JP3393803B2 - Insulation agent for molten steel in container - Google Patents
Insulation agent for molten steel in containerInfo
- Publication number
- JP3393803B2 JP3393803B2 JP35468497A JP35468497A JP3393803B2 JP 3393803 B2 JP3393803 B2 JP 3393803B2 JP 35468497 A JP35468497 A JP 35468497A JP 35468497 A JP35468497 A JP 35468497A JP 3393803 B2 JP3393803 B2 JP 3393803B2
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- heat retaining
- retaining agent
- agent
- container
- 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 - Fee Related
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、容器内溶鋼の保温
剤に関するものである。TECHNICAL FIELD The present invention relates to a heat retaining agent for molten steel in a container.
【０００２】[0002]
【従来の技術】連続鋳造装置のタンディシュ等容器内溶
鋼の保温剤として、ＣａＯとＡｌ2 Ｏ 3 の含有率をＣａ
Ｏ／Ａｌ2 Ｏ3 で０．５〜１．０、且つＭｇＯ５〜３０
％、ＳｉＯ2 １０％以下にした液相保温剤に、ＣａＯと
Ａｌ2 Ｏ3 の含有率がＣａＯ／Ａｌ2 Ｏ3 で０．５未満
または２．０超からなる中空焼結体を５〜９０％含有し
た溶鋼の保温剤が特開平８−３３９６０号公報に開示さ
れている。2. Description of the Related Art Melting in a container such as a tundish of a continuous casting machine
As a heat retaining agent for steel, CaO and Al2O 3Content of Ca
O / Al2O30.5-1.0, and MgO5-30
%, SiO2Liquid phase heat insulation made 10% or less, with CaO
Al2O3Content of CaO / Al2O3Less than 0.5
Or containing 5 to 90% of a hollow sintered body consisting of more than 2.0
A heat retaining agent for molten steel disclosed in Japanese Patent Laid-Open No. 8-33960
Has been.
【０００３】[0003]
【発明が解決しようとする課題】上記のごとき溶鋼の保
温剤においては、溶鋼表面へ被覆した保温剤の液相保温
剤の粘度が低いために嵩密度の小さい中空焼結体を使用
しても液相保温剤と中空焼結体が混合して、液相保温剤
が中空焼結体に付着・固化し保温剤全体が、ポーラス状
の固形状態になり、ポーラス部分から空気が侵入し溶鋼
と接触して溶鋼中に酸素をピックアップし、鋼材の特性
を損うことになる等の課題がある。本発明は、このよう
な課題を有利に解決するためなされたものであり、確実
に溶鋼表面の液相保温剤上層に固体保温剤を分離被覆し
て、液相保温剤で溶鋼と空気との接触を遮断し溶鋼への
酸素のピクッアップを防止するとともに、上層の固体保
温剤で溶鋼を確実に保温ことのできる容器内溶鋼の保温
剤を提供することを目的とするものである。In the heat retaining agent for molten steel as described above, even if a hollow sintered body having a small bulk density is used because the viscosity of the liquid temperature retaining agent of the heat retaining agent coated on the surface of the molten steel is low. When the liquid phase heat retaining agent and the hollow sintered body are mixed, the liquid phase heat retaining agent adheres to the hollow sintered body and solidifies, and the whole heat retaining agent becomes a porous solid state, and air penetrates from the porous portion to form molten steel. There is a problem that oxygen is picked up in the molten steel when it comes into contact with the steel and the characteristics of the steel material are impaired. The present invention has been made in order to advantageously solve such a problem, by separating and coating the solid heat retaining agent on the liquid phase heat retaining agent upper layer of the molten steel surface surely, the liquid phase heat retaining agent of molten steel and air It is an object of the present invention to provide a heat retaining agent for molten steel in a container, which can prevent contact with oxygen by preventing picking up of oxygen to the molten steel and can reliably retain the molten steel with an upper layer solid heat retaining agent.
