JPH0931520A - Sleeve for steel tapping hole of converter - Google Patents
Sleeve for steel tapping hole of converterInfo
- Publication number
- JPH0931520A JPH0931520A JP20777295A JP20777295A JPH0931520A JP H0931520 A JPH0931520 A JP H0931520A JP 20777295 A JP20777295 A JP 20777295A JP 20777295 A JP20777295 A JP 20777295A JP H0931520 A JPH0931520 A JP H0931520A
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- converter
- tapping hole
- molten steel
- steel tapping
- 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.)
- Granted
Links
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は現状の無予熱から生ず
る初期スポール及び溶鋼流による機械的摩耗を抑え、そ
の耐用を延ばすようにした転炉出鋼口スリーブに関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a converter tap steel sleeve which suppresses mechanical wear due to an initial spall and molten steel flow caused by the current non-preheating and extends its service life.
【０００２】[0002]
【従来の技術】従来、転炉において、もっとも溶鋼流の
損耗を受けるのは出鋼口スリーブであり、５０ｃｈ〜１
５０ｃｈ毎に補修もしくは交換が行われている。転炉自
身の寿命は２０００ｃｈ〜３０００ｃｈであり、その為
５０〜１５０毎に熱間での補修または交換といった重労
働が行われている。2. Description of the Related Art Conventionally, in a converter, it is the steel exit sleeve that is most damaged by the molten steel flow.
Repairs or replacements are made every 50 channels. The life of the converter itself is 2000 ch to 3000 ch, so that heavy work such as hot repair or replacement is performed every 50 to 150.
【０００３】[0003]
【発明が解決しようとする課題】転炉出鋼口スリーブ
は、使用するにあたり無予熱で使用される。したがって
溶鋼温度とは１６００〜１７５０℃の温度差があり、転
炉からの出鋼時、その熱衝撃によって出鋼口スリーブ稼
働面に初期スポールが生じる。そして現状、無予熱で使
用する上ではヒートショックによる初期スポールを抑え
る十分な方法はなく、出鋼口スリーブの耐用を低下させ
ている。また出鋼温度の上昇及び出鋼時間の短縮により
今までの出鋼口スリーブ構造では、その強烈な溶損に十
分対応できなくなってきた。この発明は、従来のこれら
の問題点を解消させ初期スポール及び溶鋼流による機械
的摩耗を抑え、その耐用を延ばした出鋼口スリーブを提
供することを目的とする。The converter tap hole is used without preheating. Therefore, there is a temperature difference of 1600 to 1750 ° C. from the molten steel temperature, and when tapping the steel from the converter, the thermal shock causes an initial spall on the working surface of the tapping sleeve. At present, there is no sufficient method to suppress the initial spall due to heat shock when used without preheating, and the service life of the tap hole is reduced. Further, due to the rise of the tapping temperature and the shortening of the tapping time, the conventional tapping sleeve structure cannot sufficiently cope with the severe melt loss. SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems of the prior art, to suppress mechanical wear due to an initial spall and molten steel flow, and to provide a tapping sleeve having extended durability.
【０００４】[0004]
【課題を解決するための手段】この目的を達成させるた
めに、この発明は次のような構成としている。すなわ
ち、この発明は、スリーブ２〜１０段積みの分割タイプ
で構成された出鋼口スリーブの内周面（溶鋼通過面）に
５ｍ／ｍ〜３０ｍ／ｍの厚さで残存膨張性を有する不定
形耐火物をコーティングしたことを特徴とするものであ
る。ここで用いる残存膨張性を有する不定形耐火物とは
残存膨張性のシリマナイトアンダリュサイト及びカイア
ナイトなどのシリマナイト族鉱物を含んだもので、残部
はアルミナなどの高耐火粉と結合剤としてアルミナセメ
ントを含有したものが望ましい。そして残存膨張性を有
する不定形耐火物を用いた理由はコーティング層を膨張
させることによって出鋼口スリーブを圧迫し、スリーブ
の初期スポールを抑制することにあるが、それだけにと
どまらず、コーティング層自身が溶鋼流の摩耗による溶
損を抑えるという意味がある。またシリマナイト族鉱物
を用いると、これら鉱物が溶鋼の熱によってムライトな
どの低い熱伝導率を持った結晶を組成し、そのことによ
って被覆された出鋼口スリーブが溶鋼から直接に熱衝撃
を受けないようにするためである。上記不定形耐火物の
コーティング方法は、コテ塗り、手塗り吹付け、鋳込み
などで行えるが、ここでコーティング厚を５ｍ／ｍ〜３
０ｍ／ｍとしたのは、５ｍ／ｍ以下では十分にコーティ
ング効果があらわれず、３０ｍ／ｍ以上ではスリーブの
内孔を狭くし、溶鋼流量に影響を及ぼすだけでなく溶鋼
流の摩擦力の増加に伴なう不定形耐火物の剥離が考えら
れるからである。In order to achieve this object, the present invention has the following configuration. That is, according to the present invention, the inner peripheral surface (molten steel passage surface) of the tap hole sleeve composed of the split type of sleeves 2 to 10 stacked has a residual expansivity of 5 m / m to 30 m / m. It is characterized by being coated with a standard refractory material. Amorphous refractory with residual expansive used here contains residual expansive sillimanite andalucite and sillimanite group minerals such as kyanite, the balance is high refractory powder such as alumina and alumina cement as a binder. It is desirable that it contains. And the reason for using the amorphous refractory having residual expansiveness is to press the tap hole sleeve by expanding the coating layer and suppress the initial spall of the sleeve, but not only that, the coating layer itself This has the meaning of suppressing melting loss due to wear of the molten steel flow. When sillimanite group minerals are used, these minerals form crystals with low thermal conductivity, such as mullite, due to the heat of molten steel, so that the exit tap sleeve coated with them does not receive thermal shock directly from the molten steel. To do so. The above-mentioned irregular refractory material can be coated by a trowel coating method, a hand coating spraying method, a casting method or the like. Here, the coating thickness is 5 m / m to 3
0 m / m means that the coating effect does not appear sufficiently at 5 m / m or less, and the inner hole of the sleeve becomes narrow at 30 m / m or more, which not only affects the molten steel flow rate but also increases the frictional force of the molten steel flow. This is because the amorphous refractory may be peeled off due to the above.
