JP3849888B2 - Converter outlet steel sleeve - Google Patents
Converter outlet steel sleeve Download PDFInfo
- Publication number
- JP3849888B2 JP3849888B2 JP20777295A JP20777295A JP3849888B2 JP 3849888 B2 JP3849888 B2 JP 3849888B2 JP 20777295 A JP20777295 A JP 20777295A JP 20777295 A JP20777295 A JP 20777295A JP 3849888 B2 JP3849888 B2 JP 3849888B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- converter
- sleeve
- steel sleeve
- molten steel
- 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
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【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。
【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〜１５０ｃｈ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。
【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。
【０００４】
【課題を解決するための手段】
この目的を達成するために、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、一体成形品で構成された出鋼口スリーブの内周面（溶鋼通過面）に５ｍｍ〜３０ｍｍ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。ここで用いるの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言う意味がある。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５ｍｍ〜３０ｍｍとしたのは、５ｍｍ以下では充分にコーティング効果があらわれず３０ｍｍ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。
【０００５】
【実施例１】
容量３００ｔの転炉の内径２４０ｍｍ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１５ｍｍのコーティングをした。
【０００６】
【実施例２】
容量３００ｔの転炉の内径２５０ｍｍ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２０ｍｍ厚で鋳込み施工を行った。
【０００７】
【表１】
【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。[0001]
[Industrial application fields]
The present invention relates to a converter steel outlet sleeve which suppresses mechanical wear due to an initial spall and molten steel flow resulting from current unheated heating and extends its service life.
[0002]
[Prior art]
Conventionally, in a converter, it is the steel outlet sleeve that is most subject to wear of the molten steel flow, and is repaired or replaced every 50 ch to 150 ch. The life of the converter itself is 2000 to 3000 ch, and therefore heavy labor such as hot repair or replacement is performed every 50 to 150.
[0003]
[Problems to be solved by the invention]
The converter outlet sleeve is used without preheating when used. Therefore, there is a temperature difference of 1600 to 1750 ° C. from the molten steel temperature, and when the steel is discharged from the converter, an initial spall is generated on the operating surface of the steel outlet sleeve due to the thermal shock.
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 steel outlet sleeve is reduced.
Further, due to the rise in the steel output temperature and the shortening of the steel output time, the conventional steel output sleeve structure cannot sufficiently cope with the strong melting damage. SUMMARY OF THE INVENTION An object of the present invention is to provide a steel outlet sleeve that eliminates these conventional problems, suppresses mechanical wear due to the initial spall and molten steel flow, and extends its service life.
[0004]
[Means for Solving the Problems]
In order to achieve this object, the present invention has the following configuration. That is, this invention is characterized in that the inner peripheral surface (molten steel passage surface) of the steel outlet sleeve formed of an integrally molded product is coated with an amorphous refractory having a residual expansibility of 5 mm to 30 mm. To do. The residual refractory amorphous refractory used here contains a sillimanite group mineral such as residual sillimanite andalusite and kyanite, and the balance is high refractory powder such as alumina and alumina as a binder. Those containing cement are desirable. And the reason for using the irregular refractory material with residual expansibility is to suppress the initial spall of the sleeve by pressing the steel outlet sleeve by expanding the coating layer, but the coating layer itself is molten steel. It means to suppress melt damage due to flow wear. In addition, when sillimanite group minerals are used, these minerals compose crystals with low thermal conductivity, such as mullite, by the heat of the molten steel, so that the steel outlet sleeve that is coated is not directly subjected to thermal shock from the molten steel. It is for doing so. Coating method of the monolithic refractories, trowelling, hand coating, spraying, casting performed in such, but here the coating thickness was set to 5mm ~ 30mm is sufficiently coated effects appear not 30mm or more at 5mm or less This is because not only the inner hole of the sleeve is narrowed and the flow rate of the molten steel is affected, but also the irregular refractory can be peeled off as the frictional force of the molten steel flow increases.
[0005]
[Example 1]
No. 1 shown in Table 1 on the inner peripheral surface of the steel outlet sleeve of the converter having an inner diameter of 240 mm of the converter having a capacity of 300 t. 1 amorphous refractory was cast and coated with a thickness of 15 mm .
[0006]
[Example 2]
No. 1 in Table 1 is attached to the inner peripheral surface of the steel outlet sleeve of the converter having a capacity of 300 t and an inner diameter of 250 mm . The amorphous refractory shown in 2 was cast at a thickness of 20 mm .
[0007]
[Table 1]
【The invention's effect】
When the construction according to Example 1 was put into practical use, when the conventional amorphous refractory was not coated, the entire service life was repaired once and the repair time was 150 ch with no repair compared to about 150 ch. there were. In the case of Example 2, the total durability was 50 ch with no repair. According to Example 2 of the present invention, 80 ch with no repair was obtained.
In this invention, the residual expandable amorphous refractory is coated on the inner surface of the converter outlet sleeve, thereby suppressing the mechanical wear due to the initial spall of the outlet port sleeve and the molten steel flow. It will improve and bring about excellent effects.
Claims (1)
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 JPH0931520A (en) | 1997-02-04 |
| JP3849888B2 true 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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
1995
- 1995-07-20 JP JP20777295A patent/JP3849888B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0931520A (en) | 1997-02-04 |
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