JP3780384B2 - Electric hearth stamp material - Google Patents
Electric hearth stamp material Download PDFInfo
- Publication number
- JP3780384B2 JP3780384B2 JP24196894A JP24196894A JP3780384B2 JP 3780384 B2 JP3780384 B2 JP 3780384B2 JP 24196894 A JP24196894 A JP 24196894A JP 24196894 A JP24196894 A JP 24196894A JP 3780384 B2 JP3780384 B2 JP 3780384B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- clinker
- stamp material
- iron
- magnesia
- 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
Links
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- Ceramic Products (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
【０００１】
【産業上の利用分野】
本願発明は、製鋼用電気炉の炉床スタンプ材として好適に使用できる耐用の優れたマグネシア・ドロマイト質スタンプ材に関する。
【０００２】
【従来の技術】
製鋼用電気炉炉床にはマグネシア質のスタンプ材が広く適用されている。近年製鋼は鋼の品質向上等のため操業条件は苛酷化になっており、従来の電気炉炉床材はマグネシア原料の高純度化を図り対処している。しかしながら、耐熱スポーリング性およびスラグ浸潤に伴う構造的スポーリング等で劣っており、炉床材，吹付材での熱間補修を行って操業しているのが現状である。
【０００３】
【発明が解決しようとする課題】
本発明は耐スポーリング性，耐摩耗性，耐食性およびスラグに対する耐浸潤性に優れた製鋼用電気炉炉床用マグネシア・ドロマイト質スタンプ材の提供である
。
【０００４】
【課題を解決するための手段】
本発明に使用する鉄含有マグネシアクリンカーは、焼結性を向上させるために種々検討した結果見出されたものである。具体的には MgO と Fe2O3 の合計量が 80重量％以上であり、かつ MgO が 65〜97重量％，Fe2O3 が 2〜12重量％の化学組成を有する鉄含有マグネシアクリンカーを使用することで達成される。本発明の電気炉炉床スタンプ材は主原料として鉄含有マグネシアクリンカーとドロマイトクリンカーとからなる。使用される鉄含有マグネシアクリンカーは混合物として少なくとも 20重量％以上含有し、かつ Fe2O3 の含有量が 2〜8重量％の範囲のものである。
【０００５】
【作用】
鉄含有マグネシアクリンカーは MgO と Fe2O3 の合計量が 80重量％より少ない範囲，また MgO 含有量が 65％ より少ない範囲では不純物の増大により、クリンカーおよび混合物の耐食性が低下することから、好ましくない。
【０００６】
本発明の電気炉炉床スタンプ材は、上記の鉄含有マグネシアクリンカーとドロマイトクリンカーを主原料とするものであるが、鉄含有マグネシアクリンカーの使用量が 20重量％より少ない範囲および混合物中の Fe2O3 含有量が 2重量％より少ない範囲では耐火物の焼結性が劣り、溶鋼流による摩耗が大きくなり、不適である。また混合物中の Fe2O3 含有量が 8重量％以上になると使用温度域で過焼結となり、スポーリングにより剥離損傷が大きくなり好ましくない。
【０００７】
【実施例】
表１に使用したマグネシアクリンカー，ドロマイトクリンカーの組成を特性を示す。マグネシアクリンカーＡ，Ｂはいずれも本発明の組成範囲にある。表１に示すマグネシアクリンカー，ドロマイトクリンカーを用いて表２の混合割合でスタンプ材を試作した。
表２に示す実施例１〜６は高強度を示し、良好な耐食性および耐スポーリング性を有している。
これに対して比較例７〜９は鉄の含有量が 2重量％より少ないため強度が低く、また耐スポーリング性にも劣る。
比較例１０は鉄含有マグネシアを使用しているが、Fe2O3 が 8.0重量％より多いため耐スポーリング性に劣ることが判明した。
実施例３からなるスタンプ材を電気炉炉床へスタンプ施工し使用したところ耐用はマグネシア質スタンプ材に比較して損耗量が約50％低減し、実炉に供することが可能であることが確認できた。
【０００８】
【発明の効果】
本発明によって鉄を含有するマグネシアクリンカーとドロマイトクリンカーを併用することにより、スラグに対する耐食性，耐スポーリング性および耐摩耗性に優れた製鋼用電気炉炉床スタンプ材を得ることができる。
【表１】
[Industrial application fields]
The present invention relates to a magnesia-dolomite stamp material having excellent durability that can be suitably used as a hearth stamp material for an electric furnace for steel making.
