JP2003170252A - Method for casting slab at high speed - Google Patents
Method for casting slab at high speedInfo
- Publication number
- JP2003170252A JP2003170252A JP2001370492A JP2001370492A JP2003170252A JP 2003170252 A JP2003170252 A JP 2003170252A JP 2001370492 A JP2001370492 A JP 2001370492A JP 2001370492 A JP2001370492 A JP 2001370492A JP 2003170252 A JP2003170252 A JP 2003170252A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- mold powder
- speed
- high speed
- carbon 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
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、低炭素鋼ないし極
低炭素鋼の連続鋳造におけるスラブの高速鋳造方法に関
する。
【０００２】
【従来の技術】低炭素鋼ないし極低炭素鋼を高速鋳造す
ると焼き付きが発生し、鋳造速度が２．５ｍ／ｍｉｎ以
上になるとブレークアウトが発生するという問題があ
る。
【０００３】鋳造速度を高めるとモールドパウダの消費
量が減少する。これが焼き付きの原因となるが、焼き付
き発生はモールドに配設した熱電対の温度により検出す
ることができる。
【０００４】
【発明が解決しようとする課題】本発明者らは低炭素鋼
ないし極低炭素鋼の連続鋳造において、ブレークアウト
を生ずることなく高速鋳造を達成する技術について研究
を進め、モールドパウダの特性とその消費量を適正化す
ることにより、ブレークアウトを避けながら高速鋳造す
る技術を開発した。本発明はこのような新規な技術を提
供することを目的とする。
【０００５】
【課題を解決するための手段】本発明は、セメント基材
のモールドパウダを使用して連続鋳造する際に、モール
ドパウダ物性及びオシレーション条件を調整して、モー
ルドパウダの消費量を０．２３ｋｇ／ｍ2以上にして鋳
造し、鋳込み速度２．５ｍ／ｍｉｎ以上の高速鋳造を安
定的に行うことを特徴とするスラブの高速鋳造方法であ
る。本発明では、セメント基材のモールドパウダを用い
る。セメント基材のモールドパウダはセメントと同様の
ＣａＯとＳｉＯ2を主体とする混合物からなるパウダで
ある。このようなモールドパウダの物性に合わせたオシ
レーション条件を調整することにより、モールドパウダ
の消費量を高め、高速鋳造を安定的に行う。
【０００６】
【発明の実施の形態】モールドパウダ中の各成分は、物
性調整剤としてそれぞれ適切な機能を備え、添加時の効
果の強弱もそれぞれ異なる。中でも、塩基度はモールド
パウダの基本的な物性を決める重要な要素で、塩基度
０．６〜１．５をベースとする。これに数種類の物性調
整成分を添加した合成スラグである。一般に、ＣａＯ／
ＳｉＯ2が大きいと、低粘度、高融点（高凝固温度）で
あり、ＣａＯ／ＳｉＯ2が小さいと、高粘度、低融点
（低凝固温度）となる。
【０００７】
【実施例】Ｃ：Ｏ．０５質量％、Ｓｉ：Ｔｒ、Ｍｎ：
０．２０質量％、Ｐ：０．０１８質量％、Ｓ：０．００
５質量％、Ａｌ：０．０２２質量％の低炭素鋼を、厚み
２２０ｍｍ、幅１３００ｍｍのサイズで鋳造するに際
し、モールドパウダとして、パウダ組成中（％ＣａＯ）
と（％ＳｉＯ2）の比で表される塩基度が１．１５で、
１３００℃における粘度が０．６ポアズとなるよう調整
したモールドパウダを用い、オシレーション条件とし
て、ストローク６ｍｍ、振動数１６０ｃｐｍに設定し、
鋳込み速度２．５ｍ／ｍｉｎで鋳造したところ、モール
ドパウダの消費量は０．２６ｋｇ／ｍ2で制御すること
ができ、従来発生していたスラブ焼き付きが発生するこ
となく安定して鋳造できた。図１はモールドパウダの消
費量と焼き付き発生率との関係を示すもので、鋳込み速
度が２．３ｍ／ｍｉｎ及び２．５ｍ／ｍｉｎのデータを
示した。ここでスラブ焼き付き発生率（％）は（焼き付
き発生スラブ枚数）×１００／（鋳造スラブ枚数）であ
る。モールドパウダの消費量が０．２３ｋｇ／ｍ2以上
では焼き付きは全く発生しなかった。
【０００８】
【発明の効果】本発明によれば、ブレークアウトを生ず
ることなく鋳込み速度２．５ｍ／ｍｉｎ以上の高速鋳造
を行うことができ、最大鋳込み速度２．６ｍ／ｍｉｎま
で達成することができた。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed slab casting method for continuous casting of low carbon steel or extremely low carbon steel. 2. Description of the Related Art When low-carbon steel or ultra-low-carbon steel is cast at high speed, seizure occurs, and when the casting speed exceeds 2.5 m / min, breakout occurs. [0003] Increasing the casting speed reduces the consumption of mold powder. This causes seizure, and the occurrence of seizure can be detected by the temperature of the thermocouple provided in the mold. SUMMARY OF THE INVENTION The present inventors have conducted research on a technique for achieving high speed casting without breakout in continuous casting of low carbon steel or ultra low carbon steel. By optimizing the characteristics and consumption, we have developed a technology for high-speed casting while avoiding breakout. An object of the present invention is to provide such a novel technique. SUMMARY OF THE INVENTION [0005] The present invention is to reduce the consumption of mold powder by adjusting the properties and oscillation conditions of the mold powder during continuous casting using a cement-based mold powder. A high-speed slab casting method characterized by performing casting at 0.23 kg / m 2 or more and stably performing high-speed casting at a casting speed of 2.5 m / min or more. In the present invention, a cement base mold powder is used. Cement-based mold powder is a powder composed of a mixture mainly composed of CaO and SiO 2 , similar to cement. By adjusting the oscillation conditions according to the physical properties of the mold powder, the consumption of the mold powder is increased, and the high-speed casting is performed stably. DESCRIPTION OF THE PREFERRED EMBODIMENTS Each component in a mold powder has an appropriate function as a physical property modifier, and the strength of the effect at the time of addition differs. Above all, the basicity is an important factor that determines the basic physical properties of the mold powder, and is based on a basicity of 0.6 to 1.5. This is a synthetic slag to which several kinds of physical property adjusting components are added. Generally, CaO /
