JPH0413452A - Method for adding metal la into molten steel - Google Patents
Method for adding metal la into molten steelInfo
- Publication number
- JPH0413452A JPH0413452A JP11675290A JP11675290A JPH0413452A JP H0413452 A JPH0413452 A JP H0413452A JP 11675290 A JP11675290 A JP 11675290A JP 11675290 A JP11675290 A JP 11675290A JP H0413452 A JPH0413452 A JP H0413452A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- content
- metal
- steel
- continuous casting
- 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 55
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 239000002184 metal Substances 0.000 title claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 238000009749 continuous casting Methods 0.000 abstract description 13
- 239000006104 solid solution Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 abstract description 2
- 239000011261 inert gas Substances 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
Ｌａは、溶鋼中の酸素あるいはＳと反応してＬａ −０
Ｘｙ−５ｕｌｐｈｉｄｅとなり、これが浸漬ノズルの内
壁に付着してノズルを閉塞させることから、Ｌａ含有率
の高い綱を連続鋳造するのは従来不可能であった。[Detailed Description of the Invention] (Industrial Application Field) La reacts with oxygen or S in molten steel to form La −0
Since the Xy-5 ulfide adheres to the inner wall of the immersion nozzle and blocks the nozzle, it has been impossible to continuously cast a steel with a high La content.
この発明は溶鋼中への金属Ｌａの添加方法に工夫を加え
ることによって安定した連続鋳造を実現しようとするも
のである。This invention attempts to realize stable continuous casting by adding innovation to the method of adding metal La to molten steel.
（従来の技術）
従来、Ｌａを０．０５％以上含有する鋼においては連続
鋳造を適用することが不可能であったため、鋳型内に金
属Ｌａをあらかじめセットしておき、ここに溶鋼を注入
して所定の形状になる鋳塊を得る造塊法が適用されてき
た。しかしながら、かかる造塊法でもＬａを均一に添加
するのは非常に困難であって、この点に関しては例えば
、発明者らによる別の特願平１−２６２１２８のように
鋳型の断面形状にあわせて添加するＬａ量を調整し、均
一なＬａ含有鋼を得る方法を提案している。しかし、造
塊法の場合、溶鋼の注入能率が低く、しかも製造コスト
が高いという不利があった。当然ながら連鋳化のための
試みもなされてはいるが、Ｌａは上述したように溶鋼中
の酸素あるいはＳと反応し、Ｌａ−０Ｘｙ−５ｈｌρｈ
ｉｄｅとなり連続鋳造の際、タンデイツシュからモール
ドへの溶鋼注入に際してノズル内にこれらが付着し、短
時間のうちにノズル閉塞を起こすため溶鋼の注入が継続
できなくなってしまう問題があった。とくにＬａ濃度が
高い時はこの傾向が著しく、未だ有効な平文てがないの
が現状であった。(Prior art) Conventionally, it was impossible to apply continuous casting to steel containing 0.05% or more of La, so metal La was set in advance in a mold and molten steel was poured into it. The ingot forming method has been used to obtain an ingot with a predetermined shape. However, it is very difficult to uniformly add La even with this agglomeration method. We have proposed a method to obtain uniform La-containing steel by adjusting the amount of La added. However, the ingot forming method has the disadvantages of low injection efficiency of molten steel and high manufacturing cost. Naturally, attempts have been made to achieve continuous casting, but as mentioned above, La reacts with oxygen or S in the molten steel, and La-0Xy-5hlρh
During continuous casting, these particles adhere to the inside of the nozzle when pouring molten steel from the tundish into the mold, causing the nozzle to become clogged within a short period of time, making it impossible to continue pouring molten steel. This tendency is particularly pronounced when the La concentration is high, and there is currently no effective plaintext method.
（発明が解決しようとする課題）
Ｌａを溶鋼中に多量に添加し、Ｌａ含有量０．０６％以
上を含有する溶鋼を溶製しつづいてこれをタンデイツシ
ュから浸漬ノズルを介して連鋳モールド内に注入し、高
Ｌａ含有鋼の連鋳鋳片を得んとする場合Ｌａは酸素との
結合力が非常に強いため４Ｌａ ＋３（Ｓｔｏｗ） →
２（ＬａｇＯｓ） ＋３Ｓｉ −（１）２Ｌａ
＋（ＡｌｚＯｚ） →（ＬａｇＯｓ） ＋２ＡＩ
−（２）などの反応がおきＬａは容易に他の酸化
物を還元しＬａ−酸化物となる。またこれと同時に、Ｌ
ａ 十Ｓ →（ＬａＳ）
・・・（３）の反応も容易に生じる。これらの反応に
よって生じるＬａ−０Ｘｙ−５ｕｌｐｈｉｄｅはノズル
内面に付着し、浸漬ノズル内に早期に異物が付着し、溶
鋼の流れを防げるため連鋳化が達成されていなかったの
である。(Problems to be Solved by the Invention) A large amount of La is added to molten steel, and molten steel containing La content of 0.06% or more is continuously produced, and then the molten steel is poured from a tundish through a dipping nozzle into a continuous casting mold. If you want to obtain continuously cast slabs of high La-containing steel by injecting 4La + 3 (Stow) → because La has a very strong bonding force with oxygen.
