves the above-mentioned problems, and when the remaining steel and steel slag are melted and removed with a burner in order to reuse the tundish in continuous casting while still hot, the small amount that cannot be completely removed is solved. It is an object of the present invention to provide a method for solving the above-mentioned problems caused by residual materials.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
、本発明者らは鋭意検討を重ねた結果、連続鋳造タンデ
ィッシュの熱間連続使用にはタンディッシュ内残留物の
溶解除去に際し、酸素富化空気を使用した空気比１未満
の燃焼焔を用いる場合には、次の連続鋳造で鋳込まれる
製品に疵等の欠陥を生ずることがないことを知見し本発
明を完成するに至った。[Means for Solving the Problems] In order to achieve the above object, the inventors of the present invention have conducted intensive studies, and have found that, for continuous hot use of a continuous casting tundish, oxygen is required when dissolving and removing residue in the tundish. The inventors discovered that when using a combustion flame with an air ratio of less than 1 using enriched air, defects such as scratches do not occur in the product to be cast in the next continuous casting process, which led to the completion of the present invention. .
【０００７】すなわち、本発明は、連続鋳造後のタンデ
ィッシュ内に残存する鋼および鋼滓を熱間で溶解除去す
ることにより該タンディッシュを再使用する方法であっ
て、残留物の溶解除去のため燃料の燃焼に使用する空気
が酸素富化されたものであると共に、空気比（燃焼に使
用される実際の空気量／理論空気量）が１未満の状態で
燃焼させることを特徴とする。また、本発明においては
燃焼温度を高めるため、酸素富化空気の使用と共に、燃
焼効率向上のため、燃料と空気の均一混合が可能な旋回
羽根等を有する構造のバーナーを採用することが望まし
い。That is, the present invention is a method for reusing a tundish by hot dissolving and removing the steel and steel slag remaining in the tundish after continuous casting, and the method includes: Therefore, the air used for combustion of the fuel is enriched with oxygen, and the combustion is performed in a state where the air ratio (actual amount of air used for combustion/theoretical amount of air) is less than 1. Further, in the present invention, in order to increase the combustion temperature, it is desirable to use oxygen-enriched air, and to improve combustion efficiency, it is desirable to employ a burner having a structure such as a swirl vane that can uniformly mix fuel and air.
【０００８】[0008]
【作用】通常、バーナーは完全燃焼させるために理論空
気量より少し多い空気（ 空気比で１．１ 〜１．２
位） で燃料ガスを燃焼させる。このために過剰の空気
分だけ燃焼後の燃焼ガス中に酸素が残ることとなるが、
本発明によれば、空気比を１未満とすることにより、燃
焼後の燃焼ガス中の酸素濃度を下げることができる。た
だし、この場合、通常のバーナー形状のままでは燃焼効
率が下がり、不完全燃焼ガスが増してくるので、できる
だけ効率よく燃焼するようにバーナー形状を工夫する必
要がある。理論的には酸素不足の分はどうしても不完全
燃焼にはなるのであるが、その範囲内で可及的高い燃焼
効率を得ることが望まれる。燃焼効率が下がると燃焼ガ
ス温度も低下するので、それを補うためには、燃焼用空
気中に酸素を富化し、酸素濃度を高め燃焼用空気の絶対
量を少なくする必要がある。[Operation] Normally, the burner uses a little more air than the theoretical air amount (air ratio: 1.1 to 1.2) to achieve complete combustion.
) to burn the fuel gas. For this reason, oxygen remains in the combustion gas after combustion by the amount of excess air.
According to the present invention, by setting the air ratio to less than 1, the oxygen concentration in the combustion gas after combustion can be lowered. However, in this case, if the burner is kept in its normal shape, the combustion efficiency will decrease and the amount of incompletely combusted gas will increase, so it is necessary to devise a shape for the burner so that it burns as efficiently as possible. Theoretically, the lack of oxygen will inevitably result in incomplete combustion, but it is desirable to obtain as high a combustion efficiency as possible within this range. When the combustion efficiency decreases, the combustion gas temperature also decreases, so in order to compensate for this, it is necessary to enrich the combustion air with oxygen, increase the oxygen concentration, and reduce the absolute amount of combustion air.
