JPH01272714A - Method and apparatus for regulating composition with continuous casting tundish - Google Patents
Method and apparatus for regulating composition with continuous casting tundishInfo
- Publication number
- JPH01272714A JPH01272714A JP10229088A JP10229088A JPH01272714A JP H01272714 A JPH01272714 A JP H01272714A JP 10229088 A JP10229088 A JP 10229088A JP 10229088 A JP10229088 A JP 10229088A JP H01272714 A JPH01272714 A JP H01272714A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- tundish
- vacuum refining
- continuous casting
- 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
- 239000000203 mixture Substances 0.000 title claims description 21
- 238000000034 method Methods 0.000 title claims description 17
- 238000009749 continuous casting Methods 0.000 title claims description 12
- 230000001105 regulatory effect Effects 0.000 title abstract 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 63
- 239000010959 steel Substances 0.000 claims abstract description 63
- 238000007670 refining Methods 0.000 claims abstract description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 239000000654 additive Substances 0.000 claims abstract description 5
- 230000001174 ascending effect Effects 0.000 claims abstract 3
- 238000007664 blowing Methods 0.000 claims abstract 2
- 230000000630 rising effect Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002436 steel type Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000009628 steelmaking Methods 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
- B22D11/113—Treating the molten metal by vacuum treating
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、連続鋳造タンディツシュによる溶鋼の成分調
整方法及び装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for adjusting the composition of molten steel using a continuous casting tundish.
（従来の技術）
鋼の性質を変えるための一つの方法として鋼の成分を変
えることがあり、要求される性質を確保するために鋼の
成分調整が行なわれている。(Prior Art) One method for changing the properties of steel is to change the composition of the steel, and the composition of steel is adjusted to ensure the required properties.
転炉製鋼法においては、一般的に溶銑の成分調整と転炉
での精錬時の成分調整、さらにはＲＨでの微調整により
要求される鋼の成分にｉ１４整している。In the converter steel manufacturing method, the required steel composition is generally adjusted by adjusting the composition of hot metal, adjusting the composition during refining in the converter, and finely adjusting the RH.
（発明が解決しようとする課題）
この成分調整方法は１チヤージの量が１００〜３００ト
ンであることがら、小ロフトの鋼を袈遺するには適して
おらず、要求量以上の鋼を製造して、要求量をユーザー
へ、残りを在庫として保留せざるを得ない問題がある。(Problem to be solved by the invention) This component adjustment method is not suitable for producing steel with a small loft because the amount per charge is 100 to 300 tons. However, there is a problem in that the requested amount must be sent to the user and the remaining amount must be held as inventory.
このため、最近タンディツシュに所要成分元素またはそ
の合金を添加して成分を調整し、小ロフトの鋼種を製造
する方法が提案されている。たとえば、特開昭５４−１
５８３３２号公報には、タンディツシュの片側に所要成
分元素の合金を連続添加し、それぞれのストランドへ遵
法することによりストランド毎の鋼種を変え、小ロフト
の生産を可能とする方法が開示されている。また、特開
昭６１−１４７９５３号公報においても、同様にタンデ
ィツシュにおいて必要な合金を添加してそれぞれのスト
ランドにて異鋼種の鋳片を同時に製造する方法が開示さ
れている。さらに、特開昭６２−８６１１３号公報には
、真空精錬炉を用いて、取鍋等溶鋼容器中の溶鋼を導入
管により真空精錬炉内に導入し、導出管を閉とし、炉内
でガスバブリングしながら合金鉄を添加して精錬し、精
錬後導出管からタンディツシュ等の鋳造用容器に排出す
ることが示されている。For this reason, a method has recently been proposed in which a required component element or an alloy thereof is added to the tundish to adjust the composition to produce a steel grade with a small loft. For example, JP-A-54-1
Publication No. 58332 discloses a method in which an alloy of required elements is continuously added to one side of a tundish, and the steel type for each strand is changed by complying with the law to each strand, thereby making it possible to produce a small loft. Further, Japanese Patent Application Laid-Open No. 147953/1984 also discloses a method for simultaneously producing slabs of different steel types from each strand by adding necessary alloys to the tundish. Furthermore, in JP-A-62-86113, using a vacuum smelting furnace, molten steel in a molten steel container such as a ladle is introduced into the vacuum smelting furnace through an inlet pipe, the outlet pipe is closed, and gas is It is shown that ferroalloy is added and refined while bubbling, and after refining, it is discharged from a discharge pipe into a casting container such as a tundish.