【０００４】[0004]
【課題を解決するための手段】本発明の特徴とするとこ
ろは、ＣａＯとＡｌ2 Ｏ3 の含有率をＣａＯ／Ａｌ2Ｏ
3 で０．５〜１．０、ＭｇＯ５〜３０ｗｔ％、ＳｉＯ2
１０超〜２０％ｗｔからなる液相保温剤の上層に、Ｃａ
ＯとＡｌ2 Ｏ3 の含有率をＣａＯ／Ａｌ2 Ｏ3で０．５
未満または２．０超、ＭｇＯ５０〜９０ｗｔ％、からな
る固体保温剤を被覆したことを特徴とする容器内溶鋼の
保温剤である。The feature of the present invention resides in that the content ratio of CaO and Al 2 O 3 is CaO / Al 2 O.
3 0.5~1.0, MgO5~30wt%, SiO 2
On the upper layer of the liquid phase heat insulating agent consisting of more than 10 to 20% wt, Ca
The content of O and Al 2 O 3 with CaO / Al 2 O 3 0.5
A heat retaining agent for molten steel in a container, characterized by being coated with a solid heat retaining agent of less than or more than 2.0 and MgO of 50 to 90 wt%.
【０００５】[0005]
【発明の実施の形態】液相保温剤の機能としては、溶鋼
表面に接触配置して、溶鋼と空気との接触を遮断し溶鋼
の空気酸化を防止するものである。保温剤を液体化する
ためには、ＣａＯとＡｌ2 Ｏ3 の含有率をにはＣａＯ／
Ａｌ2 Ｏ3 で０．５〜１．０とし、保温剤の軟化点をい
っはんに用いられている溶鋼温度以下にする必要があ
る。また、保温剤中のＳｉＯ2 は３ＳｉＯ2 ＋４Ａｌ＝
２Ａｌ2 Ｏ3 ＋３Ｓｉの反応により、溶鋼中でのＡｌと
反応するため、保温剤中の低ＳｉＯ2 化は、鋼材特性を
劣化させるＡｌ2 Ｏ3 の生成防止に効果を発揮する。Ｓ
ｉＯ2 含有量が２０％超になると、保温剤中のＳｉＯ2
と溶鋼中のＡｌの反応速度が急激に速くなり、工業的に
問題となるレベルまでＡｌ2 Ｏ3 量が増加し好ましくな
い。BEST MODE FOR CARRYING OUT THE INVENTION The function of a liquid phase heat insulating agent is that it is placed in contact with the surface of molten steel to block the contact between molten steel and air to prevent air oxidation of the molten steel. In order to liquefy the heat retaining agent, the content ratio of CaO and Al 2 O 3 should be CaO /
It is necessary to adjust the softening point of the heat-retaining agent to 0.5 to 1.0 with Al 2 O 3 and also to keep it below the temperature of the molten steel used. In addition, SiO 2 in the heat retaining agent is 3SiO 2 +4 Al =
2Al by reacting 2 O 3 +3 Si, to react with Al in the molten steel, low SiO 2 reduction in the heat retaining agent is effective in preventing the formation of Al 2 O 3 degrading steel properties. S
When the iO 2 content exceeds 20%, SiO 2 in the heat retaining agent is
Then, the reaction rate of Al in the molten steel rapidly increases, and the amount of Al 2 O 3 increases to a level that is industrially problematic, which is not preferable.
【０００６】しかして、本発明による保温剤を連続鋳造
装置のタンディシュに適用し、空気酸化と保温剤の反応
による溶鋼汚染の防止効果を確認したところ、成分によ
ってはストッパー耐火物の溶損が急激に進行し、長時間
の使用に耐えないことが明らかになった。即ち、ストッ
パーの材質として構成するジルコン（ＺｒＳｉＯ4 ）が
ＣａＯとの反応により溶損することが明らかになった。
また、保温剤の液相化に伴う保温機能の低下も認められ
た。However, when the heat retaining agent according to the present invention was applied to a tundish of a continuous casting apparatus and the effect of preventing molten steel contamination due to the reaction of air oxidation and the heat retaining agent was confirmed, the stopper refractory melted rapidly depending on the composition. It became clear that it could not withstand long-term use. That is, it was revealed that zircon (ZrSiO 4 ) which is a material of the stopper is melted by the reaction with CaO.
