JPH09316524A - Calcium-packed wire - Google Patents
Calcium-packed wireInfo
- Publication number
- JPH09316524A JPH09316524A JP13485496A JP13485496A JPH09316524A JP H09316524 A JPH09316524 A JP H09316524A JP 13485496 A JP13485496 A JP 13485496A JP 13485496 A JP13485496 A JP 13485496A JP H09316524 A JPH09316524 A JP H09316524A
- Authority
- JP
- Japan
- Prior art keywords
- calcium
- wire
- molten steel
- steel
- compound
- 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
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、カルシウム充填ワ
イヤに関し、特に取鍋、タンディッシュ等の精錬容器内
に保持した溶鋼に該ワイヤを送り込む際に生じる窒素ピ
ックアップ等の操業上の不都合を防止する技術に係る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calcium-filled wire, and particularly to prevent operational inconvenience such as nitrogen pickup which occurs when the wire is fed into molten steel held in a refining vessel such as a ladle and a tundish. Related to technology.
【0002】[0002]
【従来の技術】近年、鋼材品質の高級化あるいは製造プ
ロセスの合理化要求に応えるため、製鋼では、溶銑予備
処理〜転炉〜取鍋精錬〜連続鋳造という工程の流れが一
般的になり、精錬機能の分割化を図っている。これら工
程のうち、特に、取鍋精錬は、鋼材の低炭素、燐、硫黄
化並びに介在物の低減等の目的に応じて設備や操業改善
が加えられ、最近では、[C]≦20ppm,[S]≦
10ppm,[O]≦10ppmの鋼材が製造されるよ
うになっている。また、溶鋼中[N]が高いと、窒化物
系介在物が多くなり、鋼材の割れに影響を与える。しか
しながら、取鍋精錬に所謂RH真空脱ガス法を用いて
も、それだけでは脱窒が十分に行われない。そのため、
極低窒素鋼を製造するには、溶銑予備処理での脱燐銑を
出発原料として、転炉で所謂スラグレス精錬や上底吹き
吹錬を行い、吹止の[N]をできるだけ低減し、以降の
工程では大気からの吸窒(ピックアップ)を徹底的に防
止する方法が取られ、現在では、[N]≦25ppmの
鋼材も得られるようになった。2. Description of the Related Art In recent years, in order to meet the demands for higher quality steel products and rationalization of manufacturing processes, in steelmaking, the process flow of hot metal pretreatment-converter-ladle refining-continuous casting has become common and the refining function Is being divided. Among these processes, especially in ladle refining, equipment and operation improvement are added according to the purpose of low carbon of steel, phosphorus, sulfurization and reduction of inclusions, and recently, [C] ≤ 20 ppm, [ S] ≦
Steel materials with 10 ppm and [O] ≦ 10 ppm are manufactured. Further, when the molten steel [N] is high, the amount of nitride-based inclusions increases, which affects the cracking of the steel material. However, even if the so-called RH vacuum degassing method is used for ladle refining, denitrification is not sufficiently performed by itself. for that reason,
To produce ultra-low nitrogen steel, dephosphorization hot metal pretreatment is used as a starting material, and so-called slagless refining and top-bottom blowing are carried out in a converter to reduce the blow stop [N] as much as possible. In the process (1), a method of thoroughly preventing nitrogen absorption (pickup) from the atmosphere was adopted, and now, steel materials with [N] ≦ 25 ppm can also be obtained.
【0003】一方、高級品質の鋼材に、例えば、特開昭
54−121262号公報に開示されたように、石油や
天然ガスの搬送に用いる耐HIC鋼等の所謂カルシウム
添加鋼がある。それらの鋼材は、製鋼段階で溶鋼中の硫
黄をカルシウムの添加でカルシウム系介在物として浮上
分離させ清浄化して製造される。その際、カルシウムの
添加は、種々の方法で行なわれていたが、現在は、図4
(a)に示すようなワイヤ・フィーダ法が多用されてい
る。このカルシウム入りワイヤとして特開昭54−72
750号公報に開示されたものがあるが、図4(b)の
ように金属カルシウム単体、あるいはカルシウム化合物
の粉末をFeテープ(別称、鉄フープという)で被覆し
た構造のワイヤ1を、変速装置を備えたワイヤ・フィー
ダ3を介して所定の速度で溶鋼内に送り込むのである。
この方法によって、蒸気圧が高く溶鋼に入れ難いカルシ
ウムを安定して供給できるようになった。On the other hand, high-quality steel materials include, for example, so-called calcium-added steel such as HIC-resistant steel used for transporting petroleum and natural gas, as disclosed in Japanese Patent Laid-Open No. 54-12162. These steel materials are manufactured by removing sulfur in molten steel at the stage of steelmaking by the addition of calcium to float and separate it as calcium-based inclusions for cleaning. At that time, calcium was added by various methods.
