JPH0717936B2 - Continuous casting method for Ti-containing steel - Google Patents
Continuous casting method for Ti-containing steelInfo
- Publication number
- JPH0717936B2 JPH0717936B2 JP1150478A JP15047889A JPH0717936B2 JP H0717936 B2 JPH0717936 B2 JP H0717936B2 JP 1150478 A JP1150478 A JP 1150478A JP 15047889 A JP15047889 A JP 15047889A JP H0717936 B2 JPH0717936 B2 JP H0717936B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- continuous casting
- nozzle
- index
- molten 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.)
- Expired - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 42
- 239000010959 steel Substances 0.000 title claims description 42
- 238000009749 continuous casting Methods 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 5
- 238000005266 casting Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000002436 steel type Substances 0.000 description 5
- 230000003749 cleanliness Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Landscapes
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明Tiを含有する鋼の連続鋳造に関し、特に溶鋼の
注入を司るノズルの閉塞を防止しようとするものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to continuous casting of steel containing Ti, and particularly to prevent clogging of a nozzle for injecting molten steel.
鋼の連続鋳造において取鍋ノズルおよびタンディッシュ
ノズルの閉塞を防止できれば、１ノズル当たりの鋳造チ
ャージ数が増加することにより、歩留りおよび生産性は
向上する。特にTiを含有する鋼の連続鋳造では、一般的
なアルミキルド鋼に比較してノズルが閉塞し易いため、
その意義は大きい。If it is possible to prevent clogging of the ladle nozzle and the tundish nozzle in continuous casting of steel, the yield and productivity are improved by increasing the number of casting charges per nozzle. Especially in continuous casting of steel containing Ti, the nozzle is more likely to be clogged than general aluminum killed steel,
Its significance is great.
（従来の技術） Tiを含有する鋼の連続鋳造におけるノズルの閉塞防止方
法について、特開昭61−1457号および同63−63558号各
公報には金属Caを添加することが記載されているが、金
属Caは高価であるため経済的ではない。(Prior Art) Regarding the method of preventing nozzle clogging in the continuous casting of steel containing Ti, JP-A-61-1457 and JP-A-63-63558 describe adding metal Ca. However, metal Ca is expensive and not economical.
また特公昭56−29730号公報にはAlの含有量を0.003wt％
（以下単に％と示す）未満に調整することが示されてい
るが、Al含有量が少ないため鋼中に残存している酸素は
Tiと化合してTiO2になり、Ti含有量が減少するほか、Ti
O2はAl2O3と比較して比重が大きいので鋼中より浮上し
にくく溶鋼内に残存するためノズル閉塞の誘因となる。
さらにAlによる脱酸は期待出来ないので、鋼の清浄度が
低下する場合もある。Japanese Patent Publication No. 56-29730 discloses that the content of Al is 0.003 wt%.
Although it has been shown to adjust the amount to less than (hereinafter simply referred to as%), the oxygen content remaining in the steel is
When combined with Ti, it becomes TiO 2 , which reduces the Ti content.
Since O 2 has a larger specific gravity than Al 2 O 3, it does not easily float above the steel and remains in the molten steel, which causes nozzle clogging.
Furthermore, since deoxidation by Al cannot be expected, the cleanliness of the steel may decrease.
さらに、Ti含有鋼の連続鋳造は溶鋼を途切れることなく
供給するため、チャージが進ほどTi酸化物のノズル内付
着量が増加する傾向にあり、ノズル閉塞の発生し易い環
境となるため、溶鋼の注入量に応じた対策が必要にな
る。Further, since continuous casting of Ti-containing steel supplies molten steel without interruption, the amount of Ti oxide deposited in the nozzle tends to increase as the charge progresses, resulting in an environment in which nozzle clogging easily occurs. It is necessary to take measures depending on the injection amount.
（発明が解決しようとする課題） そこでこの発明は、溶鋼注入の際にノズル詰まりがなく
かつ清浄度の高いTi入り鋼種の得られる、溶鋼の注入量
に応じた、有利な連続鋳造方法について提案することを
目的とする。(Problem to be Solved by the Invention) Therefore, the present invention proposes an advantageous continuous casting method, which can obtain a Ti-containing steel type that does not cause nozzle clogging at the time of pouring molten steel and has high cleanliness, depending on the injection amount of molten steel. The purpose is to do.