In addition, a decrease in the heat retaining function due to the liquid phase of the heat retaining agent was also observed.
【０００７】このようなストッパーの溶損に対して、本
発明者等は前述のごとき保温剤のＣａＯ／Ａｌ2 Ｏ3 の
範囲を見直すとともに、ＭｇＯを添加し、保温剤が固相
化しない範囲で融点を上げストッパー耐火物の溶損防止
を検討した。その結果、ＣａＯ／Ａｌ2 Ｏ3 で１．０よ
り大きい範囲では溶損速度が大きく、ＭｇＯの添加はか
えって溶損速度を高めるが、ＣａＯ／Ａｌ2 Ｏ3 で１．
０以下の範囲では、ＭｇＯを５％以上添加することによ
り、溶損速度が急激に低下し、工業的に使用可能なレベ
ル（溶損速度で０．１ｍｍ／分以下）まで溶損を抑制で
きることが判った。しかし一般に用いられている溶鋼温
度でＭｇＯ含有量が３０％以上になると、保温剤中の液
相は極めて少なくなり、保温剤は溶鋼表面を均一に覆う
ことができず、空気との接触によりＡｌ2 Ｏ3 を生成す
ることになる。従って、液相保温剤のＣａＯとの含有率
は、ＣａＯ／Ａｌ2 Ｏ3 で０．５〜１．０、 ＭｇＯの
含有率は５〜３０％が好ましい。With respect to the melting loss of the stopper, the present inventors have reviewed the range of CaO / Al 2 O 3 of the heat retaining agent as described above, and added MgO so that the heat retaining agent does not solidify. The melting point was raised and the prevention of melting of stopper refractory was investigated. As a result, when CaO / Al 2 O 3 exceeds 1.0, the erosion rate is high, and the addition of MgO rather increases the erosion rate, but when CaO / Al 2 O 3 is 1.
In the range of 0 or less, by adding MgO in an amount of 5% or more, the melt loss rate sharply decreases, and it is possible to suppress the melt loss to an industrially usable level (melt loss rate of 0.1 mm / min or less). I understood. However, when the MgO content is 30% or more at the temperature of molten steel that is generally used, the liquid phase in the heat retaining agent becomes extremely small, the heat retaining agent cannot uniformly cover the surface of the molten steel, and the heat retaining agent causes Al to contact with air. 2 O 3 will be produced. Therefore, the content of CaO / Al 2 O 3 in the liquid phase heat retaining agent is preferably 0.5 to 1.0, and the content of MgO is preferably 5 to 30%.
【０００８】一方、保温機能の低下によるタンディシュ
での溶鋼温度の低下を補償するためには、転炉や二次精
錬時での溶鋼処理温度を高める必要があるが、処理温度
の増加は転炉や取鍋の耐火物の寿命を短命にする。そこ
で、保温性の良い保温剤を上記のごとき液相保温剤の上
層に被覆することを検討した。On the other hand, in order to compensate for the lowering of the molten steel temperature in the tundish due to the lowering of the heat retaining function, it is necessary to raise the molten steel processing temperature in the converter or the secondary refining, but the increase in the processing temperature causes the converter temperature to increase. Shorten the life of refractory in ladle and ladle. Therefore, it was studied to coat the heat retaining agent having a good heat retaining property on the upper layer of the liquid phase heat retaining agent as described above.