The wire feeder method as shown in (a) is often used. As this calcium-containing wire, Japanese Patent Laid-Open No. 54-72
There is one disclosed in Japanese Patent Publication No. 750, but as shown in FIG. 4 (b), a wire 1 having a structure in which a metallic calcium simple substance or a powder of a calcium compound is covered with an Fe tape (also called an iron hoop) It is fed into the molten steel at a predetermined speed through the wire feeder 3 provided with.
By this method, it became possible to stably supply calcium, which has a high vapor pressure and is difficult to put in molten steel.
【0004】しかしながら、このワイヤ・フィーダ法を
採用し、実際に連続鋳造機のタンディッシュでカルシウ
ム・シリコン合金の添加を行ったところ、下記ような問
題が生じた。まず、使用ワイヤ1の銘柄によって窒素ピ
ックアップ量が一定せず、10ppm以上のピックアッ
プになる場合がある。耐HIC鋼の場合、これでは鋼中
窒素の許容量10ppmを超える。また、粉塵発生もワ
イヤ1の銘柄によって異なり、著しい時には作業環境が
悪化し、さらに、鋳型へ注湯するノズルの開口近傍に付
着する地鉄が成長し、ノズル詰りが原因となって所謂連
々鋳造の回数に制約が生じた。However, when this wire feeder method was adopted and the calcium-silicon alloy was actually added in the tundish of the continuous casting machine, the following problems occurred. First, depending on the brand of the wire 1 used, the nitrogen pickup amount may not be constant, and the pickup amount may be 10 ppm or more. In the case of HIC resistant steels, this exceeds the allowable nitrogen content in the steel of 10 ppm. The dust generation also differs depending on the brand of the wire 1, and when it is significant, the working environment deteriorates, and further, the base metal that adheres to the vicinity of the opening of the nozzle for pouring the molten metal into the mold grows, causing nozzle clogging, which is what is called continuous casting. There was a restriction on the number of times.
【0005】[0005]
【発明が解決しようとする課題】本発明は、かかる事情
を鑑み、カルシウム充填ワイヤの溶鋼添加に際し、チャ
ージ毎の窒素ピックアップ量が安定し、添加位置での粉
塵発生を防止し、作業環境を改善するカルシウム充填ワ
イヤを提供することを目的としている。SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has a stable nitrogen pickup amount for each charge when adding molten steel to a calcium filling wire, prevents dust generation at the addition position, and improves the working environment. The present invention aims to provide a calcium-filled wire.
【0006】[0006]
【課題を解決するための手段】発明者は、上記目的を達
成するため、カルシウム充填ワイヤ(以下、単にワイヤ
ということあり)に充填するカルシウム含有物の粉末自
体の粒度分布に着眼した。つまり、銘柄の異なるワイヤ
の充填物を抜き出し、粒度分布を調査したところ、最大
粒径は1mmに抑えられているが、下限粒度がそれぞれ
の銘柄でまちまちであった。カルシウムは、蒸気圧が高
く、溶鋼内成分と激しい反応を起こすことから、発明者
は細粒側の限定が必要と考え、鋭意研究を重ね、本発明
を完成させた。すなわち、本発明は、溶鋼中に送り込ま
れ、該溶鋼にカルシウムを添加する金属カルシウムある
いはカルシウム化合物を鉄フープで被覆してなるカルシ
ウム充填ワイヤにおいて、上記金属カルシウムあるいは
カルシウム化合物の粒度を150μm以上1mm以下の
範囲としたことを特徴とするカルシウム充填ワイヤであ
る。また、本発明は、上記カルシウム化合物をカルシウ
ム・シリコン合金としてなることを特徴とするカルシウ
ム充填ワイヤでもある。In order to achieve the above-mentioned object, the inventor has focused on the particle size distribution of the powder itself of the calcium-containing wire to be filled in the calcium-filled wire (hereinafter sometimes referred to simply as the wire). That is, when the fillers of different brands were extracted and the particle size distribution was investigated, the maximum particle size was suppressed to 1 mm, but the lower limit particle size was different for each brand. Since calcium has a high vapor pressure and causes a violent reaction with the components in the molten steel, the inventor thought that it was necessary to limit the fine grain side, and earnestly conducted research to complete the present invention. That is, the present invention relates to a calcium-filled wire which is fed into molten steel and is coated with metallic calcium or a calcium compound for adding calcium to the molten steel with an iron hoop, wherein the particle size of the metallic calcium or calcium compound is 150 μm or more and 1 mm or less. It is a calcium-filled wire characterized in that The present invention also provides a calcium-filled wire, characterized in that the calcium compound is a calcium-silicon alloy.
