JPH03248747A - Method for continuously casting cast strip - Google Patents
Method for continuously casting cast stripInfo
- Publication number
- JPH03248747A JPH03248747A JP4099190A JP4099190A JPH03248747A JP H03248747 A JPH03248747 A JP H03248747A JP 4099190 A JP4099190 A JP 4099190A JP 4099190 A JP4099190 A JP 4099190A JP H03248747 A JPH03248747 A JP H03248747A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- scum
- temp
- cast strip
- cooling
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 title description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000002344 surface layer Substances 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims abstract 3
- 238000001556 precipitation Methods 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000002244 precipitate Substances 0.000 claims description 12
- 238000009749 continuous casting Methods 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000005336 cracking Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003746 surface roughness Effects 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〕
本発明は、ツインドラム方式のように、冷却ドラムの周
面の一部に湯溜り部を形成し、そこに注入した溶融金属
を冷却・凝固して、薄肉鋳片を製造する連続鋳造方法に
関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention, like the twin drum system, forms a pool on a part of the circumferential surface of the cooling drum, and cools and cools the molten metal poured into the pool. The present invention relates to a continuous casting method for manufacturing thin-walled slabs by solidification.
近来、溶銅等の熔融金属から直接最終形状に近い数閣〜
数十晒程度の肉厚をもつ薄肉鋳片を製造する方法が注目
されている。この連続鋳造法によるとき、従来のような
多段階にわたる熱延工程を必要とせず、また最終形状に
するための圧延も軽度なもので済むため、工程及び設備
の簡略化を図ることができる。In recent years, molten metals such as molten copper have been made directly into shapes that are close to the final shape.
A method of manufacturing thin-walled slabs with a wall thickness of several tens of millimeters is attracting attention. When this continuous casting method is used, a multi-step hot rolling process as in the conventional method is not required, and only a light rolling process is required to obtain the final shape, so that the process and equipment can be simplified.
この種の連続鋳造法として、互いに逆方向に回転する一
対の冷却ドラムの間に湯溜り部を形成するツインドラム
方式、冷却ドラムとベルトとの間に湯溜り部を形成する
ドラム−ヘルド方式、−木の冷却ドラムの周面一部に湯
溜り部を形成する単ドラム方式等がある。これらの方式
においては、いずれも冷却ドラムの周面に接する部分で
、溶融金属の冷却・凝固が進行し、凝固シェルを生成す
る。従って、この凝固シェルを安定して成長せしめるこ
とが良好な表面性状を有する薄肉鋳片を得るために極め
て重要である。This type of continuous casting method includes a twin-drum method in which a pool is formed between a pair of cooling drums rotating in opposite directions, a drum-held method in which a pool is formed between a cooling drum and a belt, - There is a single drum system in which a hot water reservoir is formed on a part of the circumference of a wooden cooling drum. In all of these methods, cooling and solidification of the molten metal proceed at the portion in contact with the circumferential surface of the cooling drum, producing a solidified shell. Therefore, it is extremely important to stably grow this solidified shell in order to obtain a thin slab with good surface properties.
しかし、か−る鋳造を行うに際し、湯溜り部に注入され
た溶融金属（溶湯）の表層に浮遊する酸化物（スカム）
が、冷却ドラムの回転と共に流動する溶湯に付随して生
成中の凝固シェルに巻き込まれる場合があり、この結果
、鋳造された薄肉鋳片に肌荒れや割れ等の欠陥が発生す
る。However, when performing such casting, oxides (scum) floating on the surface layer of the molten metal poured into the sump.
However, as the cooling drum rotates, the molten metal flows and may get caught up in the solidified shell that is being formed. As a result, defects such as surface roughness and cracks occur in the cast thin slab.
この問題を解消するために、湯溜り部を非酸化性雰囲気
としてスカム発生を抑制する技術が提案されている（特
開昭６２−１３０７４９号公報参照）。In order to solve this problem, a technique has been proposed in which the scum is made into a non-oxidizing atmosphere to suppress the generation of scum (see Japanese Patent Laid-Open No. 130749/1983).
