JPH11277199A - Method for continuously casting steel - Google Patents
Method for continuously casting steelInfo
- Publication number
- JPH11277199A JPH11277199A JP7949498A JP7949498A JPH11277199A JP H11277199 A JPH11277199 A JP H11277199A JP 7949498 A JP7949498 A JP 7949498A JP 7949498 A JP7949498 A JP 7949498A JP H11277199 A JPH11277199 A JP H11277199A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- powder
- slab
- casting
- gas
- 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.)
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- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋼の連続鋳造方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously casting steel.
【０００２】[0002]
【従来の技術】連続鋳造においては、鋳造終了後の引き
抜き時に鋳片尾端部（一般に鋳片トップという）からの
吹き出しや絞り出し等による溶鋼の流出が生じる場合が
ある。従来溶鋼の吹き出しは、鋳片の凝固促進のための
スプレー水が鋳片トップの溶鋼中に侵入した際の水蒸気
爆発などが原因になっていた。また、連続鋳造機のロー
ルからの鋳片の押し付けにより未凝固の溶鋼が絞り出さ
れる場合や、鋳片トップが連鋳機の湾曲部から水平部に
移行していく際に鋳片トップから未凝固溶鋼が垂れ出る
ことも溶鋼流出の原因とされてきた。2. Description of the Related Art In continuous casting, molten steel may flow out from a tail end of a slab (generally referred to as a slab top) at the time of drawing after completion of casting due to blowing or squeezing. Conventionally, the blowing of molten steel has been caused by steam explosion when spray water for accelerating solidification of the slab enters the molten steel at the top of the slab. In addition, when unsolidified molten steel is squeezed out by pressing the slab from the roll of the continuous casting machine, or when the slab top moves from the curved portion to the horizontal portion of the continuous casting machine, The dripping of solidified molten steel has also been attributed to the outflow of molten steel.
【０００３】このような鋳片トップからの溶鋼流出が発
生した場合には、機内に残留した地金の処理のために次
回の鋳造開始までの準備時間延長につながり生産性を著
しく損ねたり、連鋳機のロール等の設備破損に至るとい
った問題がある。[0003] When the molten steel flows out of the slab top, the preparation time until the next start of casting is prolonged due to the processing of the metal remaining in the machine, and the productivity is remarkably impaired. There is a problem that equipment such as a roll of a casting machine is damaged.
【０００４】この問題に対して、例えば鉄板を挿入し鋳
片トップの未凝固表面に凝固層を形成させて溶鋼の流出
を防止する方法が特開昭５９−７６６５２号公報に開示
されている。また、鋳造終了時に鋳片トップに赤熱した
耐火物を挿入し、凝固シェル上端と未凝固湯面の距離を
所定量確保することで、スプレー水の侵入を防止する方
法が特開平９−１０８９９号公報に示されている。しか
しながら、これらの技術はメタラジカルレングスが１５
ｍを超える場合であり、メタラジカルレングスが１５ｍ
以下の条件で鋳造を行う場合には鋳片トップからの溶鋼
流出が完全には防止出来ていなかった。To solve this problem, Japanese Unexamined Patent Publication (Kokai) No. 59-76652 discloses a method for preventing molten steel from flowing out by, for example, inserting an iron plate to form a solidified layer on an unsolidified surface of a slab top. Japanese Patent Application Laid-Open No. Hei 9-10899 discloses a method for preventing spray water from entering by inserting a red-hot refractory into a slab top at the end of casting and securing a predetermined distance between the upper end of a solidified shell and an unsolidified molten metal surface. It is indicated in the gazette. However, these techniques have a metaradical length of 15
m, the meta-radical length is 15 m
When casting was performed under the following conditions, the outflow of molten steel from the slab top was not completely prevented.
