JPH0735308B2 - Irregular shaped refractory lining - Google Patents
Irregular shaped refractory liningInfo
- Publication number
- JPH0735308B2 JPH0735308B2 JP62240682A JP24068287A JPH0735308B2 JP H0735308 B2 JPH0735308 B2 JP H0735308B2 JP 62240682 A JP62240682 A JP 62240682A JP 24068287 A JP24068287 A JP 24068287A JP H0735308 B2 JPH0735308 B2 JP H0735308B2
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- sio
- amount
- weight
- cao
- parts
- Prior art date
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は応力吸収能に優れ、亀裂、剥離を生じ難い、取
鍋内張り用不定形耐火物に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an amorphous refractory for lining a ladle, which has excellent stress absorbing ability and is resistant to cracking and peeling.
従来取鍋内張り不定形耐火物としては、シャモット質、
ロー石質及びジルコン質焼成耐火物が主として使用され
てきたが、近年省エネルギー、省力化の観点から不定形
化が推進され、同類の不定形耐火物が使用されている。As a conventional ladle lined amorphous refractory, chamotte quality,
Raw stone-based and zircon-based fired refractories have been mainly used, but in recent years, the amorphous refractory of the same kind has been used because of the promotion of the irregular shape from the viewpoint of energy saving and labor saving.
しかしながら近年連続鋳造、真空脱ガス法や取鍋精錬等
による高級鋼の増加により、取鍋操業条件は溶鋼温度の
上昇、滞留時間の延長等をもたらし、ますます苛酷化す
る傾向にある。この為、従来の材料では耐用寿命の低下
が著しく、これらの苛酷な条件に適応できる材料の開発
が望まれていた。However, in recent years, due to the increase of high-grade steel by continuous casting, vacuum degassing method, ladle refining, etc., the ladle operating conditions tend to become more and more severe due to an increase in molten steel temperature, extension of residence time, etc. For this reason, the conventional materials have a markedly reduced service life, and it has been desired to develop a material that can be applied to these severe conditions.
このような要請に対し、過去マグネシア等の塩基性材質
が検討されてきたが、熱的スポーリング或いは構造的ス
ポーリングにより剥離損傷を生じやすく、実用化される
までには至っていない。In response to such a request, a basic material such as magnesia has been studied in the past, but peeling damage easily occurs due to thermal spalling or structural spalling, and it has not been put to practical use.
これらの問題を解決すべく本発明者等は特開昭60-60985
においてスピネル‐アルミナ‐アルミナセメント系材料
の使用を提案した。同材料は従来材料に比較して耐食性
にすぐれ、かつ耐スポーリング性、容積安定性も良好な
レベルにあることから、苛酷化する取鍋操業において良
好な実績をもたらしたが、欠点として高荷重軟化材料で
あり、応力吸収能に欠けることから稼働中に亀裂、剥離
を生じる場合があり、耐用の安定性という観点ではまだ
不十分であった。To solve these problems, the inventors of the present invention have disclosed JP-A-60-60985.
In, the use of spinel-alumina-alumina cement-based material was proposed. Compared with conventional materials, this material has excellent corrosion resistance, good spalling resistance, and good volume stability, so it has a good track record in ladle operation, which is becoming severe, but it has a drawback of high load. Since it is a softening material and lacks in stress absorbing ability, it may crack or peel during operation, and it was still insufficient from the viewpoint of stability of durability.
本発明に係る取鍋内張り用不定形耐火物はスピネルクリ
ンカー、アルミナクリンカー及びアルミナセメントから
なり、該材料の化学組成がMgO15〜30重量部、SiO2１〜
３重量部、CaO1〜２重量部の範囲に規制されたものであ
る。The amorphous refractory for ladle lining according to the present invention comprises spinel clinker, alumina clinker and alumina cement, and the chemical composition of the material is MgO 15 to 30 parts by weight, SiO 2 1 to
It is regulated within the range of 3 parts by weight and 1 to 2 parts by weight of CaO.
ここでCaO、SiO2量を規制した理由であるが、これは材
料の応力緩和性、容積安定性、耐食性等を総合的に考慮
し、特に応力緩和性を重視したものである。即ち、CaO
量が１〜２重量部の範囲でも、SiO2量が１重量部よりも
少ない範囲では材料の応力緩和性に乏しく、稼働時に亀
裂、剥離を生じ易く好ましくない。The reason for regulating the amounts of CaO and SiO 2 here is that the stress relaxation property, volume stability, corrosion resistance, etc. of the material are comprehensively taken into consideration, and stress relaxation property is particularly emphasized. That is, CaO
Even if the amount is in the range of 1 to 2 parts by weight, if the amount of SiO 2 is less than 1 part by weight, the stress relaxation property of the material is poor, and cracks and peeling easily occur during operation, which is not preferable.