【０００９】即ち、上層に被覆する固体保温剤の機能と
しては、液相保温剤と反応せず、しかも溶融（液相化）
しないことが必要であり、そのためには、液相保温剤と
主成分を同様にするとともに、固体保温剤の軟化点を溶
鋼温度より高くする必要がある。しかして、その主成分
としては、ＣａＯ、Ａｌ2 Ｏ3 で、上記液相保温剤とは
逆にＣａＯ／Ａｌ2 Ｏ3 で０．５未満または２．０超の
含有率とすることによって、液相保温剤との反応を防止
し、しかも軟化点を一般に用いられている溶鋼温度より
高くすることができる。また、ＭｇＯを５０〜９０％含
有することによって、確実に保温剤を固体化することが
でき、溶鋼の保温機能を具備することができる。That is, the function of the solid heat retaining agent coated on the upper layer is that it does not react with the liquid heat retaining agent and is melted (liquefied).
It is necessary not to do so, and for that purpose, it is necessary to make the liquid phase heat retaining agent the same as the main component and to make the softening point of the solid heat retaining agent higher than the molten steel temperature. Then, the main components thereof are CaO and Al 2 O 3 , and the content of CaO / Al 2 O 3 is less than 0.5 or more than 2.0, contrary to the above liquid phase heat retaining agent. It is possible to prevent the reaction with the liquid phase heat retaining agent and further to make the softening point higher than the temperature of the molten steel which is generally used. Further, by containing MgO in an amount of 50 to 90%, the heat retaining agent can be reliably solidified, and the heat retaining function of the molten steel can be provided.
【００１０】上記液相保温剤と固体保温剤の混合を防止
するためには、液相保温剤中のＳｉＯ2 の含有量を１０
％超にする必要がある。１０％以下では、液相保温剤の
粘性が低下し、上層に被覆する固体保温剤と混合して、
液相保温剤が固体保温剤に付着固化し、保温剤全体がポ
ーラス状の固形状態になり、ポーラス部分から侵入した
空気と溶鋼が接触して溶鋼中に酸素をピックアップし、
鋼材の特性を損うことになる。かくして、液相保温剤中
のＳｉＯ2 を１０％超にすることによって、液相保温剤
の粘性を高めることができ、上層に被覆する固体保温剤
との混合を防止できる。従って、液相保温剤中のＳｉＯ
2 含有量は、前述の溶鋼との反応によるＡｌ2 Ｏ3 生成
の上限と併せて、１０超〜２０％以下とするものであ
る。In order to prevent the liquid phase heat retaining agent and the solid heat retaining agent from being mixed, the content of SiO 2 in the liquid phase heat retaining agent should be 10% or less.
It must be over%. If it is 10% or less, the viscosity of the liquid phase heat insulating agent decreases, and it mixes with the solid heat insulating agent that coats the upper layer,
The liquid phase heat retaining agent adheres to the solid heat retaining agent and solidifies, the whole heat retaining agent becomes a porous solid state, the air invading from the porous portion comes into contact with the molten steel, and oxygen is picked up in the molten steel,
This will impair the properties of the steel material. Thus, by making SiO 2 in the liquid phase heat retention agent to exceed 10%, the viscosity of the liquid phase heat retention agent can be increased and mixing with the solid heat retention agent coated on the upper layer can be prevented. Therefore, SiO in the liquid phase heat retaining agent
The 2 content, together with the upper limit of Al 2 O 3 production by the reaction with the molten steel described above, is set to more than 10 to 20% or less.
【００１１】このように液相保温剤よって、溶鋼表面と
空気の接触を遮断し、その上層に被覆する固体保温剤に
よって溶鋼を保温するものであり、その容器内溶鋼とし
ては、例えば連続鋳造装置のタンディシュまたは取鍋内
溶鋼等の保温剤として有効に適用することができる。As described above, the liquid phase heat insulating agent shuts off the contact between the surface of the molten steel and the air, and the solid heat insulating agent covering the upper layer keeps the molten steel warm. The molten steel in the container is, for example, a continuous casting device. It can be effectively applied as a heat retaining agent for molten steel in tundish or ladle.