しかしながら、湯溜り部を非酸化性雰囲気にしても冷却
ドラムの隙間より該冷却ドラムの回転に伴って外気が引
き込まれたり、また、溶湯の種類や清浄度によって溶湯
から不純物が浮上する場合があり、スカム生成を完全に
防止することは困難である。However, even if the molten metal pool is made into a non-oxidizing atmosphere, outside air may be drawn in through the gaps in the cooling drum as the cooling drum rotates, and impurities may float from the molten metal depending on the type and cleanliness of the molten metal. , it is difficult to completely prevent scum formation.
そこで本発明は湯溜り部内の湯面上に生成するスカムの
組成を改善することにより、スカムに起因する鋳片欠陥
の発生を防止して表面割れの少ない優れた品質の薄鋳片
を製造するものである。Therefore, the present invention improves the composition of the scum that forms on the surface of the molten metal in the sump, thereby preventing the occurrence of slab defects caused by scum and producing thin slabs of excellent quality with fewer surface cracks. It is something.
（課題を解決するための手段〕
本発明の薄肉鋳片の連続鋳造方法は、前記目的を達成す
るために、不活性雰囲気中で冷却ドラム周面により溶湯
を象、冷・凝固するに際し、溶湯表面に浮遊するスカム
のうち、温度降下時に最初に析出する酸化物組成の析出
温度を該溶融金属の液相線温度以下に調整することを特
徴とする。この調整を溶湯中の溶存酸素濃度と不活性雰
囲気中の酸素濃度の関係において行うものである。(Means for Solving the Problems) In order to achieve the above-mentioned object, the continuous casting method for thin-walled slabs of the present invention has the following advantages: When molten metal is blown, cooled and solidified by the circumferential surface of a cooling drum in an inert atmosphere, the molten metal is Among the scum floating on the surface, the precipitation temperature of the oxide composition that first precipitates when the temperature drops is adjusted to below the liquidus temperature of the molten metal.This adjustment is made by adjusting the dissolved oxygen concentration in the molten metal. This is done in relation to the oxygen concentration in the inert atmosphere.
本発明は、湯溜り部内の場面に浮遊するスカムのうち、
温度降下時に最初に析出する酸化物組成の析出温度を該
熔融金属の液相線温度以下に調整するとスカムが凝固シ
ェルに巻込まれても、鋳片表面に割れを発生しないとい
う新しい知見に基づいて成されたものである。The present invention removes scum floating in the hot water basin.
Based on the new knowledge that if the precipitation temperature of the oxide composition that first precipitates when the temperature drops is adjusted to below the liquidus temperature of the molten metal, cracks will not occur on the surface of the slab even if the scum is caught in the solidified shell. It has been accomplished.
以下、本発明の詳細な説明する。先ず、鋳造中に採取し
たスカムの組成中、温度降下の際、最初に析出した酸化
物相の析出温度と、このスカムが巻込まれて鋳造された
鋳片の緬割れ発生量との関係を第１図に示す。The present invention will be explained in detail below. First, we investigated the relationship between the precipitation temperature of the oxide phase that first precipitates when the temperature drops in the composition of scum collected during casting, and the amount of cracks that occur in slabs that are cast with this scum involved. Shown in Figure 1.
第１図はステンレス鋼の内、第１表に示す成分を有する
Ｃｒ Ｎｉ系ステンレス鋼を試験材に選択し、第３図
に示す冷却ドラム２ａ 、２ｂを備えた連続鋳造装置に
より薄鋳片８を製造したときに、上記装置における湯溜
り部４の閉鎖空間６内の雰囲気酸素濃度を種々変化させ
、その際に前記湯溜り部４の場面に浮遊しているスカム
１１（スカム成分：ＳｉＯｚ−ＭｎＯ−Ａ ｌ ｚｏ３
−ＣａＯ−Ｃｒ２０３−ＦｅＯ）を採取して、温度降下
時に最初に析出するスカム中酸化物相の析出温度を求め
、鋳片に発生した縦割れ量との関係を示したものである
。なお、この析出温度は、多元系状態図から求めた。Fig. 1 shows a test material in which Cr-Ni stainless steel having the components shown in Table 1 is selected as the test material, and a thin cast piece 8 is produced using a continuous casting machine equipped with cooling drums 2a and 2b shown in Fig. When manufacturing the scum 11 (scum component: SiOz- MnO-A l zo3
-CaO-Cr203-FeO) was sampled to determine the precipitation temperature of the oxide phase in the scum that first precipitates when the temperature drops, and shows the relationship with the amount of vertical cracks that occurred in the slab. Note that this precipitation temperature was determined from a multicomponent phase diagram.
