JP2931944B2 - Sliding nozzle filling - Google Patents
Sliding nozzle fillingInfo
- Publication number
- JP2931944B2 JP2931944B2 JP12694594A JP12694594A JP2931944B2 JP 2931944 B2 JP2931944 B2 JP 2931944B2 JP 12694594 A JP12694594 A JP 12694594A JP 12694594 A JP12694594 A JP 12694594A JP 2931944 B2 JP2931944 B2 JP 2931944B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- silica sand
- molten steel
- sliding nozzle
- mixture
- 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 - Lifetime
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、タンディッシュ等に装
着されるスライディングノズルのノズル孔充填物に関す
るものである。
【０００２】
【従来の技術】取鍋あるいはタンディッシュ容器に溶鋼
を注入する際、スライディング装置の上部ノズル及び固
定盤が溶鋼に比べて低温であるため、冷却固化し、溶鋼
が流出できないという問題点があった。そしてこの問題
を解決するにあたって、従来はＳｉＯ2を主成分とする
珪砂，アルカリを主成分とする長石を混合して、ノズル
孔に充填する方法が採られている。
【０００３】
【発明が解決しようとする課題】ところが、鋼の品質の
厳格化の要請が増大し、溶鋼の二次精錬の比重が大きく
なったため、鍋での溶鋼保持時間の延長、溶鋼温度の上
昇，溶鋼流動が要求されるようになった。しかしこのた
めに、充填材，特に珪砂が膨張してしまい、自然開口す
るに至らなかった。
【０００４】
【課題を解決するための手段】本発明は上記従来の課題
を解決するためになされたものであって、その要旨とす
るところは、ＳｉＯ2９５重量％以上有する高純度珪砂
とＣｒ2Ｏ3４０〜５０重量％有するクロム鉱との混合物
から成り、（ただし、ここでの混合物の割合は珪砂：ク
ロム鉱１０〜４０重量％：９０〜６０重量％である。）
この混合物中のアルカリ金属酸化物の含有物が２重量％
以下であることを特徴とするスライディングノズル充填
物。
【０００５】本発明は、珪砂の熱膨張を抑える為、クロ
ム鉱を添加することにする。クロム鉱は、珪砂に比べて
融点が高く、熱膨張係数も小さい為、Ｃｒ2Ｏ3の比率を
高める事で焼結層の厚みを抑えることができ、また、溶
鋼品質に対して影響のない事も既に実証済みである。し
かしクロム鉱の比率を高めると、初期焼結層の生成が出
来ずに溶鋼が差し込む為、これもまた自然開孔しにくく
なってしまう。
【０００６】次に珪砂とクロム鉱の配合比について述べ
る。珪砂４０〜１０重量％とクロム鉱６０〜９０重量％
の割合で混合する。珪砂が１０重量％未満の場合、焼結
性がない為、溶鋼が充填材に差し込み、不開孔を招くと
ともに、溶鋼が浸入し詰物の浮上を招く。また、クロム
鉱６０重量％未満の場合、過度な焼結状態となるととも
に、膨張してしまう為、これもまた、不開孔を招く。よ
って、この配合比で混合すると、過度な焼結状態もな
く、溶鋼浸入による浮上もほとんどない。
【０００７】次に粒度について述べる。一般に原料粒径
を大きくすると、溶鋼が差し込み不開孔となる。逆に細
かい場合は、熱伝導率が大きくなることと、接触面積の
増大により、焼結層が増大することが考えられる。よっ
て５９０μｍのあたりが増大している粒度が望ましい。
（図１参照）
【０００８】
【発明の効果】表１に、実施例を示す。実施例によると
自然開孔率９９％以上と極めて優れた実用成績であっ
た。また、地金の浸透も見られず良好な結果となった。
よって珪砂４０〜１０重量％とクロム鉱６０〜９０重量
％の配合比で混合すると過度な焼結状態もなく、溶鋼浸
入による浮上もほとんどない。
【０００９】
【表１】
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle hole filling for a sliding nozzle mounted on a tundish or the like. 2. Description of the Related Art When pouring molten steel into a ladle or a tundish container, since the upper nozzle and the fixed plate of the sliding device are at a lower temperature than the molten steel, they are cooled and solidified, and the molten steel cannot flow out. was there. In order to solve this problem, conventionally, a method has been adopted in which silica sand containing SiO 2 as a main component and feldspar containing an alkali as a main component are mixed and filled into a nozzle hole. However, the demand for stricter steel quality has increased, and the specific gravity of secondary refining of molten steel has increased. Ascent and flow of molten steel are required. However, because of this, the filler, especially silica sand, expanded, and did not lead to natural opening. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and its gist is to provide a high-purity silica sand having a SiO 2 content of 95% by weight or more and a Cr powder. It consists of a mixture with chromite ore having 40 to 50% by weight of 2 O 3 , where the proportion of the mixture is silica sand: 10 to 40% by weight of chromite: 90 to 60% by weight.
