JPH1180826A - Low silicon steel and production thereof - Google Patents
Low silicon steel and production thereofInfo
- Publication number
- JPH1180826A JPH1180826A JP9235899A JP23589997A JPH1180826A JP H1180826 A JPH1180826 A JP H1180826A JP 9235899 A JP9235899 A JP 9235899A JP 23589997 A JP23589997 A JP 23589997A JP H1180826 A JPH1180826 A JP H1180826A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- low
- sio
- production
- cao
- 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.)
- Withdrawn
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、特に鋳片断面の小
さいビレット連続鋳造設備において、安定して鋳造でき
るＡｌを含有する低Ｓｉ鋼及びその製造方法に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low Si steel containing Al which can be stably cast, particularly in a continuous billet continuous casting facility having a small slab cross section, and a method for producing the same.
【０００２】[0002]
【従来の技術】主に線材向けの低Ｓｉ鋼においては、メ
ッキ性の確保などの制約からＳｉ含有量の上限が０．０
０３％となっている。そのため溶鋼の脱酸が不足するた
めＡｌ脱酸を行いＡｌ含有量を０．０１０％以上とし、
凝固時の気泡生成を抑制している。2. Description of the Related Art In low Si steels mainly for wire rods, the upper limit of the Si content is 0.0
03%. Therefore, deoxidation of molten steel is insufficient, so Al deoxidation is performed to make the Al content 0.010% or more.
It suppresses the formation of bubbles during solidification.
【０００３】従って、本鋼種の場合は、Ａｌによって脱
酸しているので、鋼中にＡｌ2 Ｏ3が多量に懸濁し、鋳
造中に浸漬ノズルに付着し、ノズル閉塞を招く可能性が
高かった。しかし、本鋼種は、従来、ブルームという比
較的大断面の鋳造設備で鋳造していたため、浸漬ノズル
の内径、及び吐出孔径が比較的大きく、深刻な問題とは
なっていなかった。しかしながら、最近では、コスト削
減のため、ブルームからビレットへの圧延工程の不要
な、ビレットで直接鋳造するビレット連鋳機が増えつつ
ある。ビレット連鋳機の場合、その断面積が小さくそれ
に伴い浸漬ノズルの内径、及び吐出孔径も小さく、ノズ
ル閉塞が発生し易いという問題が発生した。[0003] Therefore, in the case of the present steel type, since it is deoxidized by Al, a large amount of Al 2 O 3 is suspended in the steel and adheres to the immersion nozzle during casting, so that there is a high possibility of causing nozzle blockage. Was. However, since this steel type has conventionally been cast by a casting facility having a relatively large cross section called bloom, the inner diameter of the immersion nozzle and the diameter of the discharge hole are relatively large, and have not been a serious problem. However, recently, in order to reduce costs, a billet continuous caster for directly casting with a billet, which does not require a rolling step from bloom to billet, is increasing. In the case of a billet continuous caster, the cross-sectional area is small, and accordingly, the inner diameter of the immersion nozzle and the diameter of the discharge hole are also small, and there has been a problem that the nozzle is easily blocked.
【０００４】従来、このノズル閉塞の対策として、例え
ば、特公平３−７７０３４号公報にあるように、多量の
Ｔｉ（Ｚｒ）を含有し、それに伴って生ずるノズル詰ま
りをＡｌとＣａを共存させることにより、ノズル詰まり
を解消している。Conventionally, as a countermeasure against the nozzle blockage, as disclosed in Japanese Patent Publication No. 3-77034, for example, a large amount of Ti (Zr) is contained, and the resulting nozzle clogging is caused by coexistence of Al and Ca. This eliminates nozzle clogging.
【０００５】[0005]
【発明が解決しようとする課題】しかし、前記従来技術
では、Ｓｉが添加されている鋼種であり、Ｃａ添加によ
る復Ｓｉの問題は発生しない。本発明で前提とする鋼種
は、低Ｓｉ鋼であり、低Ｓｉ鋼の場合、例えば、Ｃａを
添加した場合、スラグあるいは、耐火物中のＳｉＯ2 を
Ｃａが還元し、溶鋼中にＳｉが復Ｓｉするという問題が
発生していた。However, in the above-mentioned prior art, the type of steel to which Si is added does not cause the problem of reversion of Si due to the addition of Ca. The steel type assumed in the present invention is low Si steel. In the case of low Si steel, for example, when Ca is added, Ca reduces SiO 2 in the slag or refractory and restores Si in the molten steel. There was a problem of Si.