第１図によると、スカム中で、温度降下時に最初に析出
する酸化物相の析出温度がステンレス調の液相線（１４
５０°Ｃ）以下の場合に、鋳片の縦割れが発生しないこ
とがわかる。その理由は、酸化物相の析出温度が該溶融
金属の液相線以上であると、一部面体を含むスカムが巻
込まれ、この固体スカムが巻込まれた部分には凝固遅れ
が生じて、結局、ここが起点となって割れが生じる。一
方、完全に液体であるスカムが巻込まれても部分的な凝
固遅れ部の発生はな（、割れは生じないと考えられる。According to Figure 1, the precipitation temperature of the oxide phase that first precipitates when the temperature drops in the scum is the liquidus line of stainless steel (14
It can be seen that vertical cracking of the slab does not occur when the temperature is below 50°C. The reason for this is that when the precipitation temperature of the oxide phase is higher than the liquidus line of the molten metal, scum containing a partial hedron is involved, and solidification delays occur in the area where this solid scum is involved. , this is the starting point for cracking. On the other hand, even if completely liquid scum is involved, no partial solidification lags occur (and no cracks are considered to occur).
一方、溶鋼成分と鋳片割れ発生量の関係をみると、鋳片
割れ発生量は溶鋼の脱酸成分にも大きく影響される。す
なわち、５１−Ｍｎ系の脱酸成分の場合は、スカム成分
としてＳｉＯ□−ＭｎＯを主要成分とすることができる
ので鋳片割れを防止できる。これは、鋳片割れの発生率
がｍＷｆＡ中のＳｉ とＭｎの含有量の比（Ｓｉ／Ｍｎ
）によって規定されるためである。第２図はＳｉ及びＭ
ｎ以外の成分が第１表の化学成分よりなる溶鋼において
Ｓｔ とＭｎの濃度すなわち含有量の比（Ｓｉ／Ｍｎ）
を種々変化させ、該溶鋼湯溜り部の雰囲気中酸素濃度（
％）との関係を示したもので、斜線を施していないとこ
ろが鋳片割れの発生しない範囲（図中○印：割れなし、
×印：割れあり）である。図中、比Ｓｉ／Ｍｎの上限■
は、スカム成分中の高融点酸化物５ｉＯｚの析出によっ
て規制されており、この値は５ＵＳ３０４組成ではほぼ
１である。また、比Ｓｉ／Ｍｎの下限■は、スカム成分
中の高融点酸化物Ｃｒｚ０３の析出によって規制され、
この値は５Ｏ３３０４組成で０．０２である。On the other hand, looking at the relationship between the molten steel components and the amount of slab cracking, the amount of slab cracking is greatly influenced by the deoxidizing components of the molten steel. That is, in the case of a 51-Mn-based deoxidizing component, SiO□-MnO can be used as a main component as a scum component, so cracking of slabs can be prevented. This indicates that the incidence of slab cracking is the ratio of the Si and Mn contents in mWfA (Si/Mn
). Figure 2 shows Si and M
In molten steel whose components other than n are the chemical components listed in Table 1, the concentration or content ratio of St and Mn (Si/Mn)
The oxygen concentration in the atmosphere of the molten steel puddle (
%), the area without diagonal lines is the range where slab cracking does not occur (○ mark in the figure: no cracking,
× mark: cracks). In the figure, the upper limit of the ratio Si/Mn ■
is controlled by the precipitation of high melting point oxide 5iOz in the scum component, and this value is approximately 1 for the 5US304 composition. In addition, the lower limit (■) of the ratio Si/Mn is regulated by the precipitation of high melting point oxide Crz03 in the scum component,
This value is 0.02 for the 5O3304 composition.