（課題を解決するための手段） この発明は、Tiを0.010wt％以上含有する鋼を連続鋳造
するに当たり、 溶鋼をモールドに注入するに先立ち、その溶鋼注入量に
応じて、少なくとも下記式を満足する量のAlを添加し、
脱酸調整を行ってノズルの閉塞を防止することを特徴と
するTi含有鋼の連続鋳造方法。(Means for Solving the Problems) In the present invention, when continuously casting a steel containing 0.010 wt% or more of Ti, prior to pouring molten steel into a mold, at least the following formula is satisfied according to the molten steel pouring amount. The amount of Al
A continuous casting method for Ti-containing steel, characterized in that deoxidation is adjusted to prevent nozzle clogging.
記 Al/Ti≧1.6×10-6χ2−６×10-4χ＋0.6 ここでχ：溶鋼注入量（ｔ） この発明で対称とするTi含有鋼は、鋼中の酸素と化合し
た高融点のTi酸化物を核として溶鋼の凝固が生じてノズ
ルが閉塞され易い。これに対して鋼中の酸素と化合した
Al酸化物はスラグとなって湯面に浮上するため、ノズル
閉塞の原因になりにくい。Note Al / Ti ≧ 1.6 × 10 -6 χ 2 -6 × 10 -4 χ + 0.6 where χ: Molten steel injection amount (t) The Ti-containing steel that is symmetric in the present invention has a high content of oxygen in the steel. Molten steel is solidified around the Ti oxide having a melting point as a nucleus, and the nozzle is easily clogged. On the other hand, combined with oxygen in steel
Since the Al oxide becomes slag and floats on the surface of the molten metal, it is unlikely to cause nozzle clogging.
したがって鋼中の酸素はAlによって脱酸することが有利
で、上記式を満足する含有量のAlを残すことでTi酸化物
の生成を回避し、鋼の清浄化およびノズル閉塞の防止を
両立するわけである。Therefore, it is advantageous to deoxidize the oxygen in the steel with Al, and by keeping the content of Al that satisfies the above formula, the formation of Ti oxide is avoided, and the cleaning of the steel and the prevention of nozzle clogging are both achieved. That is why.
（作用） 次にこの発明の基礎となった実験結果について詳しく述
べる。(Operation) Next, the experimental results which are the basis of the present invention will be described in detail.
まずタンディッシュ内に注入するTi含有量0.01〜0.10％
の溶鋼に、Al含有量が種々の値となる脱酸調整を施し、
得られたそれぞれの鋼種を、ヒートサイズ250t（片スト
ランド当たり125t）を１チャージとして、１〜５連の連
続鋳造に供したときのタンディッシュノズルの詰まりに
ついて調査した結果を、第１図に示す。なお鋳造には２
ストランドスラブ連鋳機を用いた。同図において、縦軸
はノズル詰まり指数（以下指数と称す）、すなわち単位
スループット当たりのS/N開度｛cm2／（t/min）｝を示
し、同図に示す実験結果から、この指数が6.0以下であ
ればノズル詰まりの発生はなく、一方指数が10をこえる
と鋳込みに支障をきたすことが判明した。なお、横軸に
はAlのTiとの比Al/Tiを示した。First, the Ti content to be injected into the tundish is 0.01 to 0.10%
The molten steel of, Al content was subjected to deoxidation adjustment to various values,
Fig. 1 shows the results of an examination of the clogging of the tundish nozzle when each of the obtained steel types was subjected to continuous casting of 1 to 5 stations with a heat size of 250 t (125 t per one strand) as one charge. . 2 for casting
A strand slab continuous casting machine was used. In the figure, the vertical axis shows the nozzle clogging index (hereinafter referred to as the index), that is, the S / N opening per unit throughput {cm 2 / (t / min)}. From the experimental results shown in the figure, this index It was found that if the value was 6.0 or less, the nozzle was not clogged, while if the index exceeded 10, it hindered casting. The abscissa shows the ratio of Al to Ti, Al / Ti.
この上記の実験によって、連続鋳造の連々数によって指
数が増加することも判明したので、各連続鋳造での指数
と１チャージでの指数との差を各連々数（チャージ数）
で割って求めた、１チャージ当たりの指数の増加量を調
べた結果について、Al/Tiとの関係において第２図に示
す。From the above experiment, it was also found that the index increases with the number of consecutive castings. Therefore, the difference between the index of each continuous casting and the index of one charge is the number of each (charge number).
Fig. 2 shows the relationship between Al / Ti and the results of examining the amount of increase in the index per charge obtained by dividing by.