[0002]
[Prior art]
Magnesia-based stamp materials are widely applied to steel furnace hearths. In recent years, steelmaking has become harsh in operating conditions for the purpose of improving the quality of steel, and conventional electric furnace hearth materials have been addressed by purifying magnesia raw materials. However, it is inferior in heat spalling resistance and structural spalling accompanying slag infiltration, and is currently operating with hot repairs with hearth materials and spray materials.
[0003]
[Problems to be solved by the invention]
The present invention provides a magnesia-dolomite stamp material for an electric furnace hearth for steel making that is excellent in spalling resistance, wear resistance, corrosion resistance, and infiltration resistance to slag.
[0004]
[Means for Solving the Problems]
The iron-containing magnesia clinker used in the present invention has been found as a result of various studies to improve the sinterability. Specifically, an iron-containing magnesia clinker having a chemical composition in which the total amount of MgO and Fe 2 O 3 is 80% by weight or more, MgO is 65 to 97% by weight, and Fe 2 O 3 is 2 to 12% by weight. Achieved by using. The electric furnace hearth stamp material of the present invention comprises iron-containing magnesia clinker and dolomite clinker as main raw materials. The iron-containing magnesia clinker used is at least 20% by weight or more as a mixture, and the Fe 2 O 3 content is in the range of 2 to 8% by weight.
[0005]
[Action]
Iron-containing magnesia clinker is preferred because the total amount of MgO and Fe 2 O 3 is less than 80% by weight, and MgO content is less than 65%, because the corrosion resistance of the clinker and the mixture decreases due to increased impurities. Absent.
[0006]
The electric furnace hearth stamp material of the present invention is mainly composed of the above iron-containing magnesia clinker and dolomite clinker, but the amount of iron-containing magnesia clinker used is less than 20% by weight and Fe 2 in the mixture. If the O 3 content is less than 2% by weight, the sinter of the refractory is inferior and wear due to the molten steel flow increases, which is not suitable. Further, if the Fe 2 O 3 content in the mixture is 8% by weight or more, oversintering occurs in the operating temperature range, and peeling damage increases due to spalling, which is not preferable.
[0007]
【Example】
Table 1 shows the characteristics of the compositions of magnesia clinker and dolomite clinker used. Both magnesia clinkers A and B are within the composition range of the present invention. Using the magnesia clinker and dolomite clinker shown in Table 1, a stamp material was manufactured in a mixing ratio shown in Table 2.
Examples 1 to 6 shown in Table 2 show high strength and have good corrosion resistance and spalling resistance.
On the other hand, Comparative Examples 7 to 9 have a low strength and a poor spalling resistance because the iron content is less than 2% by weight.
Comparative Example 10 uses iron-containing magnesia, but Fe 2 O 3 was found to be inferior in spalling resistance because of more than 8.0% by weight.
When the stamp material of Example 3 was stamped on an electric furnace hearth and used, the durability was reduced by about 50% compared to the magnesia stamp material, and it was confirmed that it could be used in an actual furnace. did it.
[0008]
【The invention's effect】
By using the magnesia clinker containing iron and the dolomite clinker according to the present invention, it is possible to obtain an electric hearth stamp material for steel making having excellent corrosion resistance, spalling resistance and wear resistance against slag.
[Table 1]
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24196894A JP3780384B2 (en) | 1994-09-08 | 1994-09-08 | Electric hearth stamp material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24196894A JP3780384B2 (en) | 1994-09-08 | 1994-09-08 | Electric hearth stamp material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0881273A JPH0881273A (en) | 1996-03-26 |
| JP3780384B2 true JP3780384B2 (en) | 2006-05-31 |
Family
ID=17082265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24196894A Expired - Fee Related JP3780384B2 (en) | 1994-09-08 | 1994-09-08 | Electric hearth stamp material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3780384B2 (en) |
-
1994
- 1994-09-08 JP JP24196894A patent/JP3780384B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0881273A (en) | 1996-03-26 |
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