またSiO2が３重量部より多い範囲ではCaO-SiO2‐Al2O3
系低融物、例えばCaO・Al2O3・２SiO2のアノーサイト及
びMgO-Al2O3‐SiO2系低融物、例えば2MgO・２Al2O3・５
SiO2のコージェライト等の生成量が増大し、応力緩和性
は改善されるものの、容積安定性、耐食性低下の弊害を
生じる。The SiO 2 is CaO-SiO 2 -Al 2 O 3 is greater extent than 3 parts by weight
Low melts such as CaO.Al 2 O 3 .2SiO 2 anorthite and MgO-Al 2 O 3 -SiO 2 low melts such as 2MgO 2Al 2 O 3 .5
Although the amount of SiO 2 cordierite produced increases and the stress relaxation property is improved, the volume stability and corrosion resistance deteriorate.
本発明によるCaO源は主としてアルミナセメントによっ
てもたらされるが、CaO量として１％を越えない範囲で
は前記と同様に応力緩和性が乏しいこと、及び材料の強
度特性が低下することから不適である。またCaO量が２
％を越える範囲では、前記のSiO2が多い場合と同様な弊
害を生じ、好ましくない。The CaO source according to the present invention is mainly provided by alumina cement, but is not suitable because the stress relaxation property is poor and the strength property of the material deteriorates in the range where the CaO content does not exceed 1%. The amount of CaO is 2
If it exceeds the range of%, the same adverse effects as in the case of a large amount of SiO 2 are caused, which is not preferable.
本発明のMgO量の規制は応力緩和性を考慮したものでは
なく、スラグ浸潤性及び容積安定性から範囲を定めたも
のである。即ちMgOが15重量部より少ない範囲ではスラ
グ浸潤が顕著となり、構造的スポーリングを誘発しやす
くなることから好ましくなく、また30重量部よりも多い
範囲では材料中にフリーMgOが増加し、材料中のアルミ
ナとの反応による膨張またはスラグ中のアルミナとの反
応による膨張が顕著となり、稼働面における組織劣化を
もたらすことから不適である。The regulation of the amount of MgO of the present invention does not consider stress relaxation property, but defines the range from the slag infiltration property and volume stability. That is, MgO is not preferable in the range of less than 15 parts by weight because slag infiltration becomes significant and structural spalling is easily induced, and in the range of more than 30 parts by weight, free MgO increases in the material, Is not suitable because the expansion due to the reaction with the alumina or the reaction due to the reaction with the alumina in the slag becomes remarkable and causes the deterioration of the structure on the operating surface.
本発明はかかる規制された化学組成範囲からなるが、本
発明には以下の原料を使用することができる。スピネル
原料としては電融或いは焼結のスピネルクリンカーが適
しており、フリーMgOが少なく、スピネルの理論組成に
接近した原料が好ましい。Although the present invention comprises such a regulated chemical composition range, the following raw materials can be used in the present invention. As a spinel raw material, an electromelting or sintering spinel clinker is suitable, and a raw material having a small amount of free MgO and close to the theoretical composition of spinel is preferable.
粒度的な制約はなく、またAl2O3とMgO以外の不純物量に
も特に制約はないが、SiO2以外の不純物の合量は２重量
部以下が好まい。SiO2については材料中のSiO2量として
規則されているので自ずと制約される。There are no restrictions on grain size, and there are no particular restrictions on the amount of impurities other than Al 2 O 3 and MgO, but the total amount of impurities other than SiO 2 is preferably 2 parts by weight or less. Since SiO 2 is regulated as the amount of SiO 2 in the material, it is naturally restricted.
アルミナ原料は電融或いは焼結のクリンカーを使用する
ことができ、組成的にはSiO2以外の不純物量が２重量部
以下のものが好ましい。SiO2については材料中のSiO2量
として規制されているので自ずと制約される。使用粒度
に関してはアルミナセメン中のCaOと反応し、CaO・６Al
2O3を生成して材料の膨張性を付与させるという観点か
ら、微粉部への使用が適している。As the alumina raw material, an electromelting or sintering clinker can be used, and it is preferable that the amount of impurities other than SiO 2 is 2 parts by weight or less in terms of composition. Since SiO 2 is regulated as the amount of SiO 2 in the material, it is naturally restricted. Regarding the particle size used, it reacts with CaO in alumina cement and CaO ・ 6Al
From the viewpoint of generating 2 O 3 and imparting expandability to the material, it is suitable for use in the fine powder portion.
アルミナセメントはCaO量１〜２重量部の範囲で十分な
強度を発現させることが必要であり、低CaO量で強度発
現性の良好な高アルミナセメント、スーパー高アルミナ
セメントが適している。Alumina cement is required to exhibit sufficient strength in the range of 1 to 2 parts by weight of CaO, and high alumina cement and super high alumina cement having a low CaO content and good strength development are suitable.