【００１２】しかして、このような容器内溶鋼の表面全
面に前記のごとき、液相保温剤を配置して溶鋼を保温す
ることができるが、保温すべき個所として例えば、溶鋼
の抜熱の大きい個所として、溶鋼表面のストッパー周
辺、別容器の溶鋼注入ノズル浸漬位置周辺の容器内溶鋼
表面及び容器内壁の溶鋼表面近傍にのみ固体保温剤を液
相保温剤の上層に被覆することによって、この部位の温
度降下による強固なスラグ層の生成付着を防止して、容
器底部の溶鋼注入口のストッパーによる開閉制御の向
上、取鍋交換時の操業トラブル防止及び容器内耐火物の
メンテナンス性の向上等を図ることができる。このよう
に容器内溶鋼の保温部位にのみ固体保温剤を被覆するこ
とによって、固体保温剤の使用量を低減し低コストで保
温することができ、溶鋼表面保温部位の少なくとも３０
０ｍｍの範囲に固体保温剤を液相保温剤の表面に被覆す
ることにより、確実に保温することができる。Thus, the liquid phase heat insulating agent as described above can be arranged on the entire surface of the molten steel in the container to keep the molten steel warm. However, as a place to be kept warm, for example, the heat removal of the molten steel is large. As a point, by coating the solid heat retaining agent on the upper layer of the liquid heat retaining agent only around the stopper on the molten steel surface, the molten steel surface inside the vessel around the immersion position of the molten steel injection nozzle of another container and the molten steel surface on the inner wall of the vessel The formation and adhesion of a strong slag layer due to the temperature drop of the container is prevented, the opening and closing control by the stopper of the molten steel injection port at the bottom of the container is improved, the operation trouble is prevented when the ladle is replaced, and the refractory inside the container is improved in maintainability. Can be planned. In this way, by coating the solid heat retaining agent only on the heat retaining portion of the molten steel in the container, it is possible to reduce the amount of the solid heat retaining agent used and keep it warm at low cost.
By covering the surface of the liquid phase heat retaining agent with the solid heat retaining agent in the range of 0 mm, the heat can be reliably retained.
【００１３】[0013]
【実施例】次に、本発明の実施例を比較例とともに挙げ
る。表１〜３は、実施例。表４〜６は、比較例で、比較
例１は、液相保温剤のみによる保温。比較例２、３は、
液相保温剤のＳｉＯ2 含有量が本発明外。比較例４、５
は、液相保温剤のＣａＯ／Ａｌ2 Ｏ3 が本発明外。比較
例６、７は、液相保温剤のＭｇＯ含有量が本発明外。比
較例８は、固体保温剤のＣａＯ／Ａｌ2 Ｏ3が本発明
外。比較例９、１０は、固体保温剤のＭｇＯ含有量が本
発明外。EXAMPLES Next, examples of the present invention will be given together with comparative examples. Tables 1-3 are examples. Tables 4 to 6 are comparative examples, and Comparative example 1 is heat retention only with the liquid phase heat retaining agent. Comparative Examples 2 and 3
The content of SiO 2 in the liquid heat retaining agent is outside the scope of the present invention. Comparative Examples 4 and 5