【０００６】本発明は、上記の問題に鑑みてなされたも
ので、Ａｌ添加材でしかも低Ｓｉ鋼をビレット連鋳機で
も問題なく鋳造できる成分系の鋼とその製造方法を提供
するものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a component-based steel which can be cast from an Al-added material and a low-Si steel with a billet continuous caster without any problem, and a method for producing the same. .
【０００７】[0007]
【課題を解決するための手段】本発明の主旨は、重量％
で、Ａｌ；０．０１０％以上、Ｓｉ；０．０３％以下を
含有する低Ｓｉ鋼において、Ｃａを０．０００５％以上
を含有したことを特徴とする低Ｓｉ鋼。及び、Ｃａ添加
前のスラグ組成を下記の組成に調整することを特徴とす
る上記の低Ｓｉ鋼の製造方法。 （ａ）ＣａＯ／ＳｉＯ2 ；５以上 （ｂ）ＳｉＯ2 ；７（％）以下 上記の低Ｓｉ鋼の製造方法において、更に、耐火物中の
ＳｉＯ2 含有量が７．０（％）以下である鍋を使用する
ことを特徴とする低Ｓｉ鋼の製造方法である。The gist of the present invention is that the weight%
A low-Si steel containing 0.010% or more of Al and 0.03% or less of Si, wherein 0.0005% or more of Ca is contained. The method for producing a low Si steel as described above, wherein the slag composition before adding Ca is adjusted to the following composition. (A) CaO / SiO 2 ; 5 or more (b) SiO 2 ; 7 (%) or less In the above method for producing a low Si steel, when the SiO 2 content in the refractory is 7.0 (%) or less, This is a method for producing low Si steel, characterized by using a certain pot.
【０００８】即ち、本発明は、小断面連続鋳造機におい
て、Ａｌ添加材で低Ｓｉ鋼を鋳造する際に、ノズル閉塞
防止のためにＣａを添加するものであるが、Ｃａによ
る、復Ｓｉを抑制する目的で、Ｃａ添加前の鍋内スラグ
組成を制御し、スラグ中のＳｉＯ2 の絶対値を低減する
と共に、ＳｉＯ2 の活量を低減させるスラグ組成に制御
するものである。さらには、ＳｉＯ2 源となりうる耐火
物中のＳｉＯ2 を抑えた、例えば、中性耐火物の鍋を使
用するものである。That is, according to the present invention, when low-Si steel is cast with an Al-added material in a small-section continuous casting machine, Ca is added to prevent nozzle blockage. in order to suppress and control the pan the slag composition before addition of Ca, while reducing the absolute value of the SiO 2 in the slag, and controls the slag composition to reduce the activity of SiO 2. Furthermore, suppressing the SiO 2 refractory in which can be a SiO 2 source, for example, is to use a pan neutral refractory.
【０００９】[0009]
【発明の実施の形態及び実施例】本発明を鋳型断面サイ
ズ３２５cm2 （１８０mm□ビレット相当）の実機に適用
して鋳造を実施した。その結果が表１である。尚、使用
した鍋材質の主成分は、表２に示す。BEST MODE FOR CARRYING OUT THE INVENTION Casting was carried out by applying the present invention to an actual machine having a mold section size of 325 cm 2 (equivalent to a 180 mm square billet). Table 1 shows the results. In addition, the main components of the pot material used are shown in Table 2.
【００１０】＜水準Ａ、Ｂ＞転炉で吹錬後、出鋼中にＡ
ｌにて脱酸し、出鋼完了後、鍋内バブリングをしながら
ＣａＯを所定量投入し、その後、粉体インジェクション
にてＣａを添加して上記連鋳機にて鋳造した。鍋の材質
はハイアルミナ系の中性鍋を使用した。<Levels A and B> After blowing in a converter, A
After the tapping was completed, a predetermined amount of CaO was added while bubbling inside the pot, and then Ca was added by powder injection and casting was performed by the continuous caster. The material of the pan was a high alumina neutral pan.
【００１１】＜水準Ｃ＞転炉で吹錬後、出鋼中にＡｌに
て脱酸し、粉体インジェクションにて所定量のＣａＯを
添加した後、Ｃａをインジェクション添加して連鋳機に
て鋳造した。鍋の材質はハイアルミナ系の中性鍋を使用
した。<Level C> After blowing in a converter, deoxidizing with Al during tapping, adding a predetermined amount of CaO by powder injection, adding Ca by injection, and using a continuous casting machine. Cast. The material of the pan was a high alumina neutral pan.
