JPH02142653A - Method for continuously casting steel - Google Patents
Method for continuously casting steelInfo
- Publication number
- JPH02142653A JPH02142653A JP29616188A JP29616188A JPH02142653A JP H02142653 A JPH02142653 A JP H02142653A JP 29616188 A JP29616188 A JP 29616188A JP 29616188 A JP29616188 A JP 29616188A JP H02142653 A JPH02142653 A JP H02142653A
- Authority
- JP
- Japan
- Prior art keywords
- tundish
- powder
- molten steel
- surface coating
- steel
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000005266 casting Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 9
- 239000000843 powder Substances 0.000 claims abstract description 67
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 238000000576 coating method Methods 0.000 claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000009749 continuous casting Methods 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 13
- 230000007547 defect Effects 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 4
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 239000000377 silicon dioxide Substances 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 1
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 1
- 230000003628 erosive effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 241001669679 Eleotris Species 0.000 description 3
- 229910000655 Killed steel Inorganic materials 0.000 description 3
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、鋼を連続鋳造する際に、タンディツシュ内に
添加するパウダによるタンディツシュの溶損を減少し、
アルミナ介在物起因の製品欠陥をなくした鋼の連続鋳造
方法に関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention reduces melting damage of the tundish due to powder added to the tundish during continuous casting of steel,
This invention relates to a continuous steel casting method that eliminates product defects caused by alumina inclusions.
〈従来の技術〉
溶鋼を連続鋳造する際に、取鍋の溶鋼は−Ｈタンディッ
シュに注入され、その後鋳型内に注入される。この取鍋
と鋳型の中間に位置するタンディツシュにおいてはタン
ディツシュ内溶鋼の温度低下防止、タンディツシュ内溶
鋼中に浮遊する介在物の吸着を目的として、通常、溶鋼
表面にパウダを添加する。従来の連続鋳造用クンデイツ
シュに添加されるパウダとし°ζはＣａＯを４０ｗｔ％
（以下％と略す）程度含有し、塩基度０．８〜１．３に
調整したものが一般的である（特開昭５１−１６２１７
号参照）。<Prior Art> When continuously casting molten steel, molten steel in a ladle is poured into a -H tundish and then into a mold. In the tundish located between the ladle and the mold, powder is usually added to the surface of the molten steel for the purpose of preventing the temperature of the molten steel in the tundish from decreasing and adsorbing inclusions floating in the molten steel in the tundish. The powder added to conventional continuous casting kundish is 40wt% CaO.
(hereinafter abbreviated as %), and the basicity is adjusted to 0.8 to 1.3 (Japanese Patent Application Laid-open No. 16217-1983).
(see issue).
しかしながら、この様なパウダを＾！含有量の高い溶鋼
に使用する場合、パウダ中のＳｉｎｇが多いため、（１
）式の反応によって鋼中に７Ｖ８０ユを生成させる。However, powder like this ^! When using molten steel with a high content, since there is a large amount of Sing in the powder, (1
) 7V80U is generated in steel by the reaction of the formula.
／Ｖ＋５ｉＯｔ→Ａ７ｔＯｓ ＋Ｓｉ
（１）一方、先に本出願人が促案じた特開昭５７−１
８４５６３号公報の発明ではＣａＯを４０〜６０％含有
し、５１０□を７％以下に調整し、低融点化、流動性低
下を目的にＣａＦｔを含有したパウダをクンデイツシュ
内に添加した場合、（１）式の反応は、５ｉ０．の景が
少ないため抑制されるが、タンディツシュで長時間使用
した場合パウダ中のＣａＦ□によってタンディツシュ耐
火物が過度に溶…されるという問題がある。/V+5iOt→A7tOs +Si
(1) On the other hand, Japanese Patent Application Laid-Open No. 57-1 proposed by the applicant earlier
In the invention of Publication No. 84563, when powder containing CaO is adjusted to 40 to 60%, 510□ is adjusted to 7% or less, and powder containing CaFt is added to the kundish for the purpose of lowering the melting point and reducing fluidity, (1 ) reaction is 5i0. However, when used for a long time in a tundish, the problem is that the tundish refractory is excessively melted by CaF□ in the powder.