The liquid phase heat insulating agent CaO / Al 2 O 3 is outside the scope of the present invention. In Comparative Examples 6 and 7, the MgO content of the liquid phase heat retaining agent was outside the scope of the present invention. In Comparative Example 8, CaO / Al 2 O 3 as a solid heat retaining agent is outside the scope of the present invention. In Comparative Examples 9 and 10, the MgO content of the solid heat retaining agent is outside the scope of the present invention.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【表２】（表１のつづき） [Table 2] (Continued from Table 1)
【００１６】[0016]
【表３】（表２のつづき） [Table 3] (Continued from Table 2)
【００１７】注１：溶鋼は、普通鋼で、連続鋳造装置の
タンディシュ（６０ｔ容器、表面積１０ｍ2 ）内溶鋼を
保温した。
注２：被覆個所は、全面は溶鋼表面全面に保温剤を配置
または被覆。一部は、タンディシュ底部溶鋼注入口を開
閉するストッパー周辺、取鍋からの溶鋼注入用浸漬ノズ
ル周辺及びタンディシュ内壁３００ｍｍの溶鋼表面。
注３：溶損速度は、ストッパー（材質ジルコン）の溶損
速度。
注４：出側酸素量は、タンディシュ入側溶鋼中の全酸素
量に対するタンディシュ出側溶鋼中の全酸素量の上昇
量。
注５：欠陥発生個数は、酸化物系介在物による製品（鋳
片寸法：厚み２５０ｍｍ×巾１５００ｍｍ×長さ８５０
０ｍｍの鋳片を通常の熱間圧延工程、冷間圧延工程を経
て厚さ０．７ｍｍ×巾１５００ｍｍの冷延鋼板とした）
表面欠陥の発生個数。
注６：出側温度降下は、タンディシュ入側溶鋼温度に対
してタンディシュ出側の溶鋼温度の降下量。Note 1: Molten steel is ordinary steel, and the molten steel in the tundish (60 t container, surface area 10 m 2 ) of the continuous casting apparatus was kept warm. Note 2: As for the coating area, the heat insulating agent is placed or coated on the entire surface of the molten steel. Some are around the stopper that opens and closes the molten steel injection port at the bottom of the tundish, around the immersion nozzle for injecting molten steel from the ladle, and the surface of the molten steel with an inner wall of 300 mm. Note 3: Melting rate is that of stopper (material zircon). Note 4: Outlet side oxygen content is the amount of increase in the total oxygen content in the tundish outlet side molten steel relative to the total oxygen content in the tundish inlet side molten steel. Note 5: The number of defects is the product of oxide inclusions (slab size: thickness 250 mm x width 1500 mm x length 850
A 0 mm slab was subjected to a normal hot rolling step and a cold rolling step to obtain a cold rolled steel sheet having a thickness of 0.7 mm and a width of 1500 mm)
Number of surface defects. Note 6: The temperature drop on the outlet side is the amount of decrease in the molten steel temperature on the tundish inlet side with respect to the molten steel temperature on the tundish inlet side.
【００１８】[0018]
【表４】 [Table 4]
【００１９】[0019]
【表５】（表４のつづき） [Table 5] (Continued from Table 4)
【００２０】[0020]
【表６】（表５のつづき） [Table 6] (Continued from Table 5)
【００２１】[0021]
【発明の効果】本発明の保温剤によれば、容器内溶鋼の
空気酸化等による汚染が少なく、製品欠陥を減少して歩
留りを向上するとともに、品質を高めることができる。
また、ストッパー等の耐火物の溶損を抑制して、寿命を
延長しコストを軽減することができる。更に、保温機能
が高いので、溶鋼の高温出鋼を避けることができ、容器
の耐火物等の溶損を抑制して、寿命を延長しコストを軽
減することができる等の優れた効果が得られる。EFFECTS OF THE INVENTION According to the heat insulating agent of the present invention, the molten steel in the container is less contaminated by air oxidation and the like, and product defects can be reduced to improve the yield and quality.