If the SiO 2 is large, it has a low viscosity and a high melting point (high solidification temperature), and if the CaO / SiO 2 is small, it has a high viscosity and a low melting point (low solidification temperature). [0007] C: O. 05 mass%, Si: Tr, Mn:
0.20% by mass, P: 0.018% by mass, S: 0.00
5% by mass, Al: 0.022% by mass of low carbon steel is cast with a thickness of 220 mm and a width of 1300 mm as a mold powder in the powder composition (% CaO)
And the basicity expressed by the ratio of (% SiO 2 ) is 1.15,
Using mold powder whose viscosity at 1300 ° C. was adjusted to 0.6 poise, the oscillation conditions were set to a stroke of 6 mm and a frequency of 160 cpm,
When the casting was performed at a pouring speed of 2.5 m / min, the consumption of the mold powder could be controlled at 0.26 kg / m 2 , and the casting could be performed stably without the occurrence of slab seizure which occurred conventionally. FIG. 1 shows the relationship between the consumption amount of the mold powder and the seizure occurrence rate, and shows data when the casting speed is 2.3 m / min and 2.5 m / min. Here, the slab burn-in occurrence rate (%) is (the number of burn-in slabs) × 100 / (the number of cast slabs). When the consumption of the mold powder was 0.23 kg / m 2 or more, no seizure occurred. According to the present invention, high speed casting at a casting speed of 2.5 m / min or more can be performed without causing breakout, and a maximum casting speed of 2.6 m / min can be achieved. did it.
【図面の簡単な説明】
【図１】モールドパウダ消費量と焼き付き発生率との関
係を示すグラフである。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing the relationship between mold powder consumption and burn-in occurrence rate.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大島 健二 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 (72)発明者 山崎 久生 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 (72)発明者 黒瀬 芳和 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 Ｆターム(参考） 4E004 AD10 JA05 MA02 MB14 MC05 NB01 NC01 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kenji Oshima 1-chome, Mizushima-Kawasaki-dori, Kurashiki City, Okayama Prefecture ） Kawasaki Steel Corporation Mizushima Works (72) Inventor Hisao Yamazaki 1-chome, Mizushima-Kawasaki-dori, Kurashiki City, Okayama Prefecture ） Kawasaki Steel Corporation Mizushima Works (72) Inventor Yoshikazu Kurose 1-chome, Mizushima-Kawasaki-dori, Kurashiki City, Okayama Prefecture ） Kawasaki Steel Corporation Mizushima Works F term (reference) 4E004 AD10 JA05 MA02 MB14 MC05 NB01 NC01
Claims (1)
て連続鋳造する際に、モールドパウダ物性及びオシレー
ション条件を調整して、モールドパウダの消費量を０．
２３ｋｇ／ｍ2以上にして鋳造し、鋳込み速度２．５ｍ
／ｍｉｎ以上の高速鋳造を安定的に行うことを特徴とす
るスラブの高速鋳造方法。Claims: 1. When performing continuous casting using a cement-based mold powder, the mold powder physical properties and oscillation conditions are adjusted to reduce the consumption of the mold powder to 0.1%.
Casting at 23kg / m 2 or more, casting speed 2.5m
A high-speed casting method for slabs, characterized by stably performing high-speed casting at a rate of at least / min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001370492A JP2003170252A (en) | 2001-12-04 | 2001-12-04 | Method for casting slab at high speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001370492A JP2003170252A (en) | 2001-12-04 | 2001-12-04 | Method for casting slab at high speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003170252A true JP2003170252A (en) | 2003-06-17 |
Family
ID=19179708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001370492A Pending JP2003170252A (en) | 2001-12-04 | 2001-12-04 | Method for casting slab at high speed |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003170252A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1510272A1 (en) * | 2003-08-29 | 2005-03-02 | JFE Steel Corporation | Method for producing ultra low carbon steel slab |
-
2001
- 2001-12-04 JP JP2001370492A patent/JP2003170252A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1510272A1 (en) * | 2003-08-29 | 2005-03-02 | JFE Steel Corporation | Method for producing ultra low carbon steel slab |
| KR100654738B1 (en) | 2003-08-29 | 2006-12-08 | 제이에프이 스틸 가부시키가이샤 | Method for producing ultra low carbon steel slab |
| CN1299855C (en) * | 2003-08-29 | 2007-02-14 | 杰富意钢铁株式会社 | Method for producing ultra low carbon steel slab |
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