JP3359728B2 - Continuous casting powder for Ti-containing steel - Google Patents
Continuous casting powder for Ti-containing steelInfo
- Publication number
- JP3359728B2 JP3359728B2 JP05477094A JP5477094A JP3359728B2 JP 3359728 B2 JP3359728 B2 JP 3359728B2 JP 05477094 A JP05477094 A JP 05477094A JP 5477094 A JP5477094 A JP 5477094A JP 3359728 B2 JP3359728 B2 JP 3359728B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- weight
- tio
- continuous casting
- composition
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶接用ソリッドワイヤ
等に用いられるＴｉ濃度が０．１〜０．５％のＴｉ含有
鋼を安定製造するための連続鋳造パウダーに関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting powder for stably producing a Ti-containing steel having a Ti concentration of 0.1 to 0.5% used for a solid wire for welding or the like.
【０００２】[0002]
【従来の技術】従来、本鋼種は造塊法によって製造され
ていたが、生産性や歩留りの向上および省エネルギーを
狙って、連続鋳造で製造されるようになってきた。連続
鋳造するに当り、モールド内の抜熱潤滑を制御するた
め、モールドパウダー（以下パウダーと記す）が用いら
れる。Ｔｉ含有鋼用のパウダーについては、Ｔｉ濃度が
０．１重量％未満の溶鋼に対しては、Ｃ／Ｓが０．６程
度の組成のパウダーが用いられている。2. Description of the Related Art Conventionally, this steel type has been manufactured by an ingot-making method, but has been manufactured by continuous casting in order to improve productivity, yield, and save energy. In continuous casting, mold powder (hereinafter, referred to as powder) is used to control heat removal lubrication in the mold. Regarding powder for Ti-containing steel, powder having a C / S of about 0.6 is used for molten steel having a Ti concentration of less than 0.1% by weight.
【０００３】また、Ｔｉ濃度が約０．１重量％のＴｉ含
有鋼の鋳造に対して、ＣａＯ／Ｓｉ０2 が０．３〜１．
０となるように配合したパウダーが報告されている（特
開昭６１−１７６４５１号公報）。Ａｌ、Ｔｉ、ＲＥＭ
などのスラグ還元性金属元素を含有する鋼を連続鋳造す
る際に、ＳｉＯ2をほとんど含有しない、ＣａＯ、Ａｌ2
Ｏ3，ＴｉＯ2，ＬｉＯ2 ，ＢａＯ，ＭｇＯ，Ｎａ2Ｏ を
主成分とするパウダーが用いられている（特開平５−１
８５１９５号公報）方法が提案されている。[0003] Also, for casting the Ti concentration of about 0.1 wt% of Ti-containing steel, CaO / Si0 2 is 0.3 to 1.
A powder blended to be 0 has been reported (JP-A-61-176451). Al, Ti, REM
When continuously cast steel containing slag reducible metal element such as, hardly contain SiO 2, CaO, Al 2
Powders containing O 3 , TiO 2 , LiO 2 , BaO, MgO, and Na 2 O as main components are used (Japanese Patent Laid-Open No. 5-1).
No. 85195) has been proposed.
【０００４】[0004]
【発明が解決しようとする課題】上記の組成のパウダー
をＴｉ含有量が０．１〜０．５重量％の溶鋼に用いた場
合、（１）式で示す反応や、溶鋼中に浮遊するＴｉＯ2
系介在物のパウダーへの吸収等により、連続鋳造中のパ
ウダーの組成は、大きく変化する。 〔Ｔｉ〕＋（ＳｉＯ2）＝（ＴｉＯ2）＋〔Ｓｉ〕 （１） ここで、〔Ｔｉ〕、〔Ｓｉ〕はそれぞれ溶鋼中のＴｉと
Ｓｉを表わし、（ＳｉＯ2）、（ＴｉＯ2）はそれぞれパ
ウダー中のＳｉＯ2とＴｉＯ2を表わす。When the powder having the above composition is used for molten steel having a Ti content of 0.1 to 0.5% by weight, the reaction represented by the formula (1) and the TiO floating in the molten steel are not considered. Two
The powder composition during continuous casting changes greatly due to absorption of the system inclusions into the powder. [Ti] + (SiO 2 ) = (TiO 2 ) + [Si] (1) Here, [Ti] and [Si] represent Ti and Si in molten steel, respectively, and (SiO 2 ), (TiO 2 ) Represents SiO 2 and TiO 2 in the powder, respectively.