【０００５】連続鋳造においては周知のごとく、鋳型と
鋳片間の潤滑、溶鋼表面の断気・保温、非金属介在物の
吸収と系外への排出等の目的からパウダーを使用するこ
とが一般的である。連続鋳造用パウダーはCaO 、Al
2O3 、SiO2、Na2O、Ｆ等の成分から構成されており、鋳
型内の溶鋼湯面上に溶融層を形成するような成分組成と
することで、鋳型と鋳片間へ潤滑材として流入したり、
非金属介在物を吸収する機能が付与されている。[0005] As is well known in continuous casting, it is common to use powder for the purpose of lubrication between a mold and a slab, deaeration and heat insulation of molten steel surface, absorption of nonmetallic inclusions, and discharge to the outside of the system. It is a target. Powder for continuous casting is CaO, Al
It is composed of components such as 2 O 3 , SiO 2 , Na 2 O, and F, and has a component composition that forms a molten layer on the surface of molten steel in the mold, thereby lubricating between the mold and the slab. Inflow as material,
A function of absorbing nonmetallic inclusions is provided.
【０００６】溶鋼−パウダー界面における溶鋼成分と溶
融パウダー中の成分との反応の一つとして、溶鋼中のＣ
とパウダー中のSiO2の反応があり、COガスを発生する。
通常、キルド鋼においては発生するCOガスの量が操業や
品質を害する程の量ではなく、また、ガスがパウダーを
介して系外に抜けていくために鋳造中には問題にならな
い。One of the reactions between the molten steel component at the molten steel-powder interface and the component in the molten powder is as follows.
And the reaction of SiO 2 in the powder produces CO gas.
Normally, in the case of killed steel, the amount of generated CO gas is not an amount that impairs the operation and quality, and the gas flows out of the system via powder, so that there is no problem during casting.
【０００７】しかしながら、鋳造終了後の引き抜き中に
おいては、パウダー溶融層が温度の低下とともに上部か
ら凝固して発生するガスの抜け性が低下し、次第にガス
が鋳片内に蓄積されていく。鋳片内のガス圧がある程度
高くなるとパウダーの凝固層もしくは半凝固層を破って
ガスが溶鋼を伴って流出する場合があり、この現象はメ
タラジカルレングスが１５ｍ以下の場合に特に発生し易
いことを本発明者らは新たに見出した。However, during the drawing after the casting is completed, the powder melted layer solidifies from the upper part as the temperature decreases, and the gas generated from the solidified layer deteriorates, and the gas gradually accumulates in the slab. If the gas pressure in the slab becomes high to some extent, the gas may break through the solidified or semi-solidified layer of the powder and flow out with the molten steel. This phenomenon is particularly likely to occur when the metaradical length is 15 m or less. The present inventors have newly found.
【０００８】[0008]
【発明の解決しようとする課題】本発明は、前述の水蒸
気爆発やロール押し付け等の原因による溶鋼流出ではな
く、COガスが原因となる鋳片トップからの溶鋼流出を防
止するためのパウダー使用条件を提供することを目的と
する。SUMMARY OF THE INVENTION The present invention is directed to a use condition of powder for preventing molten steel from flowing out of a slab top caused by CO gas, but not from molten steel caused by steam explosion or roll pressing described above. The purpose is to provide.
【０００９】[0009]
【課題を解決するための手段】本発明の特徴とするとこ
ろは、鋼の連続鋳造において、１２００℃における液相
率が２０％以下となる性質を有するパウダーを用いるこ
とである。A feature of the present invention is to use a powder having a property that a liquid phase ratio at 1200 ° C. is 20% or less in continuous casting of steel.