2% by weight of alkali metal oxides in this mixture
A sliding nozzle packing characterized by the following. In the present invention, chromite is added to suppress the thermal expansion of silica sand. Chromium ore has a higher melting point and a smaller coefficient of thermal expansion than silica sand, so by increasing the ratio of Cr 2 O 3 the thickness of the sintered layer can be suppressed and there is no effect on the quality of molten steel. Things have already been proven. However, when the ratio of chromium ore is increased, the molten steel is inserted without forming the initial sintered layer, which also makes it difficult to open naturally. Next, the mixing ratio of silica sand and chromium ore will be described. Silica sand 40 to 10% by weight and chromite ore 60 to 90% by weight
Mix in proportions. When the silica sand content is less than 10% by weight, there is no sintering property, so that the molten steel is inserted into the filler to cause non-opening, and the molten steel penetrates to cause the filling to float. If the content of chromium ore is less than 60% by weight, an excessive sintering state occurs and the swelling expands, which also causes non-opening. Therefore, when mixed at this mixing ratio, there is no excessive sintering state, and there is almost no floating due to infiltration of molten steel. Next, the particle size will be described. Generally, when the particle size of the raw material is increased, the molten steel is inserted and becomes unopened. Conversely, in the case of fineness, it is conceivable that the thermal conductivity increases and the sintered area increases due to an increase in the contact area. Therefore, a particle size in which the area around 590 μm is increased is desirable.
(See FIG. 1) [0008] Table 1 shows an embodiment. According to the examples, the natural porosity was 99% or more, which was an extremely excellent practical result. In addition, no infiltration of the metal was observed, and the result was good.
Therefore, if the mixing ratio is 40 to 10% by weight of silica sand and 60 to 90% by weight of chromium ore, there is no excessive sintering state and there is almost no floating due to infiltration of molten steel. [Table 1]
【図面の簡単な説明】
【図１】本発明サンプル品及び従来品の原料粒径と容積
割合との関係を示したグラフである。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing a relationship between a raw material particle size and a volume ratio of a sample product of the present invention and a conventional product.
フロントページの続き (56)参考文献 特開 平７−251261（ＪＰ，Ａ) 特開 平６−71424（ＪＰ，Ａ) 特開 昭64−48662（ＪＰ，Ａ) 特開 昭62−176670（ＪＰ，Ａ) 特開 昭58−167062（ＪＰ，Ａ) 特開 昭57−50269（ＪＰ，Ａ) 特開 昭55−10374（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B22D 41/46 B22D 11/10 340 C04B 35/12 Continuation of the front page (56) References JP-A-7-251261 (JP, A) JP-A-6-71424 (JP, A) JP-A-64-48662 (JP, A) JP-A-62-176670 (JP) , A) JP-A-58-167062 (JP, A) JP-A-57-50269 (JP, A) JP-A-55-10374 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB Name) B22D 41/46 B22D 11/10 340 C04B 35/12
Claims (1)
０〜５０重量％有するクロム鉱との混合物から成り、
（ただし、ここでの混合物の割合は珪砂：クロム鉱１０
〜４０重量％：９０〜６０重量％である。）この混合物
中のアルカリ金属酸化物の含有物が２重量％以下である
ことを特徴とするスライディングノズル充填物。(57) [Claims] High-purity silica sand having 95% by weight or more of SiO 2 and Cr 2 O 3 4
Consisting of a mixture with chromite ore having 0 to 50% by weight,
(However, the proportion of the mixture here is silica sand: chromite 10
-40% by weight: 90-60% by weight. A) a sliding nozzle filling characterized in that the content of alkali metal oxides in this mixture is not more than 2% by weight;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12694594A JP2931944B2 (en) | 1994-05-16 | 1994-05-16 | Sliding nozzle filling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12694594A JP2931944B2 (en) | 1994-05-16 | 1994-05-16 | Sliding nozzle filling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07308763A JPH07308763A (en) | 1995-11-28 |
| JP2931944B2 true JP2931944B2 (en) | 1999-08-09 |
Family
ID=14947789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12694594A Expired - Lifetime JP2931944B2 (en) | 1994-05-16 | 1994-05-16 | Sliding nozzle filling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2931944B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998052708A1 (en) * | 1997-05-23 | 1998-11-26 | Nkk Corporation | Filling sand for apparatus for slidably opening and closing ladles |
| KR100460256B1 (en) * | 2001-10-31 | 2004-12-04 | 주식회사 인텍 | Silica refractory composition for filler |
| JP4497870B2 (en) * | 2003-09-05 | 2010-07-07 | 日新製鋼株式会社 | Nozzle filler |
-
1994
- 1994-05-16 JP JP12694594A patent/JP2931944B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07308763A (en) | 1995-11-28 |
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