【０００５】なお、本発明者は、詳細な調査により、パ
ウダーの組成変化は上記（１）の反応によるものが大部
分を占め、ＴｉＯ2 系介在物のパウダーへの吸収は、パ
ウダーの組成変化にほとんど影響しないことを明らかに
した。さらに、パウダーの組成によっては、高融点化合
物であるペロブスカイトが晶出し、そのため、粘性、溶
融温度、抜熱特性等パウダーの物性が著しく変化し、ブ
レークアウトの発生等安定鋳造が阻害される。そこで、
該鋼種の安定鋳造を実現するためには、連続鋳造中のパ
ウダー組成の変化を抑制し、高融点相の晶出を防止する
ことが課題である。[0005] The present inventor has found from a detailed investigation that most of the powder composition change is due to the above reaction (1), and the absorption of TiO 2 -based inclusions into the powder is due to the powder composition change. Has little effect. Further, depending on the composition of the powder, perovskite, which is a high melting point compound, is crystallized, so that the physical properties of the powder such as viscosity, melting temperature, heat removal characteristics and the like are remarkably changed, and stable casting such as occurrence of breakout is hindered. Therefore,
In order to realize stable casting of the steel type, it is an object to suppress a change in powder composition during continuous casting and to prevent crystallization of a high melting point phase.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記課題を有
利に解決するためのものであり、その要旨とするところ
は、Ｔｉを０．１〜０．５重量％含有する溶鋼の連続鋳
造用パウダーであって、Ｃａ濃度、ＳｉＯ2濃度、Ｆ濃
度、Ｎａ2Ｏ濃度をそれぞれ重量パーセントで％Ｃａ、
％ＳｉＯ2、％Ｆ、％Ｎａ2Ｏとし、 Ｃ／Ｓ＝１．４・（％Ｃａ−０．５３・％Ｆ）／％Ｓｉ
Ｏ2 とした時、（但しＣ／ＳはＦの影響を考慮した換算塩基
度である。） ０．２≦Ｃ／Ｓ≦０．６ かつ、 １０重量％≦％Ｆ＋％Ｎａ2Ｏ≦３０重量％ かつ、 １．０≦％Ｎａ2Ｏ／％Ｆ≦６．０ の範囲の組成であることを特徴とするＴｉ含有鋼用連続
鋳造パウダーである。SUMMARY OF THE INVENTION The present invention advantageously solves the above-mentioned problems, and its gist is to continuously cast molten steel containing 0.1 to 0.5% by weight of Ti. Powder for Ca concentration, SiO 2 concentration, F concentration, Na 2 O concentration by weight percent% Ca,
% / SiO 2 ,% F,% Na 2 O, C / S = 1.4 · (% Ca−0.53 ·% F) /% Si
When O 2 , C / S is a converted basicity in consideration of the influence of F. 0.2 ≦ C / S ≦ 0.6 and 10% by weight ≦% F +% Na 2 O ≦ 30 A continuous casting powder for Ti-containing steel, characterized in that the composition is in the range of 1.0% by weight and 1.0 ≦% Na 2 O /% F ≦ 6.0.