【００１０】[0010]
【発明の実施の形態】図１に示すように、連続鋳造にお
いては、鋳型１、１a により溶鋼を冷却し外周に凝固層
２、その内側に未凝固溶鋼層３からなる鋳片を連続的に
引き抜き、次いでスプレー冷却水にて凝固を促進・完了
させるものである。鋳型１、１a と鋳片の間の潤滑、未
凝固溶鋼層３の断気・保温、非金属介在物の吸収と系外
への排出等の目的から連続鋳造においてはパウダーを使
用することが一般的であり、鋳型内で未溶融層４及び溶
融パウダー層５を形成する。溶鋼成分であるＣと溶融パ
ウダー成分であるSiO2は次式に示す反応によりCOガスを
発生する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, in continuous casting, molten steel is cooled by molds 1 and 1a, and a slab consisting of a solidified layer 2 on the outer periphery and an unsolidified molten steel layer 3 on the inner side is continuously formed. The solidification is accelerated and completed by drawing and then spray cooling water. Generally, powder is used in continuous casting for the purpose of lubrication between the molds 1 and 1a and the slab, deaeration and heat insulation of the unsolidified molten steel layer 3, absorption of nonmetallic inclusions, and discharge to the outside of the system. The unmelted layer 4 and the molten powder layer 5 are formed in a mold. C, which is a molten steel component, and SiO 2, which is a molten powder component, generate CO gas by a reaction represented by the following equation.
【数１】２Ｃ＋(SiO2)→Ｓｉ＋２CO↑ 但し、 は溶鋼中の成分、( ) はパウダー中の成分であ
ることを表す。## EQU1 ## 2 C + (SiO 2 ) → Si + 2CO ↑ Indicates a component in molten steel, and () indicates a component in powder.
【００１１】しかして、前記のごとく、鋳造終了後の引
き抜き中においては、パウダー溶融層が温度の低下とと
もに上部から凝固していき、発生するガスの抜け性が低
下し次第にガスが鋳片内に蓄積されていく。鋳片内のガ
ス圧がある程度高くなるとパウダーの凝固層もしくは半
凝固層を破ってガスが溶鋼を伴って流出する場合がある
ことを本発明者らは見出した。However, as described above, during drawing after the end of casting, the powder melted layer solidifies from the upper part as the temperature decreases, and the gas generated gradually decreases in the slab as the gas release property decreases. It accumulates. The present inventors have found that when the gas pressure in the slab increases to some extent, the gas may break through the solidified layer or semi-solidified layer of the powder and flow out with the molten steel.
【００１２】かくして、SiO2を含有しないパウダーを使
用すれば数１の反応を防止することが可能であるが、パ
ウダーとしての溶融特性を満足するためにはSiO2を含有
させるのが重要である。そこで、パウダー溶融層から溶
鋼側へのSiO2の供給を抑制することで数１によるCOガス
発生量を鋳片トップからの溶鋼流出が生じない程度に低
減することが望ましい。すなわち、温度低下に伴いパウ
ダー溶融層はしだいに固液共存相、固相に変化していく
が、引き抜き時におけるパウダーの液相率が低いほど、
溶鋼側へのSiO2の供給を抑制でき、鋳片トップからの溶
鋼流出の防止に有利である。Thus, the use of a powder containing no SiO 2 makes it possible to prevent the reaction of the formula (1), but it is important to contain SiO 2 in order to satisfy the melting characteristics of the powder. . Therefore, it is desirable to suppress the supply of SiO 2 from the powder molten layer to the molten steel side to reduce the amount of CO gas generated by Equation 1 to such an extent that molten steel does not flow out of the slab top. That is, the powder molten layer gradually changes to a solid-liquid coexisting phase and a solid phase with a decrease in temperature, but as the liquid phase ratio of the powder at the time of drawing is lower,
The supply of SiO 2 to the molten steel side can be suppressed, which is advantageous for preventing the molten steel from flowing out of the slab top.
【００１３】まず、本発明者らは実験において坩堝中で
溶解した溶鋼上に表１に挙げたパウダーを乗せた後放冷
し、発生するＣＯガス量を調査した。その結果、図２に
示すごとく１２００℃におけるパウダーの液相率が小さ
いほど発生したＣＯガス量が少ない。特に液相率が２０
％以下であればＣＯガスの発生量が少なく溶鋼流出の抑
制に有利であることを見出し、本発明法を完成した。First, the present inventors placed powders listed in Table 1 on molten steel melted in a crucible in an experiment and allowed them to cool, and examined the amount of generated CO gas. As a result, as shown in FIG. 2, the smaller the liquid phase ratio of the powder at 1200 ° C., the smaller the amount of generated CO gas. In particular, the liquid phase ratio is 20
% Or less, it was found that the amount of generated CO gas was small, which was advantageous for suppressing the outflow of molten steel. Thus, the method of the present invention was completed.