【0007】本発明では、溶鋼にカルシウムを添加する
所謂カルシウム充填ワイヤを上記のような構成としたの
で、溶鋼とカルシウムとの過激な反応が抑制でき、新し
い鋼浴面が空気と触れる機会を減らし、溶鋼の窒素ピッ
クアップ量を減少できるようになる。また、ワイヤ送り
込み位置でのダスト発生も減り、良好な作業環境が維持
できるようになる。In the present invention, since the so-called calcium-filled wire for adding calcium to molten steel has the above-mentioned structure, it is possible to suppress the radical reaction between molten steel and calcium, and to reduce the chance that a new steel bath surface comes into contact with air. , It becomes possible to reduce the amount of nitrogen picked up in molten steel. In addition, the generation of dust at the wire feeding position is reduced, and a good working environment can be maintained.
【0008】[0008]
【発明の実施の形態】図2は、従来から存在しているワ
イヤ充填物の粒度分布の一例である。この粒度分布で前
記問題があったことから、適正な粒度分布の選定を検討
したところ、図1に示すような150μm以下の細粒を
カットした場合が最も良い結果になった。つまり、15
0μm以下の細粒が多いと、反応が早すぎて溶鋼の撹拌
作用が大きくなり、浴面に新しい溶湯が出現する機会が
多くなる。そこで、本発明では、細粒側をその粒度で限
定することにした。一方、粒径が大きくなると逆に反応
が遅くなり過ぎ、カルシウムと硫黄等との介在物形成を
遅くする。また、ワイヤ1の線径が従来から7mm以下
であるので、充填率も配慮し、本発明では従来通り1m
mにした。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is an example of a particle size distribution of a wire filling that has been conventionally existing. Since this particle size distribution had the above problem, the selection of an appropriate particle size distribution was examined, and the best results were obtained when fine particles of 150 μm or smaller as shown in FIG. 1 were cut. That is, 15
If there are many fine particles having a size of 0 μm or less, the reaction is too fast and the stirring action of the molten steel becomes large, so that a new molten metal often appears on the bath surface. Therefore, in the present invention, the fine grain side is limited by the grain size. On the other hand, when the particle size is large, the reaction is too slow, which slows the formation of inclusions of calcium and sulfur. In addition, since the wire diameter of the wire 1 is 7 mm or less, the filling rate is also taken into consideration.
m.
【0009】[0009]
【実施例】図1に示した粒度分布を有するカルシウム・
シリコン合金(充填物6)の粉末を、厚みが0.2〜
0.6mmの鉄フープ7を径が13mmのワイヤ状に巻
いたものの中に充填し、本発明に係るカルシウム充填ワ
イヤ1を多数種類製作した。なお、該カルシウム・シリ
コン合金のCa濃度は25〜35重量%であり、充填量
は150〜250g/mである。また、製作したワイヤ
1は、ボビン2にコイル状に巻き取られている。EXAMPLES Calcium having the particle size distribution shown in FIG.
Powder of silicon alloy (filler 6) having a thickness of 0.2 to
A large number of calcium-filled wires 1 according to the present invention were manufactured by filling a 0.6 mm iron hoop 7 wound into a wire having a diameter of 13 mm. The calcium-silicon alloy has a Ca concentration of 25 to 35% by weight and a filling amount of 150 to 250 g / m. The manufactured wire 1 is wound around the bobbin 2 in a coil shape.
【0010】次に、これらのワイヤ1を前記図4に示し
たワイヤ・フィーダ3を用いて、送り速度が最大200
m/分として耐HIC鋼用の溶鋼に送り込み、カルシウ
ム添加を行った。添加場所は、RH真空脱ガス装置から
連続鋳造へ向かう途中の通路に、上記ワイヤ・フィーダ
3と、脱ガス処理後の溶鋼を保持した取鍋4とを配置し
て設けた。なお、本発明に係るワイヤ1は、添加場所を
限定せず、上記場所の他、連続鋳造機のタンディッシュ
等でも良い。Next, these wires 1 are fed at a maximum feed rate of 200 using the wire feeder 3 shown in FIG.
It was fed into the molten steel for HIC resistant steel as m / min to add calcium. The addition place was provided by disposing the wire feeder 3 and the ladle 4 holding the degassed molten steel in a passage on the way from the RH vacuum degassing apparatus to the continuous casting. The wire 1 according to the present invention is not limited to the addition place, and may be a tundish of a continuous casting machine or the like in addition to the above place.
【0011】終わりに、本発明の効果を窒素ピックアッ
プで、図3に示す。図3より、本発明に係るカルシウム
充填ワイヤ1を使用した場合、その使用時の鋼中窒素の
増量は、従来のワイヤ使用時に比べて、平均で5ppm
程度小さいことがわかる。この5ppmが、耐HIC鋼
の製造にとって重要であり、その成分許容範囲内に収め
ることに成功したのである。また、これらワイヤ1送込
み時のダスト発生状態も以前に比較して大幅に改良さ
れ、通常の集塵設備の使用で良好な作業環境が確保でき
た。Finally, the effect of the present invention is shown in FIG. 3 with a nitrogen pickup. From FIG. 3, when the calcium-filled wire 1 according to the present invention is used, the increase in nitrogen in the steel during its use is 5 ppm on average as compared with the conventional wire use.
