JPS63188462A - Continuous casting method - Google Patents
Continuous casting methodInfo
- Publication number
- JPS63188462A JPS63188462A JP1823587A JP1823587A JPS63188462A JP S63188462 A JPS63188462 A JP S63188462A JP 1823587 A JP1823587 A JP 1823587A JP 1823587 A JP1823587 A JP 1823587A JP S63188462 A JPS63188462 A JP S63188462A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- mold
- partition plate
- molten steel
- 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
- 238000009749 continuous casting Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 10
- 239000000843 powder Substances 0.000 claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 238000005192 partition Methods 0.000 claims abstract description 15
- 238000007654 immersion Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 7
- 230000003749 cleanliness Effects 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000002344 surface layer 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は溶融金属の連続鋳造において、モールド内に連
続供給するパウダーの投入方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for continuously supplying powder into a mold in continuous casting of molten metal.
従来の技術
連続鋳造によって製造される鋳片の性状は最終成品の品
質および歩留を左右するため、その製造方法は重要な技
術ポイントである。そのため、モールド内溶鋼の酸化防
止や溶鋼中の非金属介在物吸収あるいは溶鋼と鋳型間の
潤滑性向上を目的としたパウダーを添加し鋳片品質改善
を図っているのが現状である。BACKGROUND OF THE INVENTION Since the properties of slabs manufactured by continuous casting affect the quality and yield of the final product, the manufacturing method is an important technical point. Therefore, currently, powder is added to prevent oxidation of the molten steel in the mold, absorb non-metallic inclusions in the molten steel, or improve the lubricity between the molten steel and the mold in order to improve the quality of the slab.
すなわち、連続鋳造でのパウダーは、拘束性ブレークア
ウトや鋳片表面欠陥(縦割れ、シワキズ′″g)゛防止
のために、溶鋼〜°鋳型間の飼滑と溶鋼の酸化防止、溶
鋼中の介在物吸収などの特性が要求される。そのために
はパウダー特性として適正な溶融パウダープール厚の確
保と溶融後の適正な流動(溶鋼と鋳型間への適正均一な
流入とフィルム厚の確保)が必要である。In other words, powder in continuous casting is used to prevent restraint breakout and slab surface defects (vertical cracks, wrinkles), to provide a lubricant between the molten steel and the mold, to prevent oxidation of the molten steel, and to prevent oxidation of the molten steel. Properties such as inclusion absorption are required.To achieve this, the powder properties must be to ensure an appropriate thickness of the molten powder pool and proper flow after melting (appropriate uniform flow between the molten steel and the mold and ensure a film thickness). is necessary.
この溶融パウダープール厚については鋳造条件、特に鋳
造速度とオシュレーション条件などの影響を受けやすい
が、パウダー厚が不足すると、溶融パウダーが鋳型と溶
鋼間への流入不足をきたし、鋳片縦割れの発生を誘起す
る。また、溶融パウダー厚が極端に過剰になり過ぎると
ベアや皮張りが生じ好ましくない。The thickness of this molten powder pool is easily affected by casting conditions, especially casting speed and oscillation conditions, but if the powder thickness is insufficient, the molten powder will not flow between the mold and the molten steel, resulting in longitudinal cracking of the slab. induce occurrence. Furthermore, if the thickness of the molten powder becomes extremely excessive, bareness or skinning may occur, which is not desirable.
これらの理由から、パウダー厚は6〜10脂−程度、パ
ウダー粘度は約2.0pige程度が、高炭素鋼の場合
、縦割れの発生もなく良好である。一方、後者のパウダ
ーの適性な流動条件は溶融後の粘度で決り、その適正範
囲は鋳型の温度変動による影響は大きいが、溶鋼中から
浮上吸収する介在物量によって変化する0例えば、溶鋼
中より浮上するAll 203系介在物を吸収すると、
パウダー組成は変化し、粘度は高くなる傾向が認められ
る。For these reasons, in the case of high carbon steel, a powder thickness of about 6 to 10 mm and a powder viscosity of about 2.0 pige are preferable without causing vertical cracks. On the other hand, the suitable flow conditions for the latter powder are determined by the viscosity after melting, and the appropriate range is greatly influenced by temperature fluctuations in the mold, but it also changes depending on the amount of inclusions that float up and absorb from the molten steel. When All 203 inclusions are absorbed,
It is observed that the powder composition changes and the viscosity tends to increase.
そのため、多量のM2O3系介在物の吸収が予想される
場合はパウダー粘度の適正範囲を低目の1〜2 poi
se(at 1300℃)にすると良好な状態を保つこ
とができる。Therefore, if a large amount of M2O3-based inclusions are expected to be absorbed, the appropriate powder viscosity range should be set to a lower value of 1 to 2 poi.
se (at 1300° C.), a good condition can be maintained.