【０００９】ところで、薄鋼板の連続焼鈍設備、連続亜
鉛メッキ設備等においては、連続的に移動する鋼帯を全
く酸化させずに加熱する必要があるので、空気比 （燃
焼に使用される実際の空気量／理論空気量の比） を０
．７ 〜０．９８とした燃料と空気の混合物をバーナー
で燃焼し、かつ還元雰囲気となる火炎部分を鋼帯に直接
当てて加熱している。しかし、本発明方法における連続
鋳造用タンディッシュ内に残存する鋼・鋼滓を溶解・除
去するためには、加熱雰囲気を還元雰囲気にまでする必
要はないので、例えば空気比０．９８以下でバーナーを
使って燃焼させ、酸素濃度を下げた（ 酸素濃度０．１
容積％以下） 燃焼ガスを使用してもよい。火炎を直
接処理物に当てる必要はない。By the way, in continuous annealing equipment for thin steel sheets, continuous galvanizing equipment, etc., it is necessary to heat the continuously moving steel strip without oxidizing it at all. Ratio of air volume/theoretical air volume) to 0
．． A mixture of fuel and air with a concentration of 7 to 0.98 is combusted in a burner, and the flame part, which creates a reducing atmosphere, is directly applied to the steel strip to heat it. However, in order to melt and remove the steel and steel slag remaining in the continuous casting tundish in the method of the present invention, it is not necessary to make the heating atmosphere a reducing atmosphere. was used to burn it and lower the oxygen concentration (oxygen concentration 0.1
% by volume or less) Combustion gas may be used. There is no need to directly apply the flame to the object to be treated.
【００１０】空気比を下げて燃焼効率が下がることの改
善策として、使用するバーナーは、燃料ガスと空気 （
酸素） をできるだけ均一混合できるように旋回羽根等
を有する燃焼効率のすぐれた構造のものとするのが望ま
しい。また、空気比低下、燃焼効率低下による燃焼ガス
温度の低下に関しては、酸素富化し、好ましくは３０〜
７０容積％程度の酸素含有率の空気を使用して、燃焼後
のガス温度を上げることができ、これにより従来よりも
高温を得ることができ、従来問題であった高融点の残存
物の溶解・除去も可能となる。[0010] As a measure to improve the reduction in combustion efficiency caused by lowering the air ratio, the burner used is a combination of fuel gas and air (
It is desirable to have a structure with excellent combustion efficiency, including swirl vanes, etc., so that the oxygen (oxygen) can be mixed as uniformly as possible. In addition, regarding the decrease in combustion gas temperature due to a decrease in air ratio and combustion efficiency, oxygen enrichment, preferably 30 to 30%
By using air with an oxygen content of about 70% by volume, the gas temperature after combustion can be raised, which allows a higher temperature than before to be obtained, which eliminates the dissolution of high melting point residues, which has been a problem in the past.・It is also possible to remove it.
【００１１】本発明方法にかかる再使用のための熱間に
おけるタンディッシュの加熱操作について図１を参照し
て説明する。例えば、同一鋼種の連続鋳造が完了後、別
鋼種のために再使用しようとするタンディッシュ７の上
部より２個のバーナー１、１でその内部を加熱する。バ
ーナー１、１から出た火炎５はタンディッシュ下部に残
存する鋼や鋼滓１３を溶解し、溶解した鋼・鋼滓はノズ
ル８より排出される。また、鋼、鉱滓溶解後の燃焼ガス
は、溶鋼注入口１２やノズル８より排ガスとなって放散
される。The heating operation of a tundish for reuse according to the method of the present invention will be explained with reference to FIG. For example, after continuous casting of the same steel type is completed, the inside of the tundish 7, which is to be reused for a different steel type, is heated from above by two burners 1, 1. The flame 5 emitted from the burners 1 and 1 melts the steel and steel slag 13 remaining in the lower part of the tundish, and the melted steel and steel slag are discharged from the nozzle 8. Further, the combustion gas after melting the steel and slag becomes exhaust gas and is dissipated from the molten steel inlet 12 and the nozzle 8.