〈発明が解決しようとする課題〉
本発明は、以上の問題に鑑みてなされたもので、タンデ
ィツシュの内壁耐火物を溶ｔＳすることなく、しかもス
ラブ表皮下２〜１０ｍ５のアルミナクラスクーの個数を
低減できる鋼の連続鋳造方法を提供するためになされた
ものである。<Problems to be Solved by the Invention> The present invention has been made in view of the above problems, and it is possible to reduce the number of alumina cracks located 2 to 10 m5 below the surface of the slab without melting the refractories on the inner wall of the tundish. This was done in order to provide a continuous steel casting method that can reduce the amount of steel.
〈課題を解決するための手段〉
本発明は、前述した本発明の出願人の湯面被覆用パウダ
をそのまま使用するが、この湯面被覆パウダがタンディ
ツシュと直接接触しないように、タンディツシュをｉｔ
ハするＣａＦｔを含有しないタンディツシュ保護パウダ
で湯面被覆パウダ外周を囲うことにより、クンデイツシ
ュを保護しようとするものである。<Means for Solving the Problems> In the present invention, the above-mentioned hot water surface coating powder of the applicant of the present invention is used as is, but the tundish is made to
The purpose is to protect the kundish by surrounding the outer periphery of the hot water surface coating powder with a powder that does not contain CaFt.
本発明は、■鋼を連続鋳造する際に、クンデイツシュ湯
面にＣａＯ： ４０〜６０ｗ ｔ％（以下％と略す）。In the present invention, (1) CaO: 40 to 60 wt% (hereinafter abbreviated as %) is added to the kundish hot water surface when continuously casting steel.
Ａｌｔｏｓ ： ２０〜４０％、 ＭｇＯ： ０．
５〜５．０％、Ｃ：０．５〜２．０％、 ＮａｔＯ：
０．１〜５．０％、 ＣＩＩＦ！ ： １〜１０％を
含有し、かつＳｉｎｇを７．０％以下に規制した湯面被
覆パウダを被覆する鋼の連続ｌｔｔ造方法において、前
記湯面被覆パウダの外周をＣａＯ： ３０〜４０％。Altos: 20-40%, MgO: 0.
5-5.0%, C: 0.5-2.0%, NatO:
0.1-5.0%, CIIF! : In a continuous LTT manufacturing method for steel that covers a hot water surface coating powder containing CaO of 1 to 10% and Sing regulated to 7.0% or less, the outer periphery of the hot water surface coating powder contains CaO: 30 to 40%.
５ｉＯｔ ： ３０〜４０％、 ｕ、ｏｓ ：２０％
以下、 ＭｇＯ： １０％以下を含有するクンデイツ
シュ保護パウダで囲い、前記湯面被覆パウダとタンディ
ツシュとの接触を防止しタンディツシュを保護すること
を特徴とする鋼の連続鋳造方法であり、かつ■湯面被覆
パウダに対するタンディツシュ保護パウダの重量比を５
〜２０％とすることを特徴とする前項ｌ記載の鋼の連続
鋳造方法である。5iOt: 30-40%, u, os: 20%
Hereinafter, it is a continuous casting method for steel characterized by protecting the tundish by surrounding it with a tundish protection powder containing 10% or less of MgO to prevent contact between the tundish and the molten metal surface coating powder, and The weight ratio of the tandish protection powder to the coating powder was 5.
20%.
く作 用〉
本発明は、ノズル閉塞を有効に防止すると共に、非金属
介在物の少ない鋳片を得ることができる本出願人が出願
した湯面被覆パウダ（特開昭５７−１８４５６３号参照
）を用いて、ノズル閉塞を防止し、溶鋼中にＮ ｔ Ｏ
ｓ介在物が増加することを防止する。Function> The present invention is directed to a hot water surface coating powder (see JP-A No. 57-184563) filed by the present applicant, which can effectively prevent nozzle clogging and produce slabs with less non-metallic inclusions. is used to prevent nozzle clogging and eliminate N t O in molten steel.
s Prevent inclusions from increasing.