第１図に示したように指数が10をこえると鋳込みに支障
が生じるため指数を10以下に抑える必要があり、第２図
から例えば５連（合計10チャージ）の連続鋳造では１チ
ャージ当たりの指数の増加量を1.0以下に抑えること、
同様に６連（合計12チャージ）では0.8以下に抑えるこ
と、によって各連続鋳造の指数は10以下となる。そし
て、指数の増加を抑えるにはAl/Tiを,5連で0.85以上
に、６連で1.05以上にすればよい。As shown in Fig. 1, if the index exceeds 10, the casting will be hindered, so it is necessary to keep the index to 10 or less. From Fig. 2, for example, in continuous casting of 5 stations (total 10 charges) Keeping the index increase below 1.0,
Similarly, by keeping the value of 0.8 or less for 6 stations (12 charges in total), the index of each continuous casting becomes 10 or less. Then, in order to suppress the increase in the index, Al / Ti may be set to 0.85 or more for 5 stations and 1.05 or more for 6 stations.
そこで連続鋳造の連々数と、各連続鋳造の指数を10以下
に抑えるのに必要なAl/Tiの下限との関係を求めると第
３図に示すようにしなる。Therefore, the relationship between the number of consecutive castings and the lower limit of Al / Ti required to keep the index of each continuous casting below 10 is obtained as shown in FIG.
同図からわかるように、Al/Tiの下限は次式（１）にて
表すことができる。As can be seen from the figure, the lower limit of Al / Ti can be expressed by the following equation (1).
Al/Ti≧0.025x2−0.075x＋0.6……（１） ここでx:鋳込みチャージ数 この（１）式を溶鋼の注入量1t当たりに換算すると、１
チャージが125t（250t/2）であるから、次式（２）が得
られる。Al / Ti ≧ 0.025x 2 −0.075x + 0.6 (1) where x is the number of casting charges When this equation (1) is converted per 1t of molten steel injection,
Since the charge is 125t (250t / 2), the following equation (2) is obtained.
Al/Ti≧1.6×10-6χ2−６×10-4χ＋0.6……（２） ここでχ：溶鋼注入重量（ｔ） 上記（２）式に従うAl含有量を確保することにより、ノ
ズル閉塞は回避される。Al / Ti ≧ 1.6 × 10 −6 χ 2 −6 × 10 −4 χ + 0.6 (2) where χ: Molten steel injection weight (t) By ensuring the Al content according to the above formula (2), Nozzle blockage is avoided.
なお同様の条件での鋼中Al含有量と鋼中酸素含有量との
関係を第４図に示すように、Al含有量に応じて鋼の清浄
度も向上することがわかる。As shown in FIG. 4 showing the relationship between the Al content in the steel and the oxygen content in the steel under the same conditions, it can be seen that the cleanliness of the steel also improves depending on the Al content.
次いでこの発明における脱酸調整について説明する。Next, the deoxidation adjustment in the present invention will be described.
まず脱酸調整後のTi含有量を0.010％としたのは、Ti:0.
010未満であれば、ノズル詰りが顕著には発生しないた
めであり、この発明は、0.010％以上になって始めて効
果を発揮するものである。First, the Ti content after deoxidation adjustment was set to 0.010% because Ti: 0.
This is because if it is less than 010, nozzle clogging does not occur remarkably, and the present invention is effective only when the content becomes 0.010% or more.
また脱酸調整後のAl含有量は、上記した式（２）に従う
下限を確保する必要があるのは上述の通りである。一方
Al含有量の上限は特に限定しないが、合金成分の原単位
を低減させるという意味では、できる限り下限に近いこ
とが望ましい。As described above, it is necessary to secure the lower limit of the Al content after the deoxidation adjustment according to the above formula (2). on the other hand
The upper limit of the Al content is not particularly limited, but it is desirable that it is as close to the lower limit as possible in the sense of reducing the basic unit of the alloy component.
（実施例） 1000tまでの連続鋳造の達成を目標として、脱酸調整後
の取鍋分析値が表１に示すとおりである各鋼種を、サイ
ズ260×1300mmのモールドにて鋳込み速度1.4m/minで連
続鋳造に供した。なお、鋼種Ｂ〜Ｉは、溶鋼注入量を10
00tとして、上記式（２）で導いたAl/Ti比に従ってAl添
加量を決定した。(Example) With the goal of achieving continuous casting up to 1000 tons, each steel grade whose ladle analysis value after deoxidation adjustment is as shown in Table 1 is cast in a mold of size 260 x 1300 mm at a casting speed of 1.4 m / min. Was used for continuous casting. Steel types B to I have a molten steel injection amount of 10
The amount of Al added was determined according to the Al / Ti ratio derived from the above formula (2) as 00t.
なお取鍋とタンディッシュとの間は、Arガス（10〜15l/
min）にてシールし無酸化雰囲気とした。Ar gas (10-15l / between the ladle and the tundish)
(min) and sealed in a non-oxidizing atmosphere.