2(LagOs) +3Si −(1)2La
+(AlzOz) →(LagOs) +2AI
A reaction such as -(2) occurs, and La easily reduces other oxides to become La-oxide. At the same time, L
a 10S → (LaS)
...The reaction (3) also occurs easily. La-0Xy-5ulfide produced by these reactions adheres to the inner surface of the nozzle, causing foreign matter to adhere to the inside of the immersion nozzle at an early stage, preventing the flow of molten steel, and thus making it impossible to achieve continuous casting.
この発明は高Ｌａ含有鋼を鋳造する場合でもノズル詰り
を起こすことがなく、安定した鋳造が実現できる新規な
方法を提案することを目的とする。The purpose of this invention is to propose a new method that can achieve stable casting without causing nozzle clogging even when casting high La content steel.
（課題を解決するための手段）
Ｌａは前述のように酸化物あるいは硫化物を容易に形成
するけれども、高温−耐酸化性を有する鋼の製造のため
には固溶Ｌａが必要となる。(Means for Solving the Problems) Although La easily forms oxides or sulfides as described above, solid solution La is required for producing steel with high temperature oxidation resistance.
この発明は所定の固溶Ｌａを確保しつつＬａの酸化物／
硫化物によるノズル詰りを防止して、連続鋳造による鋳
造を可能とするため、Ｌａ添加時の溶鋼成分を次のよう
に規定した。This invention provides an oxide of La while ensuring a predetermined solid solution of La
In order to prevent nozzle clogging due to sulfides and enable continuous casting, the composition of molten steel when adding La was specified as follows.
すなわち、この発明は、溶鋼中に金属Ｌａを添加するに
当たり、予め溶鋼中の酸素量を２０ｐｐｍ以下、Ｓ含有
量を５０ｐｐｍ１以下に調整しておき、しかる後に該溶
鋼中へ金属Ｌａを添加することを特徴とする溶鋼中への
金属Ｌａの添加方法である。That is, when adding metal La to molten steel, this invention requires adjusting the oxygen content in the molten steel in advance to 20 ppm or less and the S content to 50 ppm or less, and then adding metal La to the molten steel. This is a method of adding metal La to molten steel, characterized by the following.
（作 用）
Ｌａの含有率の高い溶鋼、例えばＬａを０．０６％以上
含む溶鋼を連続鋳造する場合には、鋳造の初期からノズ
ル内部に異物が体積し、この現象は第１図に示すように
Ｌａの添加量が増えるに従い顕著にあられれる。このよ
うな現象はＡＩ入りの鋼とかＴｉ入りの鋼等の他の鋼種
においても発生しているが、とくに高Ｌａ鋼の場合その
傾向が顕著であった。ノズル内の付着物の成分を分析す
ると、Ｌａｍ０ｔｔＳｏであってＬａ、０３は融点が２
２５０°Ｃ，ＬａＳは２２００°Ｃであり、これらの融
点は非常に高く、これらがノズル内壁に付着しているた
めにノズル詰りか生じていたのである。(Function) When continuously casting molten steel with a high content of La, for example, molten steel containing 0.06% or more of La, foreign matter accumulates inside the nozzle from the beginning of casting, and this phenomenon is shown in Figure 1. This becomes more noticeable as the amount of La added increases. Although such a phenomenon occurs in other steel types such as AI-containing steel and Ti-containing steel, this tendency was particularly remarkable in the case of high-La steel. Analysis of the components of the deposit inside the nozzle revealed that it was Lam0ttSo and La,03 had a melting point of 2.
250°C and 2200°C for LaS, which have very high melting points, and because they adhered to the inner wall of the nozzle, the nozzle was clogged.
Ｌａの添加時の溶鋼中のＯ９Ｓ含有量とノズル詰りの関
係を調査した結果を第２図および第３図に示すが上掲第
２図、第３図より、ノズル詰りを極力抑制するためには
Ｌａ添加前の溶鋼中の０．Ｓ濃度を０≦２０ｐｐ■、Ｓ
≦５０ｐｐ−とすることが有効であって、これにより高
濃度のＬａ含有鋼でも安定して鋳造が継続できる。Figures 2 and 3 show the results of investigating the relationship between O9S content in molten steel and nozzle clogging when La is added. is 0.0 in molten steel before adding La. S concentration 0≦20pp■, S
It is effective to set the content to ≦50 pp-, which allows stable casting to be continued even with high-concentration La-containing steel.
（実施例）
高温−耐酸化性の鋼（特開昭６３−４５３５１号公報参
照）として、例えばＣ： ０．０４％ Ｓｔ ： ０．
３％ Ｍｎ：０．２％ Ｐ：≦０．０２％ Ｓ：≦０．
００１％ ＾ｌ：５．０％ Ｃｒ ： ２０％ Ｌａ
： ０．０８％の鋼が開発されているが、このような成
分組成になる鋼を、第４図に示すような装置を採用して
連続鋳造を行った。(Example) As a high temperature-oxidation resistant steel (see JP-A-63-45351), for example, C: 0.04% St: 0.