【０００７】[0007]
【作用】以下、本発明について詳細に述べる。前述した
ように、パウダーの組成変化は（１）式の反応により生
じる。 （１）式の反応が起こらなくするためには、パウダー中
のＴｉＯ2 の活量（ａTiO2 p）をできる限り大きくする
ことが重要である。Hereinafter, the present invention will be described in detail. As described above, the change in the composition of the powder is caused by the reaction of the formula (1). In order to prevent the reaction of the formula (1) from occurring, it is important to increase the activity (a TiO2 p ) of TiO 2 in the powder as much as possible.
【０００８】図１は、ＣａＯ−ＳｉＯ2−ＴｉＯ2三元系
におけるＴｉＯ2 の等活量曲線と１５５０℃における固
相晶出領域を示したものである。ここで、％Ｆ＝３重量
％、Ｎａ2Ｏ＝１３重量％である。ＴｉＯ2 の活量（ａ
TiO2 p）は、Ｃ／Ｓが０．６超で急激に小さくなる。す
なわち、パウダー中のＴｉＯ2 の溶解度が急激に大きく
なる。そのため、Ｔｉ含有鋼とパウダーが接触すると、
（１）の反応が進行し、パウダー組成が変化する。さら
に、Ｃ／Ｓが０．６超の領域では、パウダー中にＴｉＯ
2が入るとＣａＴｉＯ3（ペロブスカイト）等の高融点の
固相が晶出する。一方、Ｃ／Ｓが０．２未満では、パウ
ダーの粘性が大きくなり、鋳造特性が悪化する。したが
って、Ｃ／Ｓの範囲は、０．２以上０．６以下とする。
パウダーの組成変化をより小さくし、高融点の固相を晶
出させないためには、Ｃ／Ｓの範囲を０．２以上０．４
以下にすることが望ましい。FIG. 1 shows an isoactivity curve of TiO 2 and a solid phase crystallization region at 1550 ° C. in a ternary system of CaO—SiO 2 —TiO 2 . Here,% F = 3% by weight, Na 2 O = 13% by weight. TiO 2 activity (a
TiO2 p ) sharply decreases when C / S exceeds 0.6. That is, the solubility of TiO 2 in the powder rapidly increases. Therefore, when the powder comes into contact with the Ti-containing steel,
The reaction (1) proceeds, and the powder composition changes. Further, in the region where C / S exceeds 0.6, TiO is contained in the powder.
When 2 enters, a solid phase with a high melting point such as CaTiO 3 (perovskite) crystallizes. On the other hand, if C / S is less than 0.2, the viscosity of the powder increases, and the casting properties deteriorate. Therefore, the range of C / S is set to 0.2 or more and 0.6 or less.
In order to make the change in the composition of the powder smaller and not to crystallize the solid phase having a high melting point, the C / S range should be 0.2 to 0.4.
It is desirable to make the following.
【０００９】ＦとＮａ2Ｏ は、パウダーの融点、粘性調
整用として必要であり、％Ｆ＋％Ｎａ2Ｏ が１０重量％
以上であれば、その目的を達成できる。しかし、％Ｆ＋
％Ｎａ2Ｏ が３０重量％超では、浸漬ノズルの溶損が懸
念される。したがって、％Ｆ＋％Ｎａ2Ｏは１０重量％
以上３０重量％以下とする。F and Na 2 O are necessary for adjusting the melting point and viscosity of the powder, and 10% by weight of% F +% Na 2 O is used.
If it is above, the objective can be achieved. However,% F +
If the% Na 2 O is more than 30% by weight, there is a concern that the immersion nozzle may be damaged. Therefore,% F +% Na 2 O is 10 wt%
Not less than 30% by weight.