本発明はこの他に必要に応じてSiO2原料も使用すること
ができる。一般的にスピネル原料、電融アルミナ、高ア
ルミナセメントで構成された材料の化学組成は、SiO2量
として１重量部以下、多くは0.5重量部にも満たない例
が多く、この場合には特開昭60-60985に示されているよ
うに優れた耐食性、容積安定性等を得ることはできる
が、本発明による優れた応力緩和性を兼備させることは
できない。In the present invention, besides this, a SiO 2 raw material can be used if necessary. Generally spinel raw material, the chemical composition of the fused alumina, materials composed of high alumina cement, 1 part by weight or less as the amount of SiO 2, most often example not less than 0.5 part by weight, in this case especially As shown in KAISHO 60-60985, excellent corrosion resistance, volume stability, etc. can be obtained, but excellent stress relaxation properties according to the present invention cannot be combined.
従ってかかる高純度原料により本発明の材料を得るため
にはSiO2源を添加し、材料のSiO2量を１〜３重量部に調
整する必要性を生じる。SiO2原料としては珪石、珪砂、
溶融シリカ、無定形シリカ等が上げられ、これらの１種
または２種以上を使用することができる。Therefore, in order to obtain the material of the present invention from such a high-purity raw material, it becomes necessary to add a SiO 2 source and adjust the amount of SiO 2 in the material to 1 to 3 parts by weight. As the SiO 2 raw material, silica stone, silica sand,
Fused silica, amorphous silica and the like are mentioned, and one or more of these can be used.
本発明による不定形耐火物は取鍋用炉材として使用さ
れ、流し込みが一般的であるが、吹付材としても使用す
ることができる。これらに適用する際、適時分散剤、硬
化調整剤、凝集剤等を添加することもできる。The amorphous refractory material according to the present invention is used as a ladle furnace material and is generally cast, but it can also be used as a spray material. When applied to these, a dispersant, a curing modifier, an aggregating agent and the like can be added at appropriate times.
以下、実施例によって本発明の効果を具体的に説明す
る。Hereinafter, the effects of the present invention will be specifically described with reference to examples.
なお以下の実施例においてしようした原料の化学組成を
第１表に示す。The chemical compositions of the raw materials used in the following examples are shown in Table 1.
第２表に示す組成物に所定の水を添加して混練した後、
40×40×160mmの形状に鋳込成形した。20℃で24時間養
生し、110℃24時間乾燥後、1500℃３時間焼成後の品質
を測定した。その結果第２表にまとめた。 After adding predetermined water to the composition shown in Table 2 and kneading,
It was cast into a shape of 40 x 40 x 160 mm. After aging at 20 ° C. for 24 hours, drying at 110 ° C. for 24 hours, and calcination at 1500 ° C. for 3 hours, the quality was measured. The results are summarized in Table 2.
実施例１は従来品比較例１の応力緩和性を向上させるた
めに珪石微粉を添加したものであり、耐食性、容積安定
性を劣化させることなく発生応力測定値が低下してお
り、稼働中の亀裂、剥離に対して優れた抵抗性を有す。Example 1 is one in which silica fine powder is added to improve the stress relaxation of the conventional product Comparative Example 1, and the generated stress measurement value is lowered without deteriorating the corrosion resistance and volume stability. Has excellent resistance to cracking and peeling.
実施例２はSiO2量の多いスピネルクリンカーを使用した
ものであり、実施例１と同様なもの効果が得られてい
る。Example 2 uses a spinel clinker having a large amount of SiO 2 , and the same effect as that of Example 1 is obtained.
実施例３は更にSiO2量を多くしたものであり、僅かなが
ら耐食性は低下するものの発生応力はより低い値を示し
ている。SiO2量が３重量部を越える比較例２では発生応
力は小さいものの、耐食性の低下が大きく好ましくな
い。In Example 3, the amount of SiO 2 was further increased, and although the corrosion resistance slightly decreased, the generated stress showed a lower value. In Comparative Example 2 in which the amount of SiO 2 exceeds 3 parts by weight, the stress generated is small, but the corrosion resistance is greatly reduced, which is not preferable.
実施例4,5はMgO量の影響であり、本発明の範囲にあるMg
O量が耐スラグ浸潤性の点で良好であることが分る。MgO
量が本発明の範囲より少ない比較例５ではスラグ浸潤が
大きくなり、また本発明の範囲よりMgO量が多い比較例
６ではフリーMgOが多いことに起因する高膨張の弊害が
あり、不適である。Examples 4 and 5 show the influence of the amount of MgO, which is within the scope of the present invention.