しかしながら、特開昭５４−１５８３３２号公報、特開
昭６１−１４７９５３号公報に示される方法には、添加
した元素が均等に分散せず、鋼の不均一が発生し、また
添加する合金が溶鋼中に溶は込む割合（歩留）が一定で
はなく、フィードパック調整もできないことから、目標
成分に適中しない等の大きな問題点があり、実施されて
いない。However, in the methods shown in JP-A No. 54-158332 and JP-A No. 61-147953, the added elements are not evenly dispersed, resulting in non-uniformity of the steel, and the alloy to be added is mixed into the molten steel. Since the rate of infiltration (yield) is not constant and it is not possible to adjust the feed pack, there are major problems such as failure to hit target components, and this has not been implemented.
また、特開昭６２−８６１１３号公報に示される方法は
、溶鋼容器中の溶鋼を循環させて精錬することができず
、精錬効率が劣ると共に目標成分に適中しない等大きな
問題がある。Furthermore, the method disclosed in Japanese Patent Application Laid-Open No. 62-86113 cannot refining by circulating the molten steel in the molten steel container, and has major problems such as poor refining efficiency and failure to reach target components.
本発明は、これらの問題点を解決し、タンディツシュで
所要の成分元素または合金等の添加物を添加し、目標成
分の均一な鋼が精度よ（得られ、小ロットの製造に対応
できる成分１Ｍ！！方法及び装置を提供する。さらには
、鋼の品質に大きく影響するタンディツシュ内の溶鋼の
温度がコントロールでき、また鍋からタンディツシュへ
注入する際の外気の巻き込みによるＮ２．０２のピック
アップによる鋼の品質悪化対策である脱Ｎ２、脱０２が
で終る溶鋼の成分子＄１９Ｅ方法及び装置を提供する。The present invention solves these problems, adds the necessary constituent elements or additives such as alloys in the tundish, and produces steel with a uniform target composition with high precision (with a composition of 1M, which can be used for small-lot production). !!Provides a method and device.Furthermore, the temperature of molten steel in the tundish, which greatly affects the quality of steel, can be controlled, and the temperature of the molten steel in the tundish, which greatly affects the quality of the steel, can be controlled, and the temperature of the molten steel can be controlled by the pickup of N2.02 due to the entrainment of outside air when pouring from the pot into the tundish. Provided is a method and apparatus for removing molten steel components by removing N2 and O2 as countermeasures against quality deterioration.
（ａ題を解決するための手段）
本発明方法は、連続鋳造タンディツシュによる成分調整
方法において、タンディツシュから鋳型への流路を閏と
し、タンディツシュ上に設けた真空精錬容器の上昇管、
下降管を介して溶鋼を循環させ、循環する真空精錬容器
中の溶鋼に添゛加物を添加して溶鋼成分を調整すること
を特徴とする連続鋳造タンディツシュによる成分調整方
法である。(Means for Solving Problem A) The method of the present invention is a composition adjustment method using a continuous casting tundish, in which a flow path from the tundish to the mold is used as a funnel, and a riser pipe of a vacuum refining vessel provided on the tundish;
This is a composition adjustment method using a continuous casting tundish, which is characterized by circulating molten steel through a downcomer and adjusting the composition of the molten steel by adding additives to the circulating molten steel in a vacuum refining vessel.