一方、雰囲気中酸素濃度が上限■を超えるとＳｉＯ□が
析出する。この範囲は、比Ｓｉ／Ｍｎの値によって影響
される。その理由は次の通りである。すなわち、Ｓｉ濃
度が高いと、雰囲気中酸素濃度が低くてもＳｉは酸化さ
れやす（なり、５ｉＯ７が容易に析出するようになる。On the other hand, if the oxygen concentration in the atmosphere exceeds the upper limit ■, SiO□ will precipitate. This range is influenced by the value of the ratio Si/Mn. The reason is as follows. That is, when the Si concentration is high, Si is easily oxidized even if the oxygen concentration in the atmosphere is low (and 5iO7 is easily precipitated).
それに対して、Ｍｎ１度が高くなると、ｆ４鋼表面より
蒸発するＭｎ量が増加し、溶鋼と雰囲気ガスとの界面に
存在する酸素と反応する。それに伴って、界面酸素濃度
が雰囲気中の酸素濃度よりも実質的に低下し、ＳｉＯ□
の析出は抑えられる。そのため、雰囲気中酸素濃度の上
限を規定する境界線■は負の傾きとなる。なおここでは
、雰囲気中酸素濃度の下限■を工業的に制御可能な範囲
すなわちｌＸｌ０−”％とした。On the other hand, when the Mn1 degree increases, the amount of Mn evaporated from the f4 steel surface increases and reacts with oxygen present at the interface between the molten steel and the atmospheric gas. Along with this, the interfacial oxygen concentration is substantially lower than the oxygen concentration in the atmosphere, and the SiO□
The precipitation of can be suppressed. Therefore, the boundary line (■) that defines the upper limit of the oxygen concentration in the atmosphere has a negative slope. Here, the lower limit (2) of the oxygen concentration in the atmosphere was set to an industrially controllable range, that is, 1X10-''%.
以上のように、スカム中で最初に析出する酸化物組成の
析出温度（融点）を溶融金属すなわち溶鋼の液相線以下
とするためには、溶鋼成分の比Ｓｉ／Ｍｎを０．０２か
ら１．０の範囲とし、湯溜り部の雰囲気酸素濃度は上限
が１．０〜１．５％の範囲となるように維持しながら、
且つ第２図に示すように、比Ｓｉ／Ｍｎに応じて雰囲気
中の酸素濃度を調整する必要がある。As described above, in order to make the precipitation temperature (melting point) of the oxide composition that first precipitates in the scum below the liquidus line of the molten metal, that is, the molten steel, the ratio Si/Mn of the molten steel components must be adjusted from 0.02 to 1. .0, and while maintaining the atmospheric oxygen concentration in the hot water pool so that the upper limit is in the range of 1.0 to 1.5%,
Moreover, as shown in FIG. 2, it is necessary to adjust the oxygen concentration in the atmosphere according to the ratio Si/Mn.
また、主成分がＣａＯ−５ｉＯ□−ＡＩ、Ｏ□系の介在
物（編上スラグを巻込んだもの）が浮上し、スカムとい
っしょに巻込まれることもあるので、編上スラグの融点
も溶融金属（溶鋼）の液相線温度以下にするとともに、
ノズル耐火物等の高融点介在物を巻込ませないことも、
第２図に基づいて割れを抑える上での前提となる。In addition, inclusions whose main components are CaO-5iO -AI, O In addition to keeping the temperature below the liquidus line of metal (molten steel),
It also prevents high melting point inclusions such as nozzle refractories from getting involved.
This is the premise for suppressing cracks based on Figure 2.
以下、本発明を実施例に基づき説明する。The present invention will be explained below based on examples.
第１表の化学組成をもつＣｒ−Ｎｉ系ステンレス鋼の内
、Ｓｉ、Ｍｎをその比Ｓｉ／Ｍｎが第２表に示すイ直と
なるように変えてテストした。なお、ＭｎＯ値は、１．
００％〜１．２１％の範囲とした。Among the Cr--Ni stainless steels having the chemical compositions shown in Table 1, tests were conducted by changing Si and Mn so that the ratio Si/Mn was as shown in Table 2. Note that the MnO value is 1.