【００１４】なお、パウダーの液相率の算出方法として
は、例えば4th International Conference on Molten S
lags,p103-108,(1992),Sendai,ISIJにより晶出相の平衡
計算を行う方法や所定の高温で一定時間保持したあと急
冷して組織観察から液相率を求める実験方法等が挙げら
れる。また、1100〜1300℃程度の範囲においては、一般
的にパウダーの液相率が大きく変化しないことから、12
00℃における液相率を代表的な指標と扱うことが出来
る。As a method for calculating the liquid phase ratio of the powder, for example, 4th International Conference on Molten S
lags, p103-108, (1992), Sendai, ISIJ, a method of calculating the equilibrium of the crystallized phase, and an experimental method of obtaining the liquid phase ratio from the microstructure observation by quenching after holding at a predetermined high temperature for a certain period of time, etc. . Further, in the range of about 1100 to 1300 ° C., since the liquid phase ratio of the powder generally does not largely change,
The liquid phase ratio at 00 ° C. can be treated as a representative index.
【００１５】[0015]
【表１】 [Table 1]
【００１６】また、引き抜き時には鋳片内部の凝固に伴
う体積収縮により、未凝固の溶鋼湯面が下がっていき、
最終的に凝固完了時に凝固した湯面は鋳片トップからあ
る程度の距離を有する（以下、この距離を湯引き量とい
う）。メタラジカルレングスが短いほど鋳造終了時の鋳
片内の溶鋼未凝固長さが短いため、引き抜き中の凝固に
伴う体積収縮量が小さい。このため、メタラジカルレン
グスの短い連鋳機ほど湯引き量が小さく、溶鋼の吹き出
しが生じた時に溶鋼流出が発生し易くなる。特にメタラ
ジカルレングスが１５ｍ以下の連続鋳造機においてはCO
ガスに起因する溶鋼流出頻度が高くなり、本発明の効果
が期待できる。At the time of drawing, the unsolidified molten steel surface goes down due to volume shrinkage accompanying solidification inside the slab.
Finally, when the solidification is completed, the solidified surface has a certain distance from the slab top (hereinafter, this distance is referred to as the amount of hot water). The shorter the meta-radical length, the shorter the unsolidified length of molten steel in the slab at the end of casting, so the smaller the volume shrinkage due to solidification during drawing. For this reason, the continuous caster having a shorter metaradical length has a smaller amount of hot water, and the molten steel is more likely to flow out when the molten steel is blown out. Especially in a continuous casting machine with a metaradical length of 15 m or less, CO
The outflow frequency of molten steel caused by the gas increases, and the effect of the present invention can be expected.
【００１７】[0017]
【実施例】厚み２５０ｍｍで巾１０００〜２０００ｍｍ
の炭素鋼の鋳片をメタラジカルレングスの異なる連続鋳
造機で鋳造した後の引き抜き時において、ＣＯガスに起
因する鋳片トップからの溶鋼流出発生頻度の調査を行っ
た。９、１５、２６、４８ｍのメタラジカルレングス
で、それぞれ0.42、0.70、1.20、2.25 m/minの速度で引
き抜きを行い、引き抜き回数に対する溶鋼流出の発生頻
度を指数化した。その結果、図３に示す如く１２００℃
におけるパウダーの液相率が小さいほど少なく、液相率
が２０％以下で溶鋼流出を低減できることが明らかにな
った。[Example] 250 mm thick and 1000 to 2000 mm wide
The frequency of molten steel flowing out from the top of the slab due to CO gas was investigated when the carbon steel slab was drawn using a continuous caster having a different metaradical length. Drawing was performed at a speed of 0.42, 0.70, 1.20, and 2.25 m / min with meta-radical lengths of 9, 15, 26, and 48 m, respectively, and the occurrence frequency of molten steel outflow with respect to the number of times of drawing was indexed. As a result, as shown in FIG.