【００１２】バーナー１は燃料ガス２および空気３と酸
素４を予混合した酸素富化空気を強制的に均一混合させ
るための旋回羽根等を有する燃料効率の優れたものを使
用するのが好ましい。バーナー１には燃料ガス２ （コ
ークス炉ガス等） 、空気３、酸素４が供給されるが、
この時の酸素含有率 （空気中の酸素濃度） や空気比
を変化させるために各ガスは、流量を計測し、制御され
る。[0012] It is preferable to use a burner 1 having excellent fuel efficiency and having a swirl vane or the like for forcibly and uniformly mixing oxygen-enriched air, which is a premix of fuel gas 2, air 3, and oxygen 4. Burner 1 is supplied with fuel gas 2 (coke oven gas, etc.), air 3, and oxygen 4.
At this time, the flow rate of each gas is measured and controlled in order to change the oxygen content (oxygen concentration in the air) and air ratio.
【００１３】図２には、図１の装置を使用してバーナー
１を燃焼させたときのタンディッシュ７の加熱温度、つ
まり内張り耐火物の表面温度を示すが、従来法の空気の
み （酸素含有率２１容積％） の場合ではその温度は
１１００〜１２００℃であるが、酸素濃度を５０容積％
まで富化すると１５００℃近くまで加熱でき、タンディ
ッシュ内の残存物を容易に溶解できることが分かる。FIG. 2 shows the heating temperature of the tundish 7, that is, the surface temperature of the lining refractory when the burner 1 is burned using the apparatus shown in FIG. When the oxygen concentration is 21% by volume), the temperature is 1100-1200℃, but the oxygen concentration is 50% by volume.
It can be seen that when enriched to 1,500°C, it can be heated to nearly 1500°C, and the residue in the tundish can be easily dissolved.
【００１４】同じく図１の装置を使用して燃料ガス量を
一定にして、燃焼に使用される空気量 （空気量＋酸素
量） を抑制して空気比を変化させたときのタンディッ
シュ内の雰囲気中の酸素濃度変化を図３に示す。従来の
空気比１．１ 程度ではタンディッシュ内の酸素濃度は
０．５ 容積％であるが、空気比を０．９ まで下げる
と０．０５容積％と不活性ガスで置換した場合と同程度
まで酸素濃度を下げることができる。したがって、特に
小量残存物の酸化を効果的に防止できることが分かる。
最適な燃焼用空気の酸素含有率や空気比は、使用するタ
ンディッシュの大きさや鋼・鋼滓の残存量、作業時間、
バーナー構造等によって異なるが下記の範囲が望ましい
。Similarly, using the apparatus shown in FIG. 1, the amount of fuel gas is kept constant, the amount of air used for combustion (air amount + oxygen amount) is suppressed, and the air ratio is varied. Figure 3 shows the change in oxygen concentration in the atmosphere. At the conventional air ratio of about 1.1, the oxygen concentration in the tundish is 0.5% by volume, but when the air ratio is lowered to 0.9, it becomes 0.05% by volume, which is about the same as when replacing with inert gas. Oxygen concentration can be lowered to Therefore, it can be seen that oxidation of particularly small amounts of residual material can be effectively prevented. The optimal combustion air oxygen content and air ratio depend on the size of the tundish used, the remaining amount of steel and steel slag, the working time,
Although it varies depending on the burner structure etc., the following range is desirable.
【００１５】酸素含有率は３０〜７０容積％が好ましい
。３０％未満では従来 （酸素含有率２１容積％） の
加熱とあまり変わらず、その効果は小さい。７０容積％
を超える含有量になるとバーナー自体が非常な高温にさ
らされるため、その寿命が短くなり、配管内へ逆火する
可能性も大きくなるため好ましくない。空気比は０．７
〜０．９８が良く、１．０ を超えてはならない。０
．７ 未満では燃焼効率が非常に悪くなり加熱温度が十
分に上げられず、また安全上問題となるＣＯガスが大量
に放散される可能性があるため好ましくない。一方０．
９８を超える場合は、燃焼ガス中の酸素量が高くなって
、処理物中に酸化物が生成し、次の鋳造操業での欠陥発
生の原因となる恐れが生ずる。[0015] The oxygen content is preferably 30 to 70% by volume. If it is less than 30%, it is not much different from conventional heating (oxygen content 21% by volume), and its effect is small. 70 volume%
If the content exceeds 100%, the burner itself will be exposed to extremely high temperatures, which will shorten its lifespan and increase the possibility of flashback into the pipes, which is undesirable. Air ratio is 0.7
~0.98 is good and should not exceed 1.0. 0
．． If it is less than 7, the combustion efficiency becomes very poor, the heating temperature cannot be raised sufficiently, and a large amount of CO gas, which poses a safety problem, may be emitted, which is not preferable. On the other hand, 0.