一方、タンディツシュ溶損の原因であるＣａＦｚを全く
含有せず、溶融点が１２００〜１３００°Ｃ程度に保つ
ようなＣａｎ、 Ｓｉｎｇ共に３０〜４０％であり、Ｎ
２Ｏ３介在物の吸収能を悪化さゼないためＡｈＯｓの上
限を２０％と少なくし、かつ流動性などを考慮しパウダ
が硬（ならないようにＭｇＯの上限を１０％′としたク
ンデイツシュ保護パウダを前記湯面被覆パウダの外周を
囲うようにして用いた。従ってクンデイツシュ保護パウ
ダによってＣａＦｔを含む湯面被覆パウダがクンデイツ
シュと直接接触するのを防止でき、タンディツシュ耐火
物のｆ８ ｔｆｉを減少することができる。On the other hand, both Can and Sing contain 30 to 40%, which does not contain any CaFz, which causes tundish melting damage, and maintains the melting point at about 1200 to 1300 °C, and N
The upper limit of AhOs was set to 20% to avoid deterioration of the absorption capacity of 2O3 inclusions, and the upper limit of MgO was set to 10% to prevent the powder from becoming hard, considering fluidity. It was used so as to surround the outer periphery of the hot water surface coating powder.Therefore, the kundish protective powder can prevent the hot water surface covering powder containing CaFt from coming into direct contact with the kundish, and the f8 tfi of the tundish refractory can be reduced.
タンディツシュ保護パウダは、ＣａＦｍを含有する湯面
被覆パウダがタンディツシュと接触するのを防止するた
めのものでありできるだけ少ない方がよいが、以下の研
究結果から本発明では湯面被覆パウダに対してほぼ５〜
２０％のｍ１ｆｔ比の範囲で目的を達成することができ
るとの知見を得たので、この範囲の重量比とした。The purpose of the tandish protection powder is to prevent the hot water surface coating powder containing CaFm from coming into contact with the tundish, and it is better to minimize the amount of the tundish protection powder. 5～
Since it was found that the objective could be achieved within a m/ft ratio of 20%, the weight ratio was set within this range.
すなわち、湯面被覆パウダと保護パウダの適切な重量比
を調査するため、高塩基度の湯面被覆パウダに対する低
塩基度のタンディツシュ保護パウダの重量割合を種々変
化させ、各重量割合におけるタンディツシュ内溶鋼サン
プルのアルミナ介在物数をプロットしたところ第２図に
示すような結果を得た。That is, in order to investigate the appropriate weight ratio of the hot water surface coating powder and the protective powder, the weight ratio of the low basicity tundish protection powder to the high basicity hot water surface coating powder was varied, and the molten steel in the tundish at each weight ratio was When the number of alumina inclusions in the sample was plotted, the results shown in FIG. 2 were obtained.
この第２図から湯面被覆パウダに対するクンデイツシュ
保護パウダの適正な範囲はほぼ５〜２０％であることが
わかる。ここで下限をほぼ５．０％としたのは、はぼ５
．０％未満だと湯面被覆パウダとタンディツシュ保護パ
ウダが混合したとき、湯面被覆パウダのＣａＦｔがタン
ディツシュと接触する恐れがあるためである。From FIG. 2, it can be seen that the appropriate range of the kundish protection powder to the hot water surface coating powder is about 5 to 20%. Here, the lower limit was set at approximately 5.0% because Habo5
．． This is because if it is less than 0%, when the hot water surface coating powder and the tundish protection powder are mixed, there is a possibility that CaFt in the hot water surface coating powder will come into contact with the tundish.
なお、第２図における高塩基度の湯面被覆パウダ５の組
成は、ＣａＯ＋ ６６、１％、 ＡｈＯｓ ： １５
％、 Ｍｇｏ ： ５．２％、Ｃ：１．０％、 Ｎａ
、０： ３．２％、 Ｃａｒｔ ： ４゜０％、
５（ＯＨ： ５．５％であり、低塩基度のタンディツ
シュ保護パウダ６の組成は、ＣａＯ： ３７．１％、
ＳｉＯ□： ３９．２％、ＮｔＯｓ ： ２．４％、
ｈｇｏ： ３．５％、その他： １７．８％である。The composition of the high basicity hot water surface coating powder 5 in FIG. 2 is: CaO+ 66.1%, AhOs: 15
%, Mgo: 5.2%, C: 1.0%, Na
, 0: 3.2%, Cart: 4゜0%,
5 (OH: 5.5%, low basicity tandish protection powder 6 has the following composition: CaO: 37.1%,
SiO□: 39.2%, NtOs: 2.4%,
hgo: 3.5%, others: 17.8%.