It can be seen that the O content is good in terms of slag infiltration resistance. MgO
In Comparative Example 5 in which the amount is less than the range of the present invention, the slag infiltration becomes large, and in Comparative Example 6 in which the amount of MgO is greater than the range of the present invention, there is the adverse effect of high expansion due to the large amount of free MgO, which is unsuitable. .
実施例６はCaO量を本発明の上限まで増やしたものであ
り、耐食性はやや低下するものの、発生応力は一段と低
下し、構造体としての安定性は向上する。CaO量が少な
い比較例３では発生応力の低下が不十分であること及び
強度レベルが低いことから好ましくない。本発明の範囲
よりCaO量が比較例４では耐食性の低下が大きく、実炉
使用時の溶損速度増大が問題となる。In Example 6, the amount of CaO was increased to the upper limit of the present invention, and although the corrosion resistance was slightly lowered, the generated stress was further lowered and the stability as a structure was improved. Comparative Example 3 in which the amount of CaO is small is not preferable because the reduction of the generated stress is insufficient and the strength level is low. In Comparative Example 4 in which the amount of CaO is more than the range of the present invention, the corrosion resistance is significantly reduced, and the increase in the melt loss rate during use in an actual furnace poses a problem.
（発明の効果） 以上のように本発明品はCaO、SiO2量の規制により、耐
食性、耐スラグ浸潤性をほとんど阻害することなく応力
緩和性を改善することが可能であり、またMgO量の規制
によりスラグ浸潤性、異常膨張抑制を図ることができ
る。これらは実炉使用時の亀裂発生、剥離に対して優れ
た効果を示し、安定して高耐用を得ることを可能にする
ものである。 (Effect of the invention) As described above, the product of the present invention is capable of improving the stress relaxation property by controlling the CaO and SiO 2 amounts, and hardly impairing the corrosion resistance and the slag infiltration resistance. By regulation, slag infiltration and abnormal expansion can be suppressed. These have an excellent effect on crack generation and peeling when using an actual furnace, and enable stable high durability to be obtained.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松尾 三郎 福岡県北九州市八幡東区枝光１―１―１ 新日本製鐵株式会社八幡製鐵所内 (72)発明者 越智 淑行 福岡県北九州市八幡西区東浜町１―１ 黒 崎窯業株式会社内 (72)発明者 川瀬 義明 福岡県北九州市八幡西区東浜町１―１ 黒 崎窯業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Saburo Matsuo 1-1-1 Edamitsu, Yawatahigashi, Kitakyushu, Kitakyushu, Fukuoka Inside Nippon Steel Co., Ltd. Yawata Works (72) Yoshiyuki Ochi, Hachiman, Kitakyushu, Fukuoka Kurosaki Ceramics Co., Ltd. 1-1, Higashihama, Nishi-ku (72) Yoshiaki Kawase 1-1 Kurosaki Ceramics Co., Ltd., Higashihama-cho, Hachimansai-ku, Kitakyushu, Fukuoka
Claims (1)
メントから成る組成物において、その化学組成がMgO15
〜30重量部、SiO2１〜３重量部、CaO1〜２重量部の範囲
にあり、残余の成分が主としてAl2O3であることを特徴
とする取鍋不定形耐火物。1. A composition comprising a spinel raw material, an alumina raw material, and alumina cement, the chemical composition of which is MgO15.
~ 30 parts by weight, SiO 2 1 to 3 parts by weight, CaO 1 to 2 parts by weight, the remaining component is mainly Al 2 O 3 , ladle amorphous refractory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62240682A JPH0735308B2 (en) | 1987-09-28 | 1987-09-28 | Irregular shaped refractory lining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62240682A JPH0735308B2 (en) | 1987-09-28 | 1987-09-28 | Irregular shaped refractory lining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6483575A JPS6483575A (en) | 1989-03-29 |
| JPH0735308B2 true JPH0735308B2 (en) | 1995-04-19 |
Family
ID=17063139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62240682A Expired - Lifetime JPH0735308B2 (en) | 1987-09-28 | 1987-09-28 | Irregular shaped refractory lining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0735308B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0825811B2 (en) * | 1992-01-24 | 1996-03-13 | 黒崎窯業株式会社 | Castable refractories |
| JP2002519302A (en) * | 1998-07-06 | 2002-07-02 | シーメンス アクチエンゲゼルシヤフト | Molding material for producing refractory lining and fired molded member, lining, and method for producing molded member |
| US8904931B2 (en) * | 2003-11-10 | 2014-12-09 | Day International, Inc. | Printing blanket construction and method of making |
-
1987
- 1987-09-28 JP JP62240682A patent/JPH0735308B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6483575A (en) | 1989-03-29 |
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