真空精錬容器中の溶鋼に酸素を吹込んで昇温することは
好ましい。本発明装置は、連続儲逍タンディツシュの上
部に真空精錬容器を配置し、真空精錬容器の溶鋼上昇管
、下降管を定常操業時におけるタンディッシェ内溶鋼レ
ベルより下位に位置させると共に、真空精錬容器上部に
添加物の添加装置を設けたことを特徴とする連続鋳造タ
ンディツシュによる成分ａ整装置である。タンディツシ
ュに対して真空精錬容器が別個に上下動可能であり、真
空精錬容器内に酸素ノズルを設けることは好ましい。It is preferable to blow oxygen into the molten steel in the vacuum refining vessel to raise the temperature. In the device of the present invention, a vacuum refining vessel is placed in the upper part of a continuous production tundish, and the molten steel rising pipe and down-going pipe of the vacuum refining vessel are positioned below the molten steel level in the tundish during normal operation, and the vacuum refining vessel is placed in the upper part of the vacuum refining vessel. This is a component a adjustment device using a continuous casting tundish, which is characterized by being equipped with an additive addition device. It is preferable that the vacuum refining vessel can be moved up and down separately with respect to the tundish, and that an oxygen nozzle is provided within the vacuum refining vessel.
（作用）
本発明ではタンディツシュにおいて小ロットの鋼を製造
するため、−旦連続鵞造機を停止するとともにタンディ
ツシュから鋳型への流路を閉とし、タンディツシュ内の
溶鋼を循環しながら所要元素を添加し、目標の成分に適
中した時点で循環を中止し、叢造を再開し、異鋼種を９
１造する。この際、タンディツシュへの注入時及び循環
時にピックアップした溶鋼中のＮ２．０□、さらにはタ
ンディツシュのレンガの水分等からピックアップした溶
鋼中のＮ２は真空中で溶鋼を循環し、脱ガスして除去す
る。＊た、同時に問題となる循環中の熱量ロスによる溶
鋼の温度低下を補償するために、真空精錬容器中に金属
たとえばＡ１を添加したり、酸素を吹き込んだりする。(Function) In the present invention, in order to manufacture small lots of steel in a tundish, the continuous steel making machine is stopped and the flow path from the tundish to the mold is closed, and the required elements are added while circulating the molten steel in the tundish. When the target composition is reached, the circulation is stopped and the massing is restarted, adding 9 different steel types.
Build one. At this time, the N2.0□ in the molten steel picked up during injection into the tundish and during circulation, as well as the N2 in the molten steel picked up from moisture in the bricks of the tundish, are removed by circulating the molten steel in a vacuum and degassing. do. *In addition, in order to compensate for the temperature drop of molten steel due to heat loss during circulation, which is a problem at the same time, a metal such as A1 is added to the vacuum refining vessel or oxygen is blown into the vessel.
（実施例） 第１図、第２図は本発明の一実施例を示す。(Example) FIGS. 1 and 2 show an embodiment of the present invention.
タンディツシュ６の上部に真空精錬容器１を上下動自在
に設け、タンディツシュ６内の溶鋼１２を真空精錬容器
１に導く上昇管３と真空精錬容器１内の溶鋼をタンディ
ツシュ６に導く下降管２を共にタンディツシュ６内に配
置しである。そして、タンディツシュ６は溶鋼を鋳型へ
排出するイマーシ１ンノズル１０を１個乃至複数個有し
、また中央部には堰８を有する。また、真空精錬容器１
には金属ホッパー１３、所要元素ホッパー１４を設け、
必要に応じて酸素ノズル１７を設ける。A vacuum refining container 1 is provided on the upper part of the tundish 6 so as to be movable up and down, and a riser pipe 3 for guiding the molten steel 12 in the tundish 6 to the vacuum refining container 1 and a descending pipe 2 for guiding the molten steel in the vacuum refining container 1 to the tundish 6 are both connected. It is placed inside the tandish 6. The tundish 6 has one or more immersion nozzles 10 for discharging molten steel into the mold, and has a weir 8 in the center. In addition, vacuum refining container 1
is equipped with a metal hopper 13 and a required element hopper 14,
An oxygen nozzle 17 is provided as necessary.