【００１０】図２は、ＴｉＯ2 の活量（ａTiO2 p）に及
ぼす％Ｆと％Ｎａ2Ｏの影響を示したものである。ここ
で、Ｃ／Ｓ＝０．４で、％Ｆ＋％Ｎａ2Ｏ ＝２０重量％
である。％Ｎａ2Ｏ／％Ｆが大きいほどＴｉＯ2 の活量
が高くなる。ただし、％Ｎａ2Ｏ／％Ｆが６．０以上で
は、％Ｎａ2Ｏ／％Ｆの増加とともにＴｉＯ2の活量が減
少し、さらに高融点化合物であるペロブスカイトが晶出
する。ＴｉＯ2 の活量を高くし、高融点化合物を晶出さ
せないためには、％Ｎａ2Ｏ ／％Ｆの値を１．０以上
６．０以下にすることが必要である。ＴｉＯ2 の活量を
より高くし、パウダーの組成変化を抑制するためには、
％Ｎａ2Ｏ ／％Ｆの値を４．０以上６．０以下にするこ
とが望ましい。[0010] Figure 2 is a graph showing the effect of% F and% Na 2 O on the activity of the TiO 2 (a TiO2 p). Here, C / S = 0.4,% F +% Na 2 O = 20% by weight
It is. The larger the% Na 2 O /% F, the higher the activity of TiO 2 . However, when% Na 2 O /% F is 6.0 or more, the activity of TiO 2 decreases as% Na 2 O /% F increases, and perovskite, which is a high melting point compound, is further crystallized. In order to increase the activity of TiO 2 and not to crystallize the high melting point compound, the value of% Na 2 O /% F needs to be 1.0 or more and 6.0 or less. In order to increase the activity of TiO 2 and suppress the change in the composition of the powder,
It is desirable that the value of% Na 2 O /% F be 4.0 or more and 6.0 or less.
【００１１】[0011]
【実施例】成分が〔Ｃ〕：０．０１〜０．１重量％、
〔Ｓｉ〕：０．０１〜１．０重量％、〔Ｍｎ〕：１．０
〜２．５重量％、〔Ｐ〕：０．０２重量％以下、
〔Ｓ〕：０．０２重量％以下、〔Ａｌ〕：０．０２重量
％以下、〔Ｔｉ〕：０．１〜０．５重量％で重量が３０
０トンの溶鋼を鋳片のＣ断面が３００ｍｍ×５００ｍｍ
であるモールドを有する連続鋳造設備により、連続鋳造
を行った。EXAMPLES Component [C]: 0.01-0.1% by weight,
[Si]: 0.01 to 1.0% by weight, [Mn]: 1.0
2.5% by weight, [P]: 0.02% by weight or less,
[S]: 0.02% by weight or less, [Al]: 0.02% by weight or less, [Ti]: 0.1 to 0.5% by weight and weight 30
0 ton of molten steel, C section of slab is 300mm x 500mm
Continuous casting was performed by a continuous casting facility having a mold of.
【００１２】その際、表１に示す本発明の組成のパウダ
ーを用いた。表１には、比較のために用いたパウダー組
成を併せて示す。表１に、鋳造開始から３０分後のパウ
ダー中のＴｉＯ2 濃度と鋳造の安定性も併示した。表
中、ＢＯはブレークアウトの発生を表わす。表１から明
らかなように、本発明のパウダーを用いることにより、
パウダーの組成変化を小さくし、安定した鋳造を実現す
ることができる。At that time, powders having the composition of the present invention shown in Table 1 were used. Table 1 also shows the powder compositions used for comparison. Table 1 also shows the TiO 2 concentration in the powder 30 minutes after the start of casting and the stability of casting. In the table, BO indicates the occurrence of a breakout. As is clear from Table 1, by using the powder of the present invention,
A change in the composition of the powder can be reduced, and stable casting can be realized.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【発明の効果】本発明の方法により、Ｔｉ含有鋼の連続
鋳造において、パウダー組成の変化を抑制し、ブレーク
アウトの発生等がない安定した操業が可能となった。そ
の結果、生産性、歩留りの向上および省エネルギーを実
現できた。According to the method of the present invention, in continuous casting of Ti-containing steel, a change in powder composition is suppressed, and stable operation without breakout or the like can be performed. As a result, productivity, yield improvement and energy saving were realized.