〈実施例〉 本発明の具体的な実施例を第１図を用いて説明する。<Example> A specific embodiment of the present invention will be described with reference to FIG.
第１図は、取鍋と鋳型の間に位置するタンディツシュの
一部切断斜視図で、１は取鍋の溶鋼をタンディツシュに
注入する注入ノズル、タンディツシュ蓋２には注入ノズ
ルｌを配設する注入孔３と測温、サンプリングおよび鋳
造前のタンディツシュを加熱するバーナー挿入に用いる
タンディツシュ蓋穴４とパウダ投入穴７とが設けられ、
これらは鋳造前からタンディツシュパウダを添加するま
では、溶鋼の再酸化防止のために密閉されている。Fig. 1 is a partially cutaway perspective view of the tundish located between the ladle and the mold, in which 1 is an injection nozzle for injecting molten steel from the ladle into the tundish, and the tundish lid 2 is equipped with an injection nozzle 1. A hole 3, a tundish cover hole 4 used for temperature measurement, sampling, and insertion of a burner for heating the tundish before casting, and a powder input hole 7 are provided.
These are sealed to prevent re-oxidation of the molten steel from before casting until tanditsu powder is added.
鋼の連続鋳造に際して、前述の高塩基度の湯面被覆パウ
ダ５はこれらの穴から投入される。耐火物の溶損に影響
を与えない前記のタンディツシュ保護パウダ６は、タン
ディツシュ蓋の端に設けたパウダ穴７から投入される。During continuous casting of steel, the above-mentioned high basicity molten metal surface coating powder 5 is introduced through these holes. The tundish protection powder 6, which does not affect the melting of the refractory, is introduced through a powder hole 7 provided at the end of the tundish lid.
このようにしてタンディツシュ湯面が湯面被覆パウダで
被覆され、タンディツシュがタンディツシュ保護パウダ
で保護された状態で連続鋳造が開始される。In this way, the tundish hot water surface is covered with the tundish surface coating powder, and continuous casting is started with the tundish being protected by the tundish protecting powder.
以下により具体的な実施例を説明する。More specific examples will be described below.
ＡＩを０．０４〜０．０５％含有した冷延鋼板用低炭素
アルミキルド綱を１つのクンデイツシュで連続的に１５
００ を鋳造する際、本発明の実施例としてタンディツ
シュ耐火物側に第１表のＡパウダを３０ｋｇ添加し、そ
の内側の領域に第１表のＢパウダを１５０ｋｇ添加した
。また比較例としてＡパウダおよびＢパウダをそれぞれ
単独で添加し、上記実施例と同一の鋼種、同一の条件で
１つのタンディツシュで連続的に１５００ を鋳造した
。これら３種類の鋳造によって実施例の効果を明確にす
るため、鋳造実施回数をｌＯチャンス、つまり１５００
０ ｔとし、それぞれのパウダで鋳造されたスラブ表皮
下２〜１０ｍ＋に存在するアルミナクラスター数と冷延
鋼板表面に発生ずるアルミナ介在物起因のスリーパー欠
陥発生率を調査する一方、鋳造後の耐火物（Ｍｈｏ系）
の溶ｒＪｌｉｍを測定し耐火物溶損指数とした。150% of low carbon aluminum killed steel for cold rolled steel sheets containing 0.04 to 0.05% AI is continuously produced in one kundishu.
When casting 00, 30 kg of powder A shown in Table 1 was added to the tundish refractory side as an example of the present invention, and 150 kg of powder B shown in Table 1 was added to the inner region. Further, as a comparative example, powder A and powder B were added individually, and 1500 mm was continuously cast in one tundish using the same steel type and under the same conditions as in the above example. In order to clarify the effect of the example using these three types of casting, the number of castings was set to 10 chances, that is, 1500.