It was clarified that the smaller the liquid phase ratio of the powder was, the smaller the powder phase ratio was.
【００１８】またメタラジカルレングスの違いに着目し
た場合、メタラジカルレングスが短いほど溶鋼流出の発
生頻度が高く、特にメタラジカルレングスが15ｍ以下の
場合にその発生頻度が大きくなっており、本発明法であ
る1200℃における液相率が20％以下のパウダーを使用
し、引き抜き時の鋳片トップからの溶鋼流出を防止する
ことが望ましい。When attention is paid to the difference in the metaradical length, the shorter the metaradical length, the higher the frequency of molten steel outflow, especially when the metaradical length is 15 m or less. It is desirable to use a powder having a liquidus ratio at 1200 ° C. of 20% or less to prevent molten steel from flowing out of the slab top during drawing.
【００１９】[0019]
【本発明の効果】本発明によれば、引き抜き時のＣＯガ
スの発生量を抑制すると同時に湯引き量をより大きく確
保することができるため、鋳片トップからの溶鋼流出を
防止でき、鋳造準備時間の延長や設備破損等の防止効果
が得られる。According to the present invention, the amount of CO gas generated at the time of drawing can be suppressed, and at the same time, the amount of molten metal can be increased, so that the molten steel can be prevented from flowing out of the slab top, and the casting preparation time can be reduced. And the effect of preventing equipment damage and the like can be obtained.
【図１】連続鋳造鋳型における鋳造方法を示す縦断面図
である。FIG. 1 is a longitudinal sectional view showing a casting method in a continuous casting mold.
【図２】実験により求めたパウダーの液相率とＣＯガス
の発生量の関係を表す図面である。FIG. 2 is a diagram showing a relationship between a liquid phase ratio of powder and an amount of generated CO gas obtained by an experiment.
【図３】実連鋳機でのパウダー液相率と溶鋼流出頻度の
関係を表す図面である。FIG. 3 is a drawing showing a relationship between a powder liquid phase ratio and a molten steel outflow frequency in an actual continuous casting machine.
１ 連続鋳造鋳型 ２ 凝固シェル ３ 未凝固溶鋼 ４ パウダー ５ 溶融パウダー層 Reference Signs List 1 continuous casting mold 2 solidified shell 3 unsolidified molten steel 4 powder 5 molten powder layer
Claims (1)
固する位置までのメタラジカルレングスが１５ｍ以下の
条件にて鋳造を行なう連続鋳造機において、１２００℃
での液相率が２０％以下となる性質を有するパウダーを
用いることを特徴とする鋼の連続鋳造方法。1. A continuous casting machine which performs casting under the condition that a metaradical length from a molten steel meniscus in a mold to a position where a slab is completely solidified is 15 m or less, 1200 ° C.
A method for continuously casting steel, characterized by using a powder having a property that the liquid phase ratio at 20 ° C. is 20% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07949498A JP3546137B2 (en) | 1998-03-26 | 1998-03-26 | Steel continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07949498A JP3546137B2 (en) | 1998-03-26 | 1998-03-26 | Steel continuous casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11277199A true JPH11277199A (en) | 1999-10-12 |
| JP3546137B2 JP3546137B2 (en) | 2004-07-21 |
Family
ID=13691473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07949498A Expired - Fee Related JP3546137B2 (en) | 1998-03-26 | 1998-03-26 | Steel continuous casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3546137B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011016142A (en) * | 2009-07-08 | 2011-01-27 | Nippon Steel Corp | Bleed preventive method in continuous casting |
-
1998
- 1998-03-26 JP JP07949498A patent/JP3546137B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011016142A (en) * | 2009-07-08 | 2011-01-27 | Nippon Steel Corp | Bleed preventive method in continuous casting |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3546137B2 (en) | 2004-07-21 |
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