【図１】図１は、パウダー中のＴｉＯ2の等活量曲線を
表わす図である。FIG. 1 is a diagram showing an isoactivity curve of TiO 2 in powder.
【図２】図２は、パウダー中のＴｉＯ2の活量に及ぼす
％Ｎａ2Ｏ／％Ｆの影響を表わす図である。FIG. 2 is a graph showing the effect of% Na 2 O /% F on the activity of TiO 2 in powder.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 宏美 千葉県君津市君津１番地 新日本製鐵株 式会社 君津製鐵所内 (72)発明者 松山 利雄 福岡県豊前市大字八屋2544−６ 日鐵建 材工業株式会社内 (56)参考文献 特開 平７−204809（ＪＰ，Ａ) 特開 平７−116797（ＪＰ，Ａ) 特開 平７−116778（ＪＰ，Ａ) 特開 平４−100660（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 11/108 B22D 11/07 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiromi Takahashi 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Inside Kimitsu Works (72) Inventor Toshio Matsuyama 2544-6, Oya, Haya, Buzen-shi, Fukuoka (56) Reference JP-A-7-204809 (JP, A) JP-A-7-116797 (JP, A) JP-A-7-116778 (JP, A) JP-A-4- 100660 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) B22D 11/108 B22D 11/07
Claims (1)
鋼の連続鋳造用パウダーであって、Ｃａ濃度、ＳｉＯ2
濃度、Ｆ濃度、Ｎａ2Ｏ濃度をそれぞれ重量パーセント
で％Ｃａ，％ＳｉＯ2、％Ｆ、％Ｎａ2Ｏとし、 Ｃ／Ｓ＝１．４・（％Ｃａ−０．５３・％Ｆ）／％Ｓｉ
Ｏ2 とした時、 ０．２≦Ｃ／Ｓ≦０．６ かつ、 １０重量％≦％Ｆ＋％Ｎａ2Ｏ≦３０重量％ かつ、 １．０≦％Ｎａ2Ｏ／％Ｆ≦６．０ の範囲の組成であることを特徴とするＴｉ含有鋼用連続
鋳造パウダー。1. A powder for continuous casting of molten steel containing 0.1 to 0.5% by weight of Ti, comprising a Ca concentration, SiO 2
The concentration, the F concentration, and the Na 2 O concentration are expressed as% Ca,% SiO 2 ,% F, and% Na 2 O in weight percent, respectively, and C / S = 1.4 · (% Ca−0.53 ·% F) / % Si
When O 2 , 0.2 ≦ C / S ≦ 0.6 and 10% by weight ≦% F +% Na 2 O ≦ 30% by weight and 1.0 ≦% Na 2 O /% F ≦ 6.0 A continuous casting powder for Ti-containing steel having a composition in the range of:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05477094A JP3359728B2 (en) | 1994-03-02 | 1994-03-02 | Continuous casting powder for Ti-containing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05477094A JP3359728B2 (en) | 1994-03-02 | 1994-03-02 | Continuous casting powder for Ti-containing steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07241655A JPH07241655A (en) | 1995-09-19 |
| JP3359728B2 true JP3359728B2 (en) | 2002-12-24 |
Family
ID=12980011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05477094A Expired - Fee Related JP3359728B2 (en) | 1994-03-02 | 1994-03-02 | Continuous casting powder for Ti-containing steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3359728B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3637895B2 (en) * | 2002-02-05 | 2005-04-13 | 住友金属工業株式会社 | Continuous casting powder and continuous casting method using the same |
| JP4626522B2 (en) * | 2006-01-11 | 2011-02-09 | 住友金属工業株式会社 | Mold powder for continuous casting and continuous casting method for plain steel |
| CN113953472B (en) * | 2021-11-02 | 2023-02-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting covering slag for high titanium steel and preparation method thereof |
-
1994
- 1994-03-02 JP JP05477094A patent/JP3359728B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07241655A (en) | 1995-09-19 |
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