JPH0618520A - Method for evaluating corrosion resistance of refractory - Google Patents
Method for evaluating corrosion resistance of refractoryInfo
- Publication number
- JPH0618520A JPH0618520A JP19583792A JP19583792A JPH0618520A JP H0618520 A JPH0618520 A JP H0618520A JP 19583792 A JP19583792 A JP 19583792A JP 19583792 A JP19583792 A JP 19583792A JP H0618520 A JPH0618520 A JP H0618520A
- Authority
- JP
- Japan
- Prior art keywords
- refractory
- slag
- evaluated
- corrosion resistance
- furnace
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐火物特に製鋼用耐火
物の耐食性を評価する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for evaluating the corrosion resistance of refractories, especially refractories for steelmaking.
【０００２】[0002]
【従来の技術】鉄鋼用耐火物の耐食性を評価する手法と
して、従来、高周波誘導炉に前記評価対象耐火物を内張
りし、鋼とごく少量のスラグを溶融して侵食させる試験
法が用いられている。（例えば、「耐火物誌」１９９１
年，４３（２），第７４−７９頁、「耐火物誌」１９９
２年，４４（３），１２９−１３７頁）2. Description of the Related Art Conventionally, as a method for evaluating the corrosion resistance of refractory materials for steel, a test method has been used in which a high-frequency induction furnace is lined with the refractory material to be evaluated, and steel and a very small amount of slag are melted and eroded. There is. (For example, "Refractory Magazine" 1991.
43 (2), pp. 74-79, "Refractory Magazine" 199.
2 years, 44 (3), p.129-137)
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前述の
従来技術における試験法ではスラグ厚みが通常５〜１０
ｍｍ程度であり、これではスラグの厚みが薄すぎて溶鋼
流による巻き込みによりスラグライン部にスラグを確保
することができないため、精度よく評価対象耐火物の耐
食性を評価することができない。また、評価対象耐火物
内部の温度勾配はスラグの浸透性に対する影響が大きい
が、前述の従来技術においては評価対象内部の温度勾配
は考慮していない。このため、従来技術の試験方法では
精度よく評価対象耐火物の耐食性を評価することができ
ない。そこで本発明では、これらの問題を解決するため
精度よく評価対象耐火物の耐食性を評価できる耐火物の
耐食性評価方法を提供することを目的とする。However, in the above-mentioned conventional test method, the slag thickness is usually 5-10.
Since the slag is too thin to secure the slag in the slag line portion due to the entrainment by the molten steel flow, it is not possible to accurately evaluate the corrosion resistance of the refractory to be evaluated. Further, although the temperature gradient inside the refractory to be evaluated has a great influence on the permeability of the slag, the temperature gradient inside the evaluation target is not taken into consideration in the above-mentioned conventional technique. Therefore, the conventional test methods cannot accurately evaluate the corrosion resistance of the refractory to be evaluated. Therefore, an object of the present invention is to provide a method for evaluating the corrosion resistance of a refractory which can accurately evaluate the corrosion resistance of the refractory to be evaluated in order to solve these problems.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、本発明では、高周波誘導炉内に評価対象耐火物を内
張りし、所定量の鋼及び、侵食剤としてスラグを加え、
誘導加熱により溶融させ、前記評価対象耐火物と接触さ
せて評価対象耐火物を侵食させる耐火物の耐食性評価方
法において、予め高周波誘導炉内に断熱材を内張りし、
その内面に評価対象耐火物を内張りし、侵食剤として溶
融状態で１０〜３０ｍｍの厚みになる量のスラグを加
え、耐火物侵食試験を行うことを特徴とする耐火物の耐
食性評価方法を提供することを目的とする。In order to achieve the above object, in the present invention, a refractory to be evaluated is lined in a high frequency induction furnace, and a predetermined amount of steel and slag as an erosion agent are added,
In a corrosion resistance evaluation method of a refractory which is melted by induction heating and is contacted with the evaluation target refractory to erode the evaluation target refractory, a heat insulating material is lined in advance in a high frequency induction furnace,
A refractory corrosion resistance evaluation method, characterized in that a refractory to be evaluated is lined on its inner surface, slag in an amount of 10 to 30 mm in a molten state is added as an erosion agent, and a refractory corrosion test is performed. The purpose is to