【０００５】[0005]
【実施例１】容量３００ｔの転炉の内径２４０ｍ／ｍの
出鋼口スリーブ内周面に表１で示されたＮｏ．１の不定
形耐火物を鋳込み施工で厚み１５ｍ／ｍのコーティング
をした。Example 1 No. 1 shown in Table 1 was formed on the inner peripheral surface of the tapping sleeve having an inner diameter of 240 m / m in a converter having a capacity of 300 t. The amorphous refractory material of No. 1 was cast to form a coating having a thickness of 15 m / m.
【０００６】[0006]
【実施例２】容量３３０ｔの転炉の内径２５０ｍ／ｍの
出鋼口スリーブ内周面に表１のＮｏ．２に示した不定形
耐火物を２０ｍ／ｍ厚で鋳込み施工を行った。Example 2 No. 1 in Table 1 was applied to the inner peripheral surface of the tapping sleeve having an inner diameter of 250 m / m of a converter having a capacity of 330 t. The amorphous refractory material shown in 2 was cast at a thickness of 20 m / m.
【０００７】[0007]
【表１】 [Table 1]
【０００８】[0008]
【発明の効果】実施例１による施工したものを実用に供
したところ、従来の不定形耐火物をコーティングしてい
ない場合で全耐用が補修１回を行って１５０ｃｈ程度に
対して、無補修で１５０ｃｈの耐用回数であった。また
実施例２の場合、全耐用が無補修で５０ｃｈであったと
ころ、この発明実施例２によると無補修で８０ｃｈの耐
用が得られた。この発明は残存膨張性の不定形耐火物を
転炉出鋼口スリーブ内面にコーティングすることによっ
て、出鋼口スリーブの初期スポール及び溶鋼流による機
械的摩耗を抑えて実施例に見られるように耐用向上を発
揮し、優れた効果をもたらすものである。[Effects of the Invention] When the product constructed according to Example 1 was put into practical use, the entire life was repaired once when the conventional irregular-shaped refractory was not coated. The service life was 150 ch. In the case of Example 2, the total service life was 50 ch without repair, but according to the embodiment 2 of the present invention, service life of 80 ch was obtained without repair. The present invention coats the residual expandable amorphous refractory material on the inner surface of the converter tap sleeve to suppress mechanical wear due to the initial spall of the tap sleeve and molten steel flow and to improve the durability as shown in the examples. It shows an improvement and brings an excellent effect.
Claims (1)
プで構成されており、その内周面に残存膨張性を有する
不定形耐火物をコーティングしたことを特徴とする転炉
出鋼口スリーブ。1. A converter exit steel sleeve, characterized in that the sleeve is of a split type of stacking 2 to 10 layers, and the inner peripheral surface of the sleeve is coated with an unshaped refractory material having residual expansiveness. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20777295A JP3849888B2 (en) | 1995-07-20 | 1995-07-20 | Converter outlet steel sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20777295A JP3849888B2 (en) | 1995-07-20 | 1995-07-20 | Converter outlet steel sleeve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0931520A true JPH0931520A (en) | 1997-02-04 |
| JP3849888B2 JP3849888B2 (en) | 2006-11-22 |
Family
ID=16545276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20777295A Expired - Fee Related JP3849888B2 (en) | 1995-07-20 | 1995-07-20 | Converter outlet steel sleeve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3849888B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006011269A1 (en) * | 2004-07-29 | 2006-02-02 | Krosakiharima Corporation | Discharging hole for molten metal in molten metal container, method of operating converter with the discharging hole, and sleeve exchanging device at discharging hole of molten metal container |
-
1995
- 1995-07-20 JP JP20777295A patent/JP3849888B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006011269A1 (en) * | 2004-07-29 | 2006-02-02 | Krosakiharima Corporation | Discharging hole for molten metal in molten metal container, method of operating converter with the discharging hole, and sleeve exchanging device at discharging hole of molten metal container |
| JP2006037202A (en) * | 2004-07-29 | 2006-02-09 | Kurosaki Harima Corp | Discharging hole structure of molten metal vessel, and apparatus for exchanging sleeve in discharging hole of molten metal vessel |
| KR100830227B1 (en) * | 2004-07-29 | 2008-05-16 | 구로사키 하리마 코포레이션 | Discharging hole for molten metal in molten metal container, method of operating converter with the discharging hole, and sleeve exchanging device at discharging hole of molten metal container |
| JP4608261B2 (en) * | 2004-07-29 | 2011-01-12 | 黒崎播磨株式会社 | Molten metal container outlet structure and sleeve exchange device for molten metal container outlet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3849888B2 (en) | 2006-11-22 |
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