00% to 1.21%.
第２表
まず、第１表及び第２表に基づ（化学組成の１５００°
Ｃの溶鋼を第３図に示す湯溜り部４ヘタンデソシュ１よ
り注湯ノズル１１を介して注入した。冷却ドラム２ａ、
２ｂとサイド堰３で構成した湯溜り部４の上方に、密封
室５で覆われた閉鎖空間６が形成されているが、該閉鎖
空間６へ不活性ガスを注入して、該密封室５内の酸素濃
度を第２表に示すように調整した。Table 2 First, based on Tables 1 and 2 (chemical composition of 1500°
Molten steel C was injected into the molten metal sump 4 shown in FIG. 3 through the pouring nozzle 11. cooling drum 2a,
A closed space 6 covered with a sealed chamber 5 is formed above the pool 4 composed of the water pool 2b and the side weir 3.Inert gas is injected into the closed space 6 to close the sealed chamber 5. The oxygen concentration was adjusted as shown in Table 2.
その結果、第２表に示すように、スカム中で、降温時に
最初に析出する酸化物相の析出温度を調整しない従来例
に比較すると、本発明によれば、鋳片割れが著るしく減
少することが確認された。As a result, as shown in Table 2, according to the present invention, slab cracking is significantly reduced compared to the conventional example in which the precipitation temperature of the oxide phase that first precipitates during cooling in the scum is not adjusted. This was confirmed.
こ−で、第２表の０１印の欄はスカム中で曜温時に最初
に析出する酸化物相の析出温度を、■２印の欄は鋳片縮
開れ指数（ｍ ／ ｒｒ？）を表わす。Therefore, the column marked 01 in Table 2 indicates the precipitation temperature of the oxide phase that first precipitates in the scum at a normal temperature, and the column marked ■2 indicates the slab coagulation index (m/rr?). represent
なお、以上の説明においては、ツインドラム方式の連続
鋳造装置を使用した場合について説明したが、本発明は
これに拘束されるものではなく、また、Ｎｉ−Ｃｒ系ス
テンレス調以外のステンレス網にも勿論適用される。In addition, in the above explanation, the case where a twin-drum type continuous casting apparatus was used was explained, but the present invention is not limited to this, and also can be applied to stainless steel nets other than Ni-Cr stainless steel type. Of course it applies.
以上説明したように、本発明では、湯溜り部の上方空間
を不活性雰囲気にしてスカム量をできるだけ少なくする
とともに、該湯溜り部の場面に浮遊するスカムを融点の
低いスカムに調整するので、スカムが溶湯の流れに付随
して冷却ドラムに巻込まれても鋳片の縦割れが発生せず
、本発明により優れた薄肉鋳片を鋳造することができる
。As explained above, in the present invention, the space above the water pool is made into an inert atmosphere to reduce the amount of scum as much as possible, and the scum floating in the water pool is adjusted to scum with a low melting point. Even if the scum is caught in the cooling drum along with the flow of molten metal, vertical cracks in the slab do not occur, and the present invention makes it possible to cast excellent thin slabs.
第１図はスカム中で温度降下時に最初に析出する酸化物
相の析出温度と鋳片の縦割れ発生量（ｍ／ホ）の関係を
示す図であり、
第２図は湯溜り部雰囲気中の酸素濃度（％）と溶鋼中の
Ｓｉ／Ｍｎとの関係で、鋳片縦ｉｌｌれの発生しない領
域を示した図であり、
第３図はツインドラム方式の連続鋳造装置の概略を示す
断面側面図である。
１・・・タンプッシュ、 ２ａ 、２ｂ・・・冷却ド
ラム、３・・・サイド堰、 ４・・・湯溜り部、５
・・・密封室、 ６・・・閉鎖空間、７・・・溶
融金属、 ８・・・鋳片、９・・・ピンチロール
、
１０・・・タンデソシュスラグ、
１１・・・注湯ノズル。Figure 1 shows the relationship between the precipitation temperature of the oxide phase that first precipitates when the temperature drops in the scum and the amount of vertical cracking in the slab (m/e), and Figure 2 shows the relationship between the precipitation temperature of the oxide phase that first precipitates when the temperature drops in the scum, and the amount of vertical cracking (m/e) in the slab. Fig. 3 is a diagram showing the area in which vertical billeting does not occur in relation to the oxygen concentration (%) in molten steel and the Si/Mn content in molten steel. FIG. 1... Tongue push, 2a, 2b... Cooling drum, 3... Side weir, 4... Hot water pool, 5
... Sealed chamber, 6 ... Closed space, 7 ... Molten metal, 8 ... Slab, 9 ... Pinch roll, 10 ... Tande Soss slag, 11 ... Pouring nozzle .