【０００５】[0005]
【作用】本発明に用いるスラグは通常の転炉スラグ、電
炉スラグ、二次精錬スラグ等の目的とする窯炉で使用さ
れている組成のものを使用すればよい。本発明において
は、高周波誘導炉の大きさに関わらず溶融状態で１０ｍ
ｍ以上の厚みになる様にスラグを加えて試験すると、溶
鋼流によりスラグが巻き込まれてもスラグライン部にス
ラグが充分確保されるため精度よく評価できる。しか
し、溶融したスラグの厚みが１０ｍｍ未満ではスラグラ
イン部にスラグが充分確保できないため、精度のよい評
価ができない。また、溶融したスラグの厚みが３０ｍｍ
以下であればスラグの交換は容易である。尚、３０ｍｍ
以上のスラグ厚みでも耐火物の耐食性試験法の精度は変
わらないが、高周波誘導加熱に要する電力エネルギーの
損失となるのみであり、３０ｍｍ以下が望ましい。本発
明において、評価対象耐火物背面の断熱材は断熱煉瓦ま
たは断熱ボードを用いる。The slag used in the present invention may have the composition used in the intended kiln such as ordinary converter slag, electric furnace slag and secondary refining slag. In the present invention, regardless of the size of the high frequency induction furnace, it is 10 m in a molten state.
When a test is performed by adding slag to a thickness of m or more, the slag is sufficiently secured in the slag line portion even if the slag is entrained by the molten steel flow, so that the evaluation can be performed accurately. However, if the thickness of the molten slag is less than 10 mm, sufficient slag cannot be secured in the slag line portion, and accurate evaluation cannot be performed. Also, the thickness of the molten slag is 30 mm
Exchange of slag is easy if: 30 mm
Although the accuracy of the corrosion resistance test method for refractory materials does not change even with the above slag thickness, it only causes a loss of electric energy required for high frequency induction heating, and is preferably 30 mm or less. In the present invention, a heat insulating brick or a heat insulating board is used as the heat insulating material on the rear surface of the refractory to be evaluated.
【０００６】本発明の耐火物の耐食性評価方法において
は、実炉の条件として、試験条件の内、耐火物内の温度
勾配を実炉に近くする。例えば、実炉においては内面温
度が１６５０℃、耐火物内部の温度勾配が７．５℃／ｍ
ｍ、耐火物の厚みが１３０ｍｍであれば、背面温度が６
７５℃である。この条件で使用する耐火物の侵食試験を
行うとき、本発明においては、溶鋼温度が１６５０℃、
厚み６５ｍｍの耐火物で試験する場合、耐火物内部の温
度勾配は実炉と同じ７．５℃／ｍｍとする。このとき、
評価対象耐火物背面の温度は１１６３℃と計算で求める
ことができる。実炉における耐火物背面の温度が６７５
℃であり、本発明の耐火物の耐食性評価方法における耐
火物背面の温度が１１６３℃であっても、耐火物内部の
温度勾配が同一であればスラグの浸透性、侵食性は同等
となる。本発明においては、この様な同一条件を再現性
のある様に断熱材の厚みを適宜選定することができる。In the method for evaluating the corrosion resistance of a refractory material according to the present invention, the temperature gradient in the refractory material is set close to that of the real furnace among the test conditions. For example, in an actual furnace, the inner surface temperature is 1650 ° C, and the temperature gradient inside the refractory is 7.5 ° C / m.
m, the refractory thickness is 130 mm, the back temperature is 6
It is 75 ° C. When performing the erosion test of the refractory used under these conditions, in the present invention, the molten steel temperature is 1650 ° C.,
When testing with a refractory material having a thickness of 65 mm, the temperature gradient inside the refractory material is 7.5 ° C./mm, which is the same as in the actual furnace. At this time,
The temperature of the rear surface of the refractory to be evaluated can be calculated to be 1163 ° C. The temperature of the back of the refractory in the actual furnace is 675
Even if the temperature of the back surface of the refractory is 1163 ° C. in the refractory corrosion resistance evaluation method of the present invention, if the temperature gradient inside the refractory is the same, the slag permeability and erosion are the same. In the present invention, the thickness of the heat insulating material can be appropriately selected so that such the same conditions can be reproducibly reproduced.