3% Mn: 0.2% P: ≦0.02% S: ≦0.
001% ^l: 5.0% Cr: 20% La
: 0.08% steel has been developed, and steel with such a composition was continuously cast using an apparatus as shown in FIG.
なお、この際の連続鋳造においては、取鍋１内の溶鋼は
取鍋１の下部に設けたスライディングノズル２を経由さ
せてタンデイシュ３内に注入するようにしであるが、こ
の間に溶鋼が大気に触れて再酸化されないように注入ポ
ット４及びシール部材５を設置して、溶鋼の供給空間内
にＡｒガスなどの不活性ガスを導入しつつ溶鋼中のＬａ
含有量が所定の値となるように溶鋼の供給空間内へ通じ
る添加バイブロを通してＬａを添加した。In this continuous casting, the molten steel in the ladle 1 is injected into the tundish 3 via the sliding nozzle 2 provided at the bottom of the ladle 1, but during this time the molten steel is exposed to the atmosphere. The injection pot 4 and the sealing member 5 are installed to prevent re-oxidation by contact with the molten steel, and while an inert gas such as Ar gas is introduced into the molten steel supply space, the La in the molten steel is
La was added through an addition vibro connected to the molten steel supply space so that the content was at a predetermined value.
その結果、この発明に従い連続鋳造を行った場合におい
てはノズル詰まりは全く発生しないことが確かめられた
。As a result, it was confirmed that no nozzle clogging occurred when continuous casting was performed according to the present invention.
（発明の効果）
かくしてこの発明によれば高Ｃｒ、高Ａｌ、高Ｌａを含
有する高温、耐酸化性鋼の連続鋳造の際に発生していた
ノズル詰まりを回避して安定した鋳造ができるようにな
り、生産効率の向上ひいては生産コストを有利に低減で
きる。(Effects of the Invention) Thus, according to the present invention, stable casting can be achieved by avoiding nozzle clogging that occurs during continuous casting of high temperature, oxidation resistant steel containing high Cr, high Al, and high La. As a result, production efficiency can be improved and production costs can be advantageously reduced.
第１図はＬａ （ＴＯＴＡＬ）濃度とノズル詰りの関係
を示したグラフ
第２図はＬａ （ＴＯＴＡＬ）濃度とノズル詰りの関係
を示したグラフ
第３図はＬａ （ＴＯＴＡＬ）濃度とノズル詰りの関係
を示したグラフ
第４図は実施例で採用した装置の要部断面図である。
ｌ・・・取鍋 ２・・・スライディングノ
ズル３・・・タンデイツシュ ４・・・注入ポット５
・・・シール治具 ６・・・添加パイプ７・・・
タンデイツシュ内溶鋼
８・・・イマージョンノズル
９・・・連続鋳造用鋳型
第１
Ｌａ ５５ノＦ ｔｚ）ｔｒｖｒＡｔ、ノ第２図
第３図Fig. 1 is a graph showing the relationship between La (TOTAL) concentration and nozzle clogging. Fig. 2 is a graph showing the relationship between La (TOTAL) concentration and nozzle clogging. Fig. 3 is a graph showing the relationship between La (TOTAL) concentration and nozzle clogging. FIG. 4 is a sectional view of the main parts of the device employed in the example. l...Ladle 2...Sliding nozzle 3...Tanditushu 4...Injection pot 5
... Seal jig 6 ... Addition pipe 7 ...
Molten steel in tandem shell 8... Immersion nozzle 9... Continuous casting mold No. 1
Claims (1)
の酸素量を２０ｐｐｍ以下、Ｓ含有量を５０ｐｐｍ以下
に調整しておき、しかる後に該溶鋼中へ金属Ｌａを添加
することを特徴とする溶鋼中への金属Ｌａの添加方法。1. When adding metal La to molten steel, the oxygen content in the molten steel is adjusted in advance to 20 ppm or less and the S content to 50 ppm or less, and then metal La is added to the molten steel. A method of adding metal La to molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11675290A JPH0413452A (en) | 1990-05-08 | 1990-05-08 | Method for adding metal la into molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11675290A JPH0413452A (en) | 1990-05-08 | 1990-05-08 | Method for adding metal la into molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0413452A true JPH0413452A (en) | 1992-01-17 |
Family
ID=14694883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11675290A Pending JPH0413452A (en) | 1990-05-08 | 1990-05-08 | Method for adding metal la into molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0413452A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11345657B2 (en) | 2016-10-19 | 2022-05-31 | Hydro-Quebec | Sulfamic acid derivatives and processes for their preparation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63274743A (en) * | 1987-04-30 | 1988-11-11 | Nippon Steel Corp | Austenitic alloy having high cracking resistance under hydrogen sulfide-containing environment |
-
1990
- 1990-05-08 JP JP11675290A patent/JPH0413452A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63274743A (en) * | 1987-04-30 | 1988-11-11 | Nippon Steel Corp | Austenitic alloy having high cracking resistance under hydrogen sulfide-containing environment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11345657B2 (en) | 2016-10-19 | 2022-05-31 | Hydro-Quebec | Sulfamic acid derivatives and processes for their preparation |
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