JPS6157995B2 - - Google Patents
Info
- Publication number
- JPS6157995B2 JPS6157995B2 JP55129936A JP12993680A JPS6157995B2 JP S6157995 B2 JPS6157995 B2 JP S6157995B2 JP 55129936 A JP55129936 A JP 55129936A JP 12993680 A JP12993680 A JP 12993680A JP S6157995 B2 JPS6157995 B2 JP S6157995B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- refractory
- molten steel
- carbon
- resistance
- 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
Links
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Furnace Charging Or Discharging (AREA)
Description
【発明の詳細な説明】
本発明は鋼等の溶融金属の品質向上のためのガ
ス吹込用孔あき耐火物に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a perforated refractory for gas injection for improving the quality of molten metal such as steel.
溶鋼を取鍋内で処理する方法として、温度の調
整、成分の均一化、非金属介在物の除去等溶鋼の
品質向上を目的として不活性ガスを鍋底から吹き
込むことが知られている。この場合、使用される
ガス吹込み部材はアルミナ質、ムライ質、マグネ
シア質等から成る多孔質耐火物又は細孔を有する
緻密質耐火物が知られている。しかしながら従来
のガス吹込用耐火物は、多孔質耐火物について
は、溶鋼に対してあるいは酸素洗浄に対して耐蝕
性が劣り、又溶鋼やノロが浸潤し易く、従つて次
第に通気性が低下すると共にスポーリングにより
剥離が生じ、多数回使用に限度があつた。 As a method for treating molten steel in a ladle, it is known to blow inert gas from the bottom of the ladle for the purpose of improving the quality of molten steel, such as adjusting temperature, homogenizing components, and removing nonmetallic inclusions. In this case, the gas blowing member used is known to be a porous refractory made of alumina, murray, magnesia, etc. or a dense refractory having pores. However, with regard to conventional gas-injected refractories, porous refractories have poor corrosion resistance against molten steel or oxygen cleaning, and are susceptible to infiltration of molten steel and slag, resulting in a gradual decrease in air permeability. Spalling caused peeling, limiting its ability to be used multiple times.
又、細孔を有する緻密質耐火物は初回のガス吹
込みは良好であるが、その使用後には細孔内に溶
鋼の侵入が認められ、スポーリング等により剥落
を生ずる。 In addition, dense refractories having pores perform well when gas is injected for the first time, but after use, molten steel is observed to enter the pores, resulting in spalling and the like.
本発明はアルミナ質、マグネシア質、スピネル
質耐火材に炭素を５〜30重量％含有せしめること
によつて高耐蝕性で、ノロや地金に対する浸潤抵
抗があり、従つて耐スポーリング性の貫通孔を有
するガス吹込用耐火物を開発したものである。 The present invention has high corrosion resistance by containing 5 to 30% by weight of carbon in alumina, magnesia, and spinel refractory materials, and has high corrosion resistance and infiltration resistance against slag and base metal, and therefore has excellent penetration resistance and spalling resistance. We have developed a gas injection refractory with holes.
以下に本発明の実施例を説明する。 Examples of the present invention will be described below.
実施例 １
アルミ粒90部および黒鉛粉10部よりなる混合粉
にタールピツチ15部を加えて充分混練し粉砕造粒
した。これを形押成形したがその際0.1mmの樹脂
によつて硬化させた糸を30本埋設しガス透過孔が
形成させるようにした。これを焼成して第１図に
概略縦断面図で示すようなガス吹込用孔あき耐火
物１を得た。図中、２は縦孔貫通孔、３はガス導
入パイプ、４はガス溜め部を示している。Example 1 15 parts of tar pitch was added to a mixed powder consisting of 90 parts of aluminum particles and 10 parts of graphite powder, thoroughly kneaded, and pulverized into granules. This was molded by stamping, but at that time 30 threads hardened with 0.1 mm resin were embedded to form gas permeation holes. This was fired to obtain a perforated refractory 1 for gas injection as shown in a schematic vertical cross-sectional view in FIG. In the figure, 2 indicates a vertical through hole, 3 indicates a gas introduction pipe, and 4 indicates a gas reservoir.
実施例 ２
アルミナ粒の代りにマグネシア粒を使用した以
外は実施例１と同様にしてガス吹込用孔あき耐火
物を得た。Example 2 A perforated refractory for gas injection was obtained in the same manner as in Example 1 except that magnesia grains were used instead of alumina grains.
実施例 ３
アルミナ粒の代りにスピネル粒を使用した以外
は実施例１と同様にしてガス吹込用孔あき耐火物
を得た。Example 3 A perforated refractory for gas injection was obtained in the same manner as in Example 1 except that spinel grains were used instead of alumina grains.
実施例１乃至３で得られたガス吹込用孔あき耐
火物を使用して溶鋼中にアルゴンガス吹込みを行
つたところ溶鋼の浸潤も認められず、又溶損、ス
ポーリングによる割れも発生せず、多数回の使用
が可能となつた。これは添加したカーボンによる
効果と認められる。 When argon gas was injected into molten steel using the perforated refractories for gas injection obtained in Examples 1 to 3, no infiltration of molten steel was observed, and no cracking due to melting damage or spalling occurred. It has become possible to use it many times. This is recognized as an effect of the added carbon.