また、鋳込み初期に2 poise以上の高粘性パウダ
ーを投入した場合、溶鋼が急激に冷却されるので、完全
に溶融せず溶鋼と鋳型間の潤滑が不十分となり、鋳片表
面縦割れやシワキズが生じるほか、溶鋼流に巻き込まれ
て鋳片表層に非金属介在物が発生し品質低下をきたす、
これらの問題を解決するため、従来技術として次のよう
なものが公知となっている。In addition, if high viscosity powder of 2 poise or more is added at the early stage of casting, the molten steel will cool rapidly and will not melt completely, resulting in insufficient lubrication between the molten steel and the mold, resulting in vertical cracks and wrinkles on the surface of the slab. In addition to this, non-metallic inclusions are generated on the surface layer of the slab by being caught up in the molten steel flow, resulting in quality deterioration.
In order to solve these problems, the following conventional techniques are known.
特公昭59−37711号には浸漬ノズルを挾んで、そ
れぞれ狭面壁方向に対応して設けたジャマ板で溶鋼吐出
流をコントロールし、パウダーの巻き込みを防止する方
法が提示されているが、これはあくまでも浸漬ノズルか
らの吐出流をコントロールするのが主たる目的である。Japanese Patent Publication No. 59-37711 proposes a method for controlling the flow of molten steel with a jammer plate installed in the direction of the narrow wall between the immersion nozzles and preventing powder from being entrained. The main purpose is to control the discharge flow from the immersion nozzle.
また、特開昭80−221156号では鋳型面板に分散
開口する細孔をあけ、この細孔を通して潤滑剤を面板と
鋳片シェル間に直接供給することにより、鋳型内鋳片の
潤滑改善を図り、優れた表面品質の鋳片を得る方法を提
示している。Furthermore, in JP-A No. 80-221156, the lubrication of the slab in the mold is improved by opening distributed pores in the mold face plate and supplying lubricant directly between the face plate and the slab shell through these pores. , presents a method to obtain slabs with excellent surface quality.
発明が解決しようとする問題点
前述のごとく、モールド用パウダーの要求特性に対して
、溶鋼と鋳型間の潤滑性からみると2〜3poise程
度の高粘性パウダーが最良であるが、パウダーの介在物
吸収機能としては0.5〜1.5poise程度の低粘
性パウダーが望まれている。このように相反するパウダ
ー特性が要求されるが、現状では同一種類のパウダーで
これらの相反する要求特性を適当にバランスさせてそれ
に合った特性を持つ銘柄を選定し使用しているのが実態
である。Problems to be Solved by the Invention As mentioned above, in terms of the required characteristics of powder for molding, a powder with a high viscosity of about 2 to 3 poise is best in terms of lubricity between the molten steel and the mold, but powder inclusions A powder with a low viscosity of about 0.5 to 1.5 poise is desired for its absorption function. Although conflicting powder properties are required in this way, the current situation is to appropriately balance these conflicting required properties using the same type of powder, and then select and use a brand with the properties that match it. be.
問題点を解決するための手段
本発明者は潤滑用パウダーと介在物吸収用パウダーを併
用し、パウダー特性を有効に機能させる方法を発明した
。すなわち、モールド内の浸漬ノズルと鋳型壁間に仕切
板を設置し、仕切壁内側には0.5〜1.5poise
程度の低粘性パウダーを供給することによって、主にM
、03系介在物を吸収せしめ、同時に仕切板外側には2
〜3polse程度の高粘性パウダーを適量づつ供給し
て溶鋼と鋳型間の潤滑性を向上せしめて拘束性のブレー
クアウトや鋳片縦割れあるいはシワ、キズの防止を図る
ものである。Means for Solving the Problems The present inventor has invented a method of using a lubricating powder and an inclusion absorbing powder in combination to make the powder characteristics function effectively. That is, a partition plate is installed between the immersion nozzle in the mold and the mold wall, and the inside of the partition wall has a pressure of 0.5 to 1.5 poise.
Mainly by supplying low viscosity powder of
, 03 system inclusions are absorbed, and at the same time, 2
Appropriate amounts of high viscosity powder of about ~3 polse are supplied at a time to improve the lubricity between the molten steel and the mold, thereby preventing restraint breakout, longitudinal cracking of the slab, wrinkles, and scratches.