成分調整に際しては、まず連続鋳造機を停止するととも
にスライディングノズル１１でタンディツシュ６から鋳
型への流路を閉とする。そして、タンディツシュ６内の
溶鋼１２の一部を真空精錬容器１内に吸い上げるととも
に、上昇管３内の溶鋼にＡｒ等の不活性〃スをノズル４
により吹き込み、溶鋼をタンディツシュ６、上昇管３、
真空精錬容器１、下降管２、タンディツシュ６と循環さ
せる。循環する溶鋼中に金属及び／又は所要元素を金属
ホッパー１３、所要元素ホッパー１４から添加し、溶鋼
の成分を調整する。さらには、真空の容器内の９＃環す
る溶鋼中に酸素を吹き込み、溶鋼の昇温を行なうことが
好ましい。When adjusting the components, first the continuous casting machine is stopped and the flow path from the tundish 6 to the mold is closed by the sliding nozzle 11. A part of the molten steel 12 in the tundish 6 is sucked up into the vacuum refining vessel 1, and an inert gas such as Ar is injected into the molten steel in the riser pipe 3 through the nozzle 4.
The molten steel is blown into the tundish 6, riser pipe 3,
It is circulated through the vacuum refining vessel 1, downcomer pipe 2, and tundish 6. Metals and/or required elements are added to the circulating molten steel from a metal hopper 13 and a required element hopper 14 to adjust the composition of the molten steel. Furthermore, it is preferable to blow oxygen into the 9-ring molten steel in a vacuum container to raise the temperature of the molten steel.
目標の温度、成分に調整されると再度スライディングノ
ズル１１を開とし、連続ａｉ８１１の鋳型にイマージ鱈
ン／ズル１０を通して注入し、鋳片とする。これにより
小ロフトの清浄度の高い鋼の製造が可能となる。When the target temperature and composition are adjusted, the sliding nozzle 11 is opened again, and the cod is injected into the continuous AI811 mold through the image nozzle/zzle 10 to form a slab. This makes it possible to manufacture highly clean steel with a small loft.
タンディツシュ６で大ロフトの鋼を通常通り鋳造するな
ど真空精錬容器１が不要の場合は、上下装置ｓにて上昇
管３、下降管２と共に真空精錬容器１全体を上昇し、タ
ンディツシュ６内の溶鋼レベルよりも上昇管３及び下降
管２の下端が上位になるように溶鋼より引き上げておく
。When the vacuum refining vessel 1 is not needed, such as when casting steel with a large loft in the tundish 6 as usual, the entire vacuum refining vessel 1 is raised together with the riser pipe 3 and the descender pipe 2 using the up-and-down device s, and the molten steel in the tandish 6 is removed. It is raised above the molten steel so that the lower ends of the rising pipe 3 and the descending pipe 2 are above the level.
（発明の効果）
本発明により、従来の製造工程を大幅に変更することな
く所要成分、温度、高清浄度の小ロフト溶鋼の製造を可
能とし、また従来の多量の注文外品を製造せざる゛を得
なかった問題を解決する。よって、近年多様化するユー
ザーの要求に迅速に無駄なく対応することができる。(Effects of the Invention) The present invention makes it possible to produce small-loft molten steel with the required composition, temperature, and high cleanliness without significantly changing the conventional production process, and also eliminates the need to produce a large number of off-order products. Solve the problem for which you did not get ゛. Therefore, it is possible to respond quickly and efficiently to the demands of users, which have become increasingly diverse in recent years.