鋼種ＡおよびＡ′は鋳造開始と同時にノズル詰まりが生
じ、250tを注入した時点でノズル閉塞のため、鋳造を続
行するのが不可能となった。これに対して、この発明に
従う鋼種Ｂ〜Ｉは、目標とする1000tを注入してもノズ
ル詰まりは発生せずに安定した連続鋳造が可能であっ
た。 Nozzles were clogged with steel types A and A'at the start of casting, and the nozzles were clogged when 250 t was injected, so that it was impossible to continue casting. On the other hand, the steel types B to I according to the present invention were capable of stable continuous casting without causing nozzle clogging even when the target 1000 t was injected.
（発明の効果） この発明によれば、Ti含有鋼の連続鋳造におけるノズル
の閉塞を回避できるため作業の軽減を図れ、さらに１ノ
ズル当たりの溶鋼注入量は大幅に増加するので歩留まり
および生産性の著しい向上を基体できる。(Effect of the Invention) According to the present invention, it is possible to avoid the clogging of the nozzle in the continuous casting of Ti-containing steel, so that the work can be reduced, and the molten steel injection amount per nozzle is significantly increased, so that the yield and the productivity can be improved. A significant improvement can be based.
第１図はAl/Tiとノズル詰まり指数との関係を示すグラ
フ、 第２図はAl/Tiと１チャージ当たりのノズル詰まり指数
増加量との関係を示すグラフ、 第３図は確保すべきAl/Tiと連続鋳造の連々数との関係
を示すグラフ、 第４図は鋼中Al含有量と鋼中酸素含有量との関係を示す
グラフ、 である。Fig. 1 is a graph showing the relationship between Al / Ti and the nozzle clogging index, Fig. 2 is a graph showing the relationship between Al / Ti and the nozzle clogging index increase per charge, and Fig. 3 is the Al to be secured. Fig. 4 is a graph showing the relationship between / Ti and the number of consecutive castings, and Fig. 4 is a graph showing the relationship between the Al content in steel and the oxygen content in steel.
Claims (1)
するに当たり、 溶鋼をモールドに注入するに先立ち、その溶鋼注入量に
応じて、少なくとも下記式を満足する量のAlを添加し、
脱酸調整を行ってノズルの閉塞を防止することを特徴と
するTi含有鋼の連続鋳造方法。 記 Al/Ti≧1.6×10-6χ2−６×10-4χ＋0.6 ここでχ：溶鋼注入量（ｔ）1. When continuously casting a steel containing 0.010 wt% or more of Ti, prior to injecting molten steel into a mold, an amount of Al satisfying at least the following formula is added according to the amount of molten steel injected,
A continuous casting method for Ti-containing steel, characterized in that deoxidation is adjusted to prevent nozzle clogging. Note Al / Ti ≧ 1.6 × 10 -6 χ 2 -6 × 10 -4 χ + 0.6 where χ: Molten steel injection amount (t)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1150478A JPH0717936B2 (en) | 1989-06-15 | 1989-06-15 | Continuous casting method for Ti-containing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1150478A JPH0717936B2 (en) | 1989-06-15 | 1989-06-15 | Continuous casting method for Ti-containing steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0317219A JPH0317219A (en) | 1991-01-25 |
| JPH0717936B2 true JPH0717936B2 (en) | 1995-03-01 |
Family
ID=15497770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1150478A Expired - Fee Related JPH0717936B2 (en) | 1989-06-15 | 1989-06-15 | Continuous casting method for Ti-containing steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0717936B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3525891B2 (en) * | 1999-12-14 | 2004-05-10 | Ｊｆｅスチール株式会社 | Continuous casting method of small section high Cr steel |
| KR100889684B1 (en) * | 2002-12-18 | 2009-03-19 | 주식회사 포스코 | Method of manufacturing titanium-containing stainless steel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5857487B2 (en) * | 1976-05-06 | 1983-12-20 | 日新製鋼株式会社 | Method for improving the surface quality of titanium-containing ferritic stainless steel |
| JPS52133827A (en) * | 1976-05-06 | 1977-11-09 | Nisshin Steel Co Ltd | Block preventing mrthod of nozzle in case of pouring treatment of molten steel containing titanium |
| JPS6245457A (en) * | 1985-08-20 | 1987-02-27 | Nippon Stainless Steel Co Ltd | Continuous casting method for titanium-containing steel |
-
1989
- 1989-06-15 JP JP1150478A patent/JPH0717936B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0317219A (en) | 1991-01-25 |
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