次に本発明のパウダー投入方法について、第1図に基づ
いて説明する。第1図のタンディツシュ内溶鋼は、浸漬
ノズル1を通って、ノズルストッパーにより流量をコン
トロールされながら、モールド3に鋳造されるが、その
際モールド内浸漬ノズルlと鋳型3間に仕切板4を設け
、その内側に介在物除去の良好な低粘性パウダー5を投
入し、外側には溶鋼と鋳型壁間の潤滑性向上せしめるた
めの高粘性パウダー6を同時に投入しながら連続鋳造を
行なう。Next, the powder charging method of the present invention will be explained based on FIG. 1. The molten steel in the tundish shown in Fig. 1 passes through the immersion nozzle 1 and is cast into the mold 3 while the flow rate is controlled by the nozzle stopper. At this time, a partition plate 4 is provided between the immersion nozzle 1 in the mold and the mold 3. Continuous casting is carried out while simultaneously charging a low-viscosity powder 5, which is good at removing inclusions, into the inside, and a high-viscosity powder 6, which improves the lubricity between the molten steel and the mold wall, to the outside.
かくすることにより仕切板内側では介在物を十分吸収す
るだけのパウダー粘性が得られ、かつ仕切板外側では溶
鋼と鋳片間への適正なパウダー厚が保証され、均一な流
入が生じ、潤滑のための良好なスラグフィルム7が形成
される。As a result, powder viscosity sufficient to absorb inclusions can be obtained on the inside of the partition plate, and an appropriate thickness of powder between the molten steel and the slab is ensured on the outside of the partition plate, resulting in uniform inflow and improved lubrication. A good slag film 7 is formed.
実施例 以下に実施例について説明する。Example Examples will be described below.
(1)前提条件
(1)鋼 種; 5WRH72A
(2)溶鋼温度: 1B00℃
(3)最大溶鋼処理11 ; 180ton(2)設備
仕様
(1)連鋳機;垂直型
(2)タンディツシュ;12E
(3)モールド形状; 400mmX25Os層角(
4)仕切板形状; 270m腸×180■膳角(3)
使用パウダー
第1表に本発明に係る使用パウダーの種類を示した。(1) Prerequisites (1) Steel type; 5WRH72A (2) Molten steel temperature: 1B00℃ (3) Maximum molten steel processing 11; 180 tons (2) Equipment specifications (1) Continuous casting machine; vertical type (2) Tundish; 12E ( 3) Mold shape; 400mm x 25Os layer angle (
4) Partition plate shape: 270m x 180mm square (3)
Table 1 shows the types of powders used in the present invention.
(4)結果
モールド内に仕切板を設置した後、その内側にAll
20.系介在物吸着性の良い0.7poiseの低粘性
パウダーを投入し、同時に仕切板外側には潤滑性を考慮
した2poiseの高粘性パウダーを併用した本発明の
方法で製造した鋳片と、従来法で製造した鋳片の表面品
質と内質清浄性を比較した。また、ブレークアウトの発
生状況についても対比した。(4) As a result, after installing the partition plate inside the mold,
20. A cast slab produced by the method of the present invention in which 0.7 poise low viscosity powder with good adsorption properties for system inclusions is added and at the same time 2 poise high viscosity powder considering lubricity is added to the outside of the partition plate and the conventional method. We compared the surface quality and internal cleanliness of the slabs produced in the following manner. We also compared the occurrence of breakouts.
まず表面品質についてみると、第2表に示すように、本
発明の方が鋳片表面の縦ワレは認められないのに対して
、従来法では一部タンディッシュ内溶鋼温度の高いもの
で縦割れが認められている。First, looking at the surface quality, as shown in Table 2, in the method of the present invention, vertical cracks on the surface of the slab are not observed, whereas in the conventional method, the molten steel temperature in the tundish is high. Cracks are observed.
また、ブレークアウトの発生も本発明では皆無であった
のに対して、従来法では一部発生していた。Further, breakout did not occur at all in the present invention, whereas breakout occurred in some cases in the conventional method.
次に、本発明と従来法で製造した鋳片の内質清浄をAt
、03系の介在物指数で比較した。ここで介在物指数
とはAll、03系介在物の長径側の平均長さをTot
al したちので、第2図、第2表のように本発明によ
る介在物指数は従来法の鋳片に比べて著るしく小さくな
っており高清浄化が図られていた。Next, the internal quality of the slabs manufactured by the present invention and the conventional method was cleaned using At
, 03 series inclusion index was compared. Here, the inclusion index is the average length on the major axis side of All, 03 type inclusions.
Therefore, as shown in FIG. 2 and Table 2, the inclusion index of the present invention was significantly smaller than that of the conventional slab, and a high level of cleanliness was achieved.