即ち、溶鋼に対する濡れが改善されたためによ
るもので、理論的孔径ｒ＝２γcosθ/P（ｒ：溶
鋼が浸入しない孔径の限界直径〔cm〕、θ：溶鋼
の耐火物に対する接触角、Ｐ：溶鋼の圧力〔dy
ｎ／cm〕、γ：溶鋼の表面張力〔dyn/cm2〕）におけ
る接触角θカーボンを配合したために大きくな
り、従つて、従来の材質の同一孔径のものと比較
して溶鋼が侵入し難くなるためである。又カーボ
ンの存在は浸潤抵抗も増大し耐スポーリング性も
優れたものが得られる。 In other words, this is due to the improved wettability of molten steel, and the theoretical pore diameter r = 2γ cos θ/P (r: critical diameter of the pore that does not allow molten steel to penetrate [cm], θ: contact angle of molten steel with refractory, P: molten steel pressure [dy
n/cm], γ: surface tension of molten steel [dyn/cm 2 ]) The contact angle θ increases due to the inclusion of carbon, making it difficult for molten steel to penetrate compared to conventional materials with the same pore diameter. This is to become. Furthermore, the presence of carbon increases the infiltration resistance and provides excellent spalling resistance.
このような炭素の存在量は５〜30重量％である
ことが好ましく、５重量％未満では耐酸化性、耐
蝕性等が低下し、30重量％を越えると耐蝕性が低
下する。孔径は0.05〜0.5mmの範囲のものが好ま
しく、0.5mmを越えると溶鋼が細孔内に侵入して
来るようになり、0.05mm未満では通気抵抗が大き
くなり充分なガスを吹込むことができない。又、
カーボンを配合すべき耐火材はアルミナ、マグネ
シア、スピネル質等が好ましいが、他の材料でも
条件を適宜選定すれば使用不可能ではない。 The amount of such carbon present is preferably 5 to 30% by weight; if it is less than 5% by weight, oxidation resistance, corrosion resistance, etc. will be reduced, and if it exceeds 30% by weight, corrosion resistance will be reduced. The pore diameter is preferably in the range of 0.05 to 0.5 mm; if it exceeds 0.5 mm, molten steel will enter the pores, and if it is less than 0.05 mm, ventilation resistance will increase and sufficient gas cannot be blown into the pore. . or,
Preferably, the refractory material to which carbon is mixed is alumina, magnesia, spinel, etc., but other materials may also be used if conditions are appropriately selected.
このように本発明のガス吹込用耐火物は緻密な
耐火物部分に細孔を設けてガスを吹込むものであ
るため、耐蝕性等もすぐれ、従来に見られない多
数回使用が可能となつた。 As described above, since the gas-injected refractory of the present invention has pores formed in a dense refractory part to inject gas, it has excellent corrosion resistance and can be used many times, which is unprecedented in the past.
第１図は本発明の実施例を示す概略縦断面図で
ある。
１……ガス吹込用孔あき耐火物、２……縦孔貫
通孔、３……ガス導入パイプ、４……ガス溜め
部。
FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention. 1... Perforated refractory for gas injection, 2... Vertical through hole, 3... Gas introduction pipe, 4... Gas reservoir section.
Claims (1)
質、炭素−マグネシウム質、又は炭素−スピネル
質からなる高耐蝕性耐火物に内径が0.05〜0.5mm
の複数個の貫通孔を設けたことを特徴とするガス
吹込用孔あき耐火物。1 A highly corrosion-resistant refractory made of carbon-alumina, carbon-magnesium, or carbon-spinel containing 5 to 30% by weight of carbon with an inner diameter of 0.05 to 0.5 mm.
A perforated refractory for gas injection, characterized by having a plurality of through holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55129936A JPS5755387A (en) | 1980-09-17 | 1980-09-17 | Porous refractory for blowing gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55129936A JPS5755387A (en) | 1980-09-17 | 1980-09-17 | Porous refractory for blowing gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5755387A JPS5755387A (en) | 1982-04-02 |
| JPS6157995B2 true JPS6157995B2 (en) | 1986-12-09 |
Family
ID=15022086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55129936A Granted JPS5755387A (en) | 1980-09-17 | 1980-09-17 | Porous refractory for blowing gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5755387A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0735291B2 (en) * | 1989-12-25 | 1995-04-19 | ハリマセラミック株式会社 | Porous plug for blowing gas |
| JP2509835B2 (en) * | 1991-10-14 | 1996-06-26 | 明智セラミックス株式会社 | Breathable refractory |
| JP5928168B2 (en) * | 2012-06-07 | 2016-06-01 | 品川リフラクトリーズ株式会社 | How to use ladle for collecting ferromanganese slag and ladle for collecting ferromanganese slag |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5454904A (en) * | 1977-10-07 | 1979-05-01 | Kawasaki Steel Co | Oxygen blasting container for steel making |
| JPS55149750A (en) * | 1979-05-11 | 1980-11-21 | Kawasaki Steel Corp | Gas blowing plug for molten metal vessel |
-
1980
- 1980-09-17 JP JP55129936A patent/JPS5755387A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5755387A (en) | 1982-04-02 |
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