Further, it is possible to suppress melting loss of refractory materials such as stoppers, extend the life, and reduce the cost. Furthermore, since it has a high heat retention function, it is possible to avoid high temperature tapping of molten steel, suppress melting loss of refractory etc. of the container, prolong the life and reduce the cost, etc. To be
───────────────────────────────────────────────────── フロントページの続き (72)発明者 笹井 勝浩 千葉県富津市新富20−１ 新日本製鐵株 式会社技術開発本部内 (56)参考文献 特開 平８−33960（ＪＰ，Ａ) 特開 平７−124741（ＪＰ，Ａ) 特開 平４−317451（ＪＰ，Ａ) 特開 平３−198953（ＪＰ，Ａ) 特開 平７−51822（ＪＰ，Ａ) 特開 平６−179059（ＪＰ，Ａ) 特開 平６−170508（ＪＰ，Ａ) 特開 平６−170507（ＪＰ，Ａ) 特開 平５−337617（ＪＰ，Ａ) 特開 平５−293616（ＪＰ，Ａ) 特開 昭56−62662（ＪＰ，Ａ) 特開 平６−24832（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 11/108 B22D 7/10 101 C04B 35/00 C21C 7/00 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Katsuhiro Sasai 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Co., Ltd. Technology Development Division (56) Reference Japanese Patent Laid-Open No. 8-33960 (JP, A) Kaihei 7-124741 (JP, A) JP 4-317451 (JP, A) JP 3-198953 (JP, A) JP 7-51822 (JP, A) JP 6-179059 ( JP, A) JP 6-170508 (JP, A) JP 6-170507 (JP, A) JP 5-337617 (JP, A) JP 5-293616 (JP, A) JP 56-62662 (JP, A) JP-A-6-24832 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B22D 11/108 B22D 7/10 101 C04B 35/00 C21C 7/00
Claims (4)
Ａｌ2 Ｏ3 で０．５〜１．０、ＭｇＯ５〜３０ｗｔ％、
ＳｉＯ2 １０超〜２０ｗｔ％からなる液相保温剤の上層
に、ＣａＯとＡｌ2 Ｏ3 の含有率をＣａＯ／Ａｌ2 Ｏ3
で０．５未満または２．０超、ＭｇＯ５０〜９０ｗｔ
％、からなる固体保温剤を被覆したことを特徴とする容
器内溶鋼の保温剤。1. The content of CaO and Al 2 O 3 is CaO /
Al 2 O 3 0.5-1.0, MgO 5-30 wt%,
The content ratio of CaO and Al 2 O 3 is added to the upper layer of the liquid phase heat insulating agent consisting of SiO 2 in excess of 10 to 20 wt%, CaO / Al 2 O 3
Less than 0.5 or more than 2.0, MgO 50 to 90 wt
%, A heat retaining agent for molten steel in a container, which is coated with a solid heat retaining agent.
を被覆したことを特徴とする請求項１に記載の容器内溶
鋼の保温剤。2. The heat retaining agent for molten steel in a container according to claim 1, wherein a heat retaining portion on the surface of the molten steel in the container is coated with a solid heat retaining agent.
周辺及び容器内壁近傍の溶鋼表面に固体保温剤を被覆し
たことを特徴とする請求項１または請求項２に記載の容
器内溶鋼の保温剤。3. The heat retaining agent for molten steel in a container according to claim 1 or 2, characterized in that the surface of the molten steel in the vicinity of the inlet opening / closing stopper on the surface of the molten steel in the vessel and the surface of the molten steel near the inner wall of the vessel are coated with a solid heat retaining agent. .
容器内溶鋼表面に固体保温剤を被覆したことを特徴とす
る請求項１または請求項２または請求項３に記載の容器
内溶鋼の保温剤。4. The heat insulation of the molten steel in the container according to claim 1, wherein the surface of the molten steel in the container around the immersion position of the molten steel injection nozzle of another container is coated with a solid heat insulating agent. Agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35468497A JP3393803B2 (en) | 1997-12-24 | 1997-12-24 | Insulation agent for molten steel in container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35468497A JP3393803B2 (en) | 1997-12-24 | 1997-12-24 | Insulation agent for molten steel in container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11179500A JPH11179500A (en) | 1999-07-06 |
| JP3393803B2 true JP3393803B2 (en) | 2003-04-07 |
Family
ID=18439214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35468497A Expired - Fee Related JP3393803B2 (en) | 1997-12-24 | 1997-12-24 | Insulation agent for molten steel in container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3393803B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537635B (en) * | 2012-07-11 | 2015-10-21 | 攀钢集团研究院有限公司 | A kind of semi-steel heat-preservation agent and application thereof |
| CN104588607B (en) * | 2015-02-05 | 2017-05-24 | 山西太钢不锈钢股份有限公司 | Continuous casting method of nickel-based stainless steel |
-
1997
- 1997-12-24 JP JP35468497A patent/JP3393803B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11179500A (en) | 1999-07-06 |
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