0 t, and investigated the number of alumina clusters existing 2 to 10 m below the skin of slabs cast with each powder and the incidence of sleeper defects caused by alumina inclusions occurring on the surface of cold rolled steel sheets. (Mho type)
The melt rJlim was measured and used as the refractory corrosion index.
第２表にその結果をまとめて示した。低塩基度のＢパウ
ダの比較例２に比べて高塩基度のΔパウダである比較例
１および実施例は、スラブ表皮下のアルミナクラスター
数が著しく少なく、その結果冷延鋼板表面に発生するス
リーパー欠陥も少ない。Table 2 summarizes the results. Compared to Comparative Example 2, which is a B powder with a low basicity, Comparative Example 1 and Examples, which are Δ powders with a high basicity, have a significantly smaller number of alumina clusters under the slab surface, and as a result, the number of sleepers that occur on the surface of the cold rolled steel sheet is reduced. There are few defects.
一方、実施例の鋳造後のタンディツシュ耐火物の？′８
１ＪＩ Ｎは、比較例１のパウダ使用後のタンディツシ
ュ耐火物の？ａ ＩＪｉｆｆｔを１００として比較する
と１１であり、約１ ／１０に減少する。また比較例２
もタンディツシュ耐火物のｔ８ Ｎ１ ！ｉに関しては
実施例とほぼ同等であるが、スラブ表皮下のアルミナク
ラスター数、スリーパー欠陥発生率は多い。On the other hand, what about the tundish refractories after casting in the examples? '8
1JIN is the tundish refractory after using the powder of Comparative Example 1? When comparing a IJift with 100, it is 11, which is reduced to about 1/10. Also, comparative example 2
Also Tanditshu refractory T8 N1! Regarding i, it is almost the same as the example, but the number of alumina clusters under the slab surface and the incidence of sleeper defects are large.
さらに実施例が比較例１よりアルミナクラスタ、スリー
パー率が少ないのは、耐火物熔１ｎによる溶鋼中への酸
素の混入がない為である。Furthermore, the reason why the alumina cluster and sleeper ratios in the example are lower than in comparative example 1 is because there is no mixing of oxygen into the molten steel due to the refractory melt 1n.
以上の結果から、本発明方法によればタンディツシュ耐
火物のｔ８ ｔｌｉを減少し、かつ鋼中アルミナ介在物
が少ない低炭素アルミキルド鋼鋳片鋳造できることが明
らかである。From the above results, it is clear that according to the method of the present invention, it is possible to reduce the t8 tli of the tundish refractory and to cast a low carbon aluminum killed steel slab with less alumina inclusions in the steel.
第２表
〈発明の効果〉
本発明方法によると、クンデイツシュ耐火物の溶用を減
少し、かつアルミナ介在物起因の製品欠陥が少ない低炭
素アルミキルド鋼鋳片を製造することができた。Table 2 (Effects of the Invention) According to the method of the present invention, it was possible to reduce the use of kundish refractories and to produce low carbon aluminum killed steel slabs with fewer product defects due to alumina inclusions.
第１図は、本発明を説明するためのタンディツシュの一
部切断斜視図、第２図は、低塩基度パウダの添加割合と
溶鋼中アルミナ介在物数との関係を示す特性図である。
１・・・注入ノズル、 ２・・・タンディツシュ蓋、
３・・・注入孔、 ４・・・タンディツシュ型
穴、５・・・湯面被覆パウダ、
６・・・タンディッシェ保護パウダ、
７・・・パウダ投入孔、 ８・・・タンディツシュ。FIG. 1 is a partially cutaway perspective view of a tundish for explaining the present invention, and FIG. 2 is a characteristic diagram showing the relationship between the addition ratio of low basicity powder and the number of alumina inclusions in molten steel. 1... Injection nozzle, 2... Tanditshu lid,
3... Injection hole, 4... Tandish mold hole, 5... Hot water surface coating powder, 6... Tundishe protection powder, 7... Powder injection hole, 8... Tundish.