第１図、第２図は本発明の一実施例を示す図であり、第
１図は縦断面図、第２図は平面図である。
１・・・真空精錬容器、２・・・下降管、３・・・上昇
管、４・・・ノズル、５・・・上下装置、６・・・タン
ディツシュ、７・・・耐火物、８・・・堰、９・・・７
ランノ、１０・・・イマージッンノズル、１１・・・ス
ライディングノズル、１２・・・溶鋼、１３・・・金属
ホッパー、１４・・・所要元素ホッパー、１５・・・切
出弁、１６・・・注入口、１７・・・酸素ノズル。1 and 2 are diagrams showing one embodiment of the present invention, with FIG. 1 being a longitudinal sectional view and FIG. 2 being a plan view. DESCRIPTION OF SYMBOLS 1... Vacuum refining container, 2... Descending pipe, 3... Rising pipe, 4... Nozzle, 5... Up/down device, 6... Tundish, 7... Refractory, 8... ...Weir, 9...7
Runno, 10... Imagin nozzle, 11... Sliding nozzle, 12... Molten steel, 13... Metal hopper, 14... Required element hopper, 15... Cutting valve, 16... - Inlet, 17...Oxygen nozzle.
Claims (4)
いて、タンディッシュから鋳型への流路を閉とし、タン
ディッシュ上に設けた真空精錬容器の上昇管、下降管を
介して溶鋼を循環させ、循環する真空精錬容器中の溶鋼
に添加物を添加して溶鋼成分を調整することを特徴とす
る連続鋳造タンディッシュによる成分調整方法。(1) In the composition adjustment method using a continuous casting tundish, the flow path from the tundish to the mold is closed, and the molten steel is circulated through the ascending pipe and descending pipe of the vacuum refining vessel provided on the tundish. A composition adjustment method using a continuous casting tundish, which is characterized by adding additives to molten steel in a vacuum refining vessel to adjust the composition of the molten steel.
請求項１記載の連続鋳造タンディッシュによる成分調整
方法。(2) A composition adjustment method using a continuous casting tundish according to claim 1, wherein the temperature is increased by blowing oxygen into the molten steel in the vacuum refining vessel.
配置し、真空精錬容器の溶鋼上昇管、下降管を定常操業
時におけるタンディッシュ内溶鋼レベルより下位に位置
させると共に、真空精錬容器上部に添加物の添加装置を
設けたことを特徴とする連続鋳造タンディッシュによる
成分調整装置。(3) A vacuum refining container is placed above the continuous casting tundish, and the molten steel rising pipe and descending pipe of the vacuum refining container are positioned below the molten steel level in the tundish during normal operation, and the molten steel is added to the top of the vacuum refining container. A component adjustment device using a continuous casting tundish, characterized by being equipped with a substance addition device.
下動可能であり、真空精錬容器内に酸素ノズルを設けた
請求項３記載の連続鋳造タンディッシュによる成分調整
装置。(4) The component adjustment device using a continuous casting tundish according to claim 3, wherein the vacuum refining container can be moved up and down separately with respect to the tundish, and an oxygen nozzle is provided in the vacuum refining container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10229088A JPH01272714A (en) | 1988-04-25 | 1988-04-25 | Method and apparatus for regulating composition with continuous casting tundish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10229088A JPH01272714A (en) | 1988-04-25 | 1988-04-25 | Method and apparatus for regulating composition with continuous casting tundish |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01272714A true JPH01272714A (en) | 1989-10-31 |
Family
ID=14323481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10229088A Pending JPH01272714A (en) | 1988-04-25 | 1988-04-25 | Method and apparatus for regulating composition with continuous casting tundish |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01272714A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04235213A (en) * | 1991-01-10 | 1992-08-24 | Sumitomo Metal Ind Ltd | Method for heating molten steel in ladle |
| JPH06344094A (en) * | 1993-06-07 | 1994-12-20 | Sumitomo Metal Ind Ltd | Method and apparatus for divided refining |
-
1988
- 1988-04-25 JP JP10229088A patent/JPH01272714A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04235213A (en) * | 1991-01-10 | 1992-08-24 | Sumitomo Metal Ind Ltd | Method for heating molten steel in ladle |
| JPH06344094A (en) * | 1993-06-07 | 1994-12-20 | Sumitomo Metal Ind Ltd | Method and apparatus for divided refining |
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