(以下余白)
発明の効果
本発明によれば、連続鋳造において鋳片の高清浄化が達
成でき、ブレークアウトなどの操作トラブルも低減でき
る0本発明は比較的安価な’J、Mで実施できるので工
業的価値は非常に高い。(Left below) Effects of the Invention According to the present invention, high cleanliness of slabs can be achieved in continuous casting, and operational troubles such as breakouts can be reduced. The industrial value is very high.
第1図は1本発明に係るパウダー投入装置の断面図であ
り、第1図(1)は立面図、第1図(2)は平面図であ
る。第2図は実施例での試験結果を示す図である。
l・・・浸漬ノズル、3・・・水冷鋳型(モールド)。
4・・・仕切板、5・・・低粘性パウダー、6・・・高
粘性パウダー、7・・・スラグ°、フイルハ、9・・・
スラグ暦、lO・・・凝固シェル、11・・・溶鋼、
12・・・スラグベア(ヒモ)。
代理人 弁理士 井 上 雅 生
第 1 図FIG. 1 is a sectional view of a powder charging device according to the present invention, FIG. 1 (1) is an elevation view, and FIG. 1 (2) is a plan view. FIG. 2 is a diagram showing test results in Examples. l... Immersion nozzle, 3... Water-cooled mold (mold). 4... Partition plate, 5... Low viscosity powder, 6... High viscosity powder, 7... Slag°, film, 9...
Slag calendar, lO... solidified shell, 11... molten steel,
12...Slugbear (string). Agent Patent Attorney Masaru Inoue
Claims (1)
ルと鋳型壁間に仕切板を設置し、その仕切板内側に介在
物吸着性の良い低粘性パウダーを投入し、同時に仕切板
外側の溶鋼と鋳型壁間には潤滑性に優れた高粘性パウダ
ーを供給しながら連続鋳造を行なうことを特徴とする連
続鋳造法。In the continuous casting method for molten metal, a partition plate is installed between the immersion nozzle in the mold and the mold wall, and a low-viscosity powder with good inclusion adsorption properties is injected into the inside of the partition plate, and at the same time, the molten steel outside the partition plate and the mold are injected. A continuous casting method that is characterized by continuous casting while supplying highly viscous powder with excellent lubricity between the walls.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1823587A JPS63188462A (en) | 1987-01-30 | 1987-01-30 | Continuous casting method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1823587A JPS63188462A (en) | 1987-01-30 | 1987-01-30 | Continuous casting method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63188462A true JPS63188462A (en) | 1988-08-04 |
Family
ID=11966008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1823587A Pending JPS63188462A (en) | 1987-01-30 | 1987-01-30 | Continuous casting method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63188462A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5299627A (en) * | 1992-03-03 | 1994-04-05 | Kawasaki Steel Corporation | Continuous casting method |
-
1987
- 1987-01-30 JP JP1823587A patent/JPS63188462A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5299627A (en) * | 1992-03-03 | 1994-04-05 | Kawasaki Steel Corporation | Continuous casting method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2825947A (en) | Method of continuous casting of metal | |
US3318363A (en) | Continuous casting method with degassed glass-like blanket | |
KR20100011684A (en) | Submerged nozzle for tundish | |
JP4337565B2 (en) | Steel slab continuous casting method | |
JPS63188462A (en) | Continuous casting method | |
JP2007175769A (en) | Continuous casting method | |
JPS58188544A (en) | Continuous casting device of metallic plate | |
JPH0199761A (en) | Method for continuously casting aluminum killed steel | |
JP2020168644A (en) | Method for producing thin slab | |
JP3500894B2 (en) | Continuous casting of steel | |
JP3546137B2 (en) | Steel continuous casting method | |
JP3610871B2 (en) | Continuous casting method of steel | |
JP3532097B2 (en) | Manufacturing method of continuous cast slab with excellent cleanliness | |
JPH0446657A (en) | Method for casting steel having excellent hydrogen induced cracking resistance | |
JPH01266950A (en) | Continuous casting method | |
SU660776A1 (en) | Method of making castings | |
JPH09192786A (en) | Mold for continuously casting steel and continuous casting method | |
KR20110131356A (en) | Continuous casting method using powder | |
JPH06226403A (en) | Method for continuously casting low aluminum steel | |
JP2004098127A (en) | Method for continuously casting high quality stainless steel cast slab | |
JP2005211924A (en) | Method for continuously casting steel | |
KR19990050955A (en) | Zirconia-containing mold flux for continuous casting of medium carbon steel | |
KR101344902B1 (en) | Control method for quality of steel | |
NEMOTO | Development of Continuous Casting Operation | |
JPS61115653A (en) | Continuous casting method of medium-carbon steel |