When it exceeds 98, the amount of oxygen in the combustion gas becomes high, and oxides are generated in the processed material, which may cause defects in the next casting operation.
【００１６】[0016]
【実施例】本発明方法の具体的実施例として鋼の連続鋳
造におけるタンディッシュ再使用のための加熱方法につ
いて説明する。本例では図１の装置を使用して本発明方
法を実施した。使用したタンディッシュ７は、耐火物
（厚み２２０ｍｍ）を内張りした容量２２ｔｏｎ（容積
４．２ｍ３）のものであった。バーナーは外径２５０
ｍｍの内部に旋回羽根を有するルーフ型バーナーを２箇
使用した。燃料ガス２にはコークス炉ガス （Ｃガス）
を用いた。EXAMPLE As a specific example of the method of the present invention, a heating method for reusing a tundish in continuous steel casting will be described. In this example, the method of the present invention was carried out using the apparatus shown in FIG. The tundish 7 used is made of refractory material.
It had a capacity of 22 tons (volume: 4.2 m3) and was lined with (thickness: 220 mm). The burner has an outer diameter of 250
Two roof-type burners with swirl vanes inside the mm were used. Fuel gas 2 is coke oven gas (C gas)
was used.
【００１７】連続鋳造終了直後のタンディッシュ７に二
つのバーナー１、１をセットし、点火後、各ガスを所定
量に設定した。ガス流量は１６０ Ｎｍ３／Ｈｒ、酸素
含有率５０％の燃焼用空気 ２８０Ｎｍ３／Ｈｒ （す
なわちＯ２量で１４０Ｎｍ３／Ｈｒ）を流した。理論空
気量は酸素富化率５０％の場合 ３１８Ｎｍ３／Ｈｒ
（Ｏ２量で１５９ Ｎｍ３／Ｈｒ） であり空気比は０
．８８であった。点火２〜３分後からノズル８より溶解
した鋼・鋼滓が滴下し始め、残存物の量にもよるが１５
〜３０分の間にほとんどの残存物を溶解、除去すること
ができた。Two burners 1, 1 were set in the tundish 7 immediately after the completion of continuous casting, and after igniting, each gas was set at a predetermined amount. The gas flow rate was 160 Nm3/Hr, and 280 Nm3/Hr of combustion air with an oxygen content of 50% (ie, 140 Nm3/Hr in O2 amount) was flowed. Theoretical air amount is 318Nm3/Hr when oxygen enrichment rate is 50%
(O2 amount is 159 Nm3/Hr) and the air ratio is 0.
．． It was 88. 2 to 3 minutes after ignition, molten steel and steel slag begin to drip from nozzle 8, and depending on the amount of residual material, 15
Most of the residue could be dissolved and removed within ~30 minutes.
【００１８】タンディッシュ内張り耐火物には凹凸があ
ることなどから、残存物を完全除去することはやはり難
しく、鋼滓はほとんど残存していないが、鋼については
若干（数１０ｋｇ〜数１００ ｋｇ） 残存することが
多かった。この小量残存物である鋼の成分を調査したと
ころ９９．５重量％は酸化していない金属成分であり、
０．５ ％が酸化物（ＦｅＯ、Ｆｅ２０３）等であって
、残存して次の連続鋳造の溶鋼に混入しても問題ない程
度の量であることが判明した。なお、このときのタンデ
ィッシュ内雰囲気の酸素濃度は０．０６容積％であった
。[0018] Due to the unevenness of the tundish lining refractory, it is difficult to completely remove the remaining material, and although almost no steel slag remains, there is some steel slag (several 10 kg to several 100 kg). It often remained. When we investigated the composition of this small amount of steel, it was found that 99.5% by weight was a non-oxidized metal component.