Claims (2)
ａＯ：４０〜６０ｗｔ％、Ａｌ＿２Ｏ＿３：２０〜４０
ｗｔ％、ＭｇＯ：０．５〜５．０ｗｔ％、Ｃ：０．５〜
２．０ｗｔ％、Ｈａ＿２Ｏ：０．１〜５．０ｗｔ％、Ｃ
ａＦ＿２：１〜１０ｗｔ％を含有し、かつＳｉＯ＿２を
７．０ｗｔ％以下に規制した湯面被覆パウダを被覆する
鋼の連続鋳造方法において、前記湯面被覆パウダの外周
をＣａＯ：３０〜４０ｗｔ％、ＳｉＯ＿２：３０〜４０
ｗｔ％、Ａｌ＿２Ｏ＿３：２０ｗｔ％以下、ＭｇＯ：１
０ｗｔ％以下を含有するタンディッシュ保護パウダで囲
い、前記湯面被覆パウダとタンディッシュとの接触を防
止しタンディッシュを保護することを特徴とする鋼の連
続鋳造方法。(1) When continuously casting steel, C on the tundish surface
aO: 40-60 wt%, Al_2O_3: 20-40
wt%, MgO: 0.5 to 5.0 wt%, C: 0.5 to
2.0wt%, Ha_2O: 0.1-5.0wt%, C
In a continuous casting method for steel coating a surface coating powder containing aF_2: 1 to 10 wt% and with SiO_2 regulated to 7.0 wt% or less, the outer periphery of the surface coating powder is coated with CaO: 30 to 40 wt%, SiO_2: 30-40
wt%, Al_2O_3: 20wt% or less, MgO: 1
A continuous casting method for steel, characterized in that the tundish is protected by surrounding it with a tundish protection powder containing 0 wt% or less to prevent contact between the tundish and the tundish.
ダの重量比を５〜２０％とすることを特徴とする請求項
１記載の鋼の連続鋳造方法。(2) The continuous steel casting method according to claim 1, characterized in that the weight ratio of the tundish protection powder to the hot water surface coating powder is 5 to 20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29616188A JPH02142653A (en) | 1988-11-25 | 1988-11-25 | Method for continuously casting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29616188A JPH02142653A (en) | 1988-11-25 | 1988-11-25 | Method for continuously casting steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02142653A true JPH02142653A (en) | 1990-05-31 |
Family
ID=17829948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29616188A Pending JPH02142653A (en) | 1988-11-25 | 1988-11-25 | Method for continuously casting steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02142653A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5179997A (en) * | 1991-09-12 | 1993-01-19 | Atlantic Metals Corporation | Process for insulating molten steel during continuous casting |
| CN102744381A (en) * | 2012-07-25 | 2012-10-24 | 洛阳市科丰冶金新材料（集团）有限公司 | High-alkalinity tundish covering agent |
| CN103495714A (en) * | 2013-10-23 | 2014-01-08 | 武汉钢铁(集团)公司 | Peritectic steel covering slag containing cobaltous oxide and preparation method thereof |
| CN110548842A (en) * | 2019-10-10 | 2019-12-10 | 万恩同 | Weak electrolyte protective slag |
-
1988
- 1988-11-25 JP JP29616188A patent/JPH02142653A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5179997A (en) * | 1991-09-12 | 1993-01-19 | Atlantic Metals Corporation | Process for insulating molten steel during continuous casting |
| CN102744381A (en) * | 2012-07-25 | 2012-10-24 | 洛阳市科丰冶金新材料（集团）有限公司 | High-alkalinity tundish covering agent |
| CN103495714A (en) * | 2013-10-23 | 2014-01-08 | 武汉钢铁(集团)公司 | Peritectic steel covering slag containing cobaltous oxide and preparation method thereof |
| CN103495714B (en) * | 2013-10-23 | 2016-01-13 | 武汉钢铁(集团)公司 | Containing the peritectic steel covering slag and preparation method thereof of cobalt oxide |
| CN110548842A (en) * | 2019-10-10 | 2019-12-10 | 万恩同 | Weak electrolyte protective slag |
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