You can see that it is small. This 5 ppm is important for the production of HIC-resistant steel, and it has succeeded in staying within its component allowable range. In addition, the state of dust generation when these wires 1 were fed was also greatly improved compared to the previous time, and a good working environment could be secured by using ordinary dust collecting equipment.
【0012】[0012]
【発明の効果】以上述べたように、本発明により、溶鋼
へ送り込む際の鋼中窒素のピックアップが抑制でき、所
謂カルシウム添加鋼の製造が安定して行われるようにな
った。また、同時に副次的な作業環境の改善効果も得ら
れた。As described above, according to the present invention, it is possible to suppress the pickup of nitrogen in the steel when it is fed into the molten steel, so that the so-called calcium-added steel can be stably manufactured. At the same time, a secondary work environment improvement effect was also obtained.
【図1】本発明に係るカルシウム充填ワイヤに使用した
充填物の粒度分布例である。FIG. 1 is an example of particle size distribution of a filler used for a calcium-filled wire according to the present invention.
【図2】従来のカルシウム充填ワイヤに使用した充填物
の粒度分布例である。FIG. 2 is an example of particle size distribution of a filler used in a conventional calcium-filled wire.
【図3】本発明に係るカルシウム充填ワイヤと従来のも
のを使用した時の鋼中窒素量の変化を示す図である。FIG. 3 is a diagram showing changes in the nitrogen content in steel when a calcium-filled wire according to the present invention and a conventional wire are used.
【図4】ワイヤ・フィーダ法を説明する図であり、
(a)はカルシウム充填ワイヤを溶鋼に送り込む装置を
示す縦断面図、(b)はカルシウム充填ワイヤの断面図
である。FIG. 4 is a diagram illustrating a wire feeder method,
(A) is a longitudinal sectional view showing an apparatus for feeding a calcium-filled wire into molten steel, and (b) is a cross-sectional view of the calcium-filled wire.
1 カルシウム充填ワイヤ(ワイヤ) 2 ボビン 3 ワイヤ・フィーダ 4 取鍋(精錬容器) 5 集塵ダクト 6 充填物(金属カルシウムあるいは化合物) 7 鉄フープ 8 台車 9 集塵フード 1 Calcium-filled wire (wire) 2 Bobbin 3 Wire feeder 4 Ladle (smelting vessel) 5 Dust collection duct 6 Filling material (metal calcium or compound) 7 Iron hoop 8 Truck 9 Dust collection hood
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤村 俊生 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 大島 健二 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 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshio Fujimura 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi (no street address) Inside the Mizushima Steel Works, Kawasaki Steel Works (72) Kenji Oshima 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi (no street number) ) Kawasaki Steel Works Mizushima Steel Works
Claims (2)
ムを添加する金属カルシウムあるいはカルシウム化合物
を鉄フープで被覆してなるカルシウム充填ワイヤにおい
て、 上記金属カルシウムあるいはカルシウム化合物の粒度を
150μm以上、1mm以下の範囲としたことを特徴と
するカルシウム充填ワイヤ。1. A calcium-filled wire which is fed into molten steel and coated with iron hoops of metallic calcium or calcium compound for adding calcium to the molten steel, wherein the particle size of the metallic calcium or calcium compound is 150 μm or more and 1 mm or less. The calcium-filled wire is characterized in that
リコン合金としてなることを特徴とする請求項1記載の
カルシウム充填ワイヤ。2. The calcium-filled wire according to claim 1, wherein the calcium compound is a calcium-silicon alloy.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13485496A JPH09316524A (en) | 1996-05-29 | 1996-05-29 | Calcium-packed wire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13485496A JPH09316524A (en) | 1996-05-29 | 1996-05-29 | Calcium-packed wire |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09316524A true JPH09316524A (en) | 1997-12-09 |
Family
ID=15138028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13485496A Pending JPH09316524A (en) | 1996-05-29 | 1996-05-29 | Calcium-packed wire |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09316524A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2796398A1 (en) * | 1999-07-12 | 2001-01-19 | Pechiney Electrometallurgie | Coating for calcium particle wire treating molten steel, comprises mineral powder with solid microparticles amounting to small percentage of final mixture |
-
1996
- 1996-05-29 JP JP13485496A patent/JPH09316524A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2796398A1 (en) * | 1999-07-12 | 2001-01-19 | Pechiney Electrometallurgie | Coating for calcium particle wire treating molten steel, comprises mineral powder with solid microparticles amounting to small percentage of final mixture |
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