It was found that 0.5% was oxides (FeO, Fe203), etc., and the amount was such that there would be no problem even if it remained and mixed into the molten steel for the next continuous casting. Note that the oxygen concentration in the atmosphere within the tundish at this time was 0.06% by volume.
【００１９】[0019]
【発明の効果】本発明は、以上説明したように構成され
ているから、連続鋳造用タンディッシュ使用後に残存す
る鋼・鋼滓を速やかに除去するとともに小量残存物を酸
化させることがない。従って、そのままタンディッシュ
を再使用しても、次チャージにおいて、残存酸化物に起
因するスラブあるいは成品疵が発生せず、良好な品質の
製品を得ることができ、産業上極めて有用である。Effects of the Invention Since the present invention is constructed as described above, the steel and steel slag remaining after the use of a tundish for continuous casting can be promptly removed and a small amount of residual material will not be oxidized. Therefore, even if the tundish is reused as it is, no slab or product defects due to residual oxides will occur in the next charge, and a product of good quality can be obtained, which is extremely useful industrially.
【図１】本発明方法によるタンディッシュ加熱の説明図
である。FIG. 1 is an explanatory diagram of tundish heating according to the method of the present invention.
【図２】燃焼用空気中の酸素量と加熱温度との関係を示
すグラフである。FIG. 2 is a graph showing the relationship between the amount of oxygen in combustion air and heating temperature.
【図３】空気比とタンディッシュ内酸素濃度の関係を示
すグラフである。FIG. 3 is a graph showing the relationship between air ratio and oxygen concentration in the tundish.
１ バーナー ２ 燃料ガス ３ 空気 ４ 酸素 ５ 火炎 ７ タンディッシュ ８ ノズル １０ 排ガス １２ 注入口 １３ 残存する鋼・鋼滓 1 Burner 2 Fuel gas 3 Air 4 Oxygen 5 Flame 7 Tundish 8 Nozzle 10 Exhaust gas 12 Inlet 13 Remaining steel and steel slag
Claims (2)
するため、該タンディッシュ内に残存する鋼および鋼滓
を加熱して溶解、除去する際に、加熱用の燃料の燃焼に
使用する、酸素を富化した空気の量が、前記燃料を完全
燃焼させるに必要な理論空気量よりも少ない状態で燃料
を燃焼させることを特徴とする連続鋳造用タンディッシ
ュの再使用方法。Claim 1: In order to reuse the tundish after continuous casting, when the steel and steel slag remaining in the tundish are heated, melted, and removed, oxygen is used to burn the heating fuel. A method for reusing a tundish for continuous casting, characterized in that fuel is combusted in a state in which the amount of air enriched with is smaller than the theoretical amount of air required to completely burn the fuel.
う請求項１記載の連続鋳造用タンディッシュの再使用方
法。2. The method for reusing a tundish for continuous casting according to claim 1, wherein combustion is carried out in a burner having swirling vanes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1275291A JPH04238656A (en) | 1991-01-09 | 1991-01-09 | Method for reusing tundish for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1275291A JPH04238656A (en) | 1991-01-09 | 1991-01-09 | Method for reusing tundish for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04238656A true JPH04238656A (en) | 1992-08-26 |
Family
ID=11814146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1275291A Withdrawn JPH04238656A (en) | 1991-01-09 | 1991-01-09 | Method for reusing tundish for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04238656A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06142858A (en) * | 1992-11-04 | 1994-05-24 | Nippon Steel Corp | Method for continuously using tundish |
| KR20220088928A (en) | 2019-11-29 | 2022-06-28 | 제이에프이 스틸 가부시키가이샤 | Molten steel casting method, continuous casting slab manufacturing method and bearing steel manufacturing method |
-
1991
- 1991-01-09 JP JP1275291A patent/JPH04238656A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06142858A (en) * | 1992-11-04 | 1994-05-24 | Nippon Steel Corp | Method for continuously using tundish |
| KR20220088928A (en) | 2019-11-29 | 2022-06-28 | 제이에프이 스틸 가부시키가이샤 | Molten steel casting method, continuous casting slab manufacturing method and bearing steel manufacturing method |
| CN114746195A (en) * | 2019-11-29 | 2022-07-12 | 杰富意钢铁株式会社 | Method for casting molten steel, method for producing continuously cast slab, and method for producing steel for bearing |
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