Claims (1)
ド堰で形成した湯溜り部に溶融金属を注入し、次いで、
該溶融金属を前記冷却ドラムの回転周面で冷却、凝固し
ながら薄肉鋳片を製造する連続鋳造方法において、 前記溶融金属の表層に浮遊する酸化物のうち、温度降下
時に最初に析出する酸化物組成の析出温度を該溶融金属
の液相線温度以下に調整することを特徴とする薄肉鋳片
の連続鋳造方法。 ２、前記溶融金属中のＳｉ／Ｍｎの比と湯溜り部の不活
性雰囲気中の酸素濃度により、前記酸化物のうち、温度
降下時に最初に析出する酸化物組成の析出温度を調整す
る請求項１記載の方法。[Claims] 1. In an inert atmosphere, molten metal is injected into a pool formed by a part of the circumferential surface of the cooling drum and a side weir, and then,
In a continuous casting method in which a thin slab is produced while the molten metal is cooled and solidified on the rotating peripheral surface of the cooling drum, among the oxides floating on the surface layer of the molten metal, the oxide that precipitates first when the temperature drops. A continuous casting method for thin-walled slabs, characterized in that the precipitation temperature of the composition is adjusted to below the liquidus temperature of the molten metal. 2. The precipitation temperature of the oxide composition that is the first to precipitate when the temperature drops is adjusted by the Si/Mn ratio in the molten metal and the oxygen concentration in the inert atmosphere of the molten metal. The method described in 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4099190A JP2809464B2 (en) | 1990-02-23 | 1990-02-23 | Continuous casting of thin cast slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4099190A JP2809464B2 (en) | 1990-02-23 | 1990-02-23 | Continuous casting of thin cast slab |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03248747A true JPH03248747A (en) | 1991-11-06 |
| JP2809464B2 JP2809464B2 (en) | 1998-10-08 |
Family
ID=12595898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4099190A Expired - Fee Related JP2809464B2 (en) | 1990-02-23 | 1990-02-23 | Continuous casting of thin cast slab |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2809464B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2762534A1 (en) * | 1997-04-29 | 1998-10-30 | Usinor | CONTINUOUS CASTING INSTALLATION OF METAL STRIPS BETWEEN TWO CYLINDERS |
| KR100368278B1 (en) * | 1997-12-26 | 2003-03-17 | 주식회사 포스코 | Apparatus for preventing scum entrappment in strip casting |
| JP2006515802A (en) * | 2003-01-24 | 2006-06-08 | ニューコア・コーポレーション | Casting of steel strip with low surface roughness and low porosity |
-
1990
- 1990-02-23 JP JP4099190A patent/JP2809464B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2762534A1 (en) * | 1997-04-29 | 1998-10-30 | Usinor | CONTINUOUS CASTING INSTALLATION OF METAL STRIPS BETWEEN TWO CYLINDERS |
| EP0875315A1 (en) * | 1997-04-29 | 1998-11-04 | Usinor | Twin roll continuous caster for metallic strip |
| US6148901A (en) * | 1997-04-29 | 2000-11-21 | Usinor | Plant for the twin-roll continuous casting of metal strip |
| KR100368278B1 (en) * | 1997-12-26 | 2003-03-17 | 주식회사 포스코 | Apparatus for preventing scum entrappment in strip casting |
| JP2006515802A (en) * | 2003-01-24 | 2006-06-08 | ニューコア・コーポレーション | Casting of steel strip with low surface roughness and low porosity |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2809464B2 (en) | 1998-10-08 |
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