【００１２】＜水準Ｄ＞転炉で吹錬後、出鋼中に脱酸
し、鍋内バブリングをしながらＣａＯを所定量投入し、
その後、粉体インジェクションにてＣａを添加して上記
連鋳機にて鋳造した。鍋の材質はジルコン鍋を使用し
た。<Level D> After blowing in a converter, deoxidize during tapping and add a predetermined amount of CaO while bubbling in a pot.
Thereafter, Ca was added by powder injection and casting was performed by the continuous casting machine. The pot material used was a zircon pot.
【００１３】水準Ａ，Ｂ，Ｃ，Ｄ共にＳｉＯ2 、ＣａＯ
／ＳｉＯ2 （以下Ｃ／Ｓと略す）が本発明範囲内に、即
ち、ＳｉＯ2 ：７（％）以下、Ｃ／Ｓ：５以上に制御さ
れており、鋳造状態も問題無く完了した。Levels A, B, C and D are all SiO 2 , CaO
/ SiO 2 (hereinafter abbreviated as C / S) is controlled within the range of the present invention, that is, SiO 2 : 7 (%) or less, C / S: 5 or more, and the casting state was completed without any problem.
【００１４】＜水準Ｅ＞転炉で吹錬後、出鋼中に脱酸
し、粉体インジェクションにてＣａを添加して上記連鋳
機にて鋳造した。鍋の材質はハイアルミナ系の中性鍋を
使用した。水準Ｅでは、Ｃａ添加前のスラグ組成を調整
しなかったのでＳｉＯ2 、Ｃ／Ｓが本発明範囲から外れ
ており、スラグ中のＳｉＯ2 分がＣａによって還元され
たため復Ｓｉが発生し、Ｓｉが品質規格から外れてい
る。<Level E> After blowing in a converter, the steel was deoxidized during tapping, Ca was added by powder injection, and the mixture was cast by the continuous caster. The material of the pan was a high alumina neutral pan. In condition E, I did not adjust the slag composition before addition of Ca and SiO 2, C / S is deviated from the range of the present invention, recovery Si occurs because the SiO 2 minutes in the slag is reduced by Ca, Si Is out of quality standards.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【発明の効果】本発明により、Ａｌ添加材でしかも低Ｓ
ｉ鋼をビレット連鋳機でも問題なく鋳造できる成分系の
鋼とその製造方法を得ることができた。According to the present invention, an Al additive and low S
A component steel and a production method thereof capable of casting i-steel without any problem using a billet continuous caster were obtained.
Claims (3)
低Ｓｉ鋼。1. A low Si steel containing, by weight%, Al: 0.010% or more and Si: 0.03% or less, wherein low Ca steel contains 0.0005% or more of Ca. .
調整することを特徴とする請求項１記載の低Ｓｉ鋼の製
造方法。 （ａ）ＣａＯ／ＳｉＯ2 ；５以上 （ｂ）ＳｉＯ2 ；７（％）以下2. The method for producing a low Si steel according to claim 1, wherein the slag composition before adding Ca is adjusted to the following composition. (A) CaO / SiO 2 ; 5 or more (b) SiO 2 ; 7 (%) or less
いて、更に耐火物中のＳｉＯ2 含有量が７．０（％）以
下である鍋を使用することを特徴とする低Ｓｉ鋼の製造
方法。3. The method for producing a low Si steel according to claim 2, further comprising using a pot having a SiO 2 content of 7.0 (%) or less in the refractory. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9235899A JPH1180826A (en) | 1997-09-01 | 1997-09-01 | Low silicon steel and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9235899A JPH1180826A (en) | 1997-09-01 | 1997-09-01 | Low silicon steel and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1180826A true JPH1180826A (en) | 1999-03-26 |
Family
ID=16992895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9235899A Withdrawn JPH1180826A (en) | 1997-09-01 | 1997-09-01 | Low silicon steel and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1180826A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015501382A (en) * | 2011-10-25 | 2015-01-15 | 宝山鋼鉄股▲分▼有限公司 | Smelting method of high aluminum low silicon ultra pure ferritic stainless steel |
-
1997
- 1997-09-01 JP JP9235899A patent/JPH1180826A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015501382A (en) * | 2011-10-25 | 2015-01-15 | 宝山鋼鉄股▲分▼有限公司 | Smelting method of high aluminum low silicon ultra pure ferritic stainless steel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20041102 |