【０００７】以下、評価対象耐火物背面の断熱材の厚み
選定方法について詳述する。図１は、断熱材の厚みと耐
火物内部の温度勾配との関係を示す図である。図１にお
いて、例えば断熱材Ａの場合に、評価対象耐火物内の温
度勾配７．５℃／ｍｍを確保するためには、断熱材厚み
を２０ｍｍとし、また、評価対象耐火物内の温度勾配
５．０℃／ｍｍを確保するためには、断熱材厚みを３０
ｍｍとすればよい。The method for selecting the thickness of the heat insulating material on the rear surface of the refractory to be evaluated will be described in detail below. FIG. 1 is a diagram showing the relationship between the thickness of the heat insulating material and the temperature gradient inside the refractory material. In FIG. 1, for example, in the case of the heat insulating material A, in order to secure a temperature gradient of 7.5 ° C./mm in the evaluation target refractory, the heat insulating material thickness is set to 20 mm, and the temperature gradient in the evaluation target refractory is set. In order to ensure 5.0 ° C / mm, the thickness of the heat insulating material should be 30
It may be mm.
【０００８】本発明においては、この様に目的とする温
度勾配を耐火物内部に確保するには、使用する断熱材の
材質に応じて予め図１に示す関係を求めておき、この関
係から断熱材の厚みを決定すればよい。侵食させる時間
は測定し易い侵食量が得られるように適宜選択すればよ
く、通常１〜３時間あればよい。In the present invention, in order to secure the desired temperature gradient inside the refractory material as described above, the relationship shown in FIG. 1 is obtained in advance in accordance with the material of the heat insulating material to be used. The thickness of the material may be determined. The time for erosion may be appropriately selected so as to obtain an erosion amount that is easy to measure, and is usually 1 to 3 hours.
【０００９】[0009]
【実施例】２０ｋｇ高周波誘導炉内に評価対象耐火物と
してＡ、Ｂ、Ｃ３種類の耐火物を内張りし、２０ｋｇの
低炭素鋼及び、侵食剤として転炉スラグを加え、誘導加
熱により１６５０℃に加熱して溶融させ、前記評価対象
耐火物と接触させて評価対象耐火物を侵食させる耐火物
の耐食性評価方法を行った。その際、予め高周波誘導炉
内に断熱材を２０ｍｍ内張りし、前記評価対象耐火物を
内張りし、スラグの量は溶融状態で１０〜３０ｍｍの厚
みになる量として耐火物侵食試験を行った。[Example] A 20 kg high-frequency induction furnace is lined with refractory materials of A, B, and C as refractory materials to be evaluated, 20 kg of low-carbon steel and converter slag as an erosion agent are added, and induction heating is performed at 1650 ° C. A method for evaluating corrosion resistance of a refractory which is heated and melted, and is brought into contact with the refractory to be evaluated to corrode the refractory to be evaluated was performed. At that time, a heat insulating material was lined in advance in a high-frequency induction furnace for 20 mm, the refractory to be evaluated was lined, and a slag amount was 10 to 30 mm in a molten state, and a refractory erosion test was performed.
【００１０】試験条件を表１に示す。、また、表１に取
鍋スラグライン部用の耐火物の耐食性を本発明の耐食性
評価方法により試験した結果を示す。Table 1 shows the test conditions. In addition, Table 1 shows the results of testing the corrosion resistance of the refractory material for the ladle slag line by the corrosion resistance evaluation method of the present invention.
【００１１】 [0011]
【００１２】表中の溶損指数は、評価する耐火物の溶損
速度を同じ条件で試験した耐火物Ａの溶損速度で割って
１００倍した値である。本発明の実施例においては、実
炉における溶損指数と試験における溶損指数がよく一致
しており、精度よく評価できる。尚、表１に比較例とし
て、スラグ厚みが本発明より小さいか、あるいは背面の
断熱材が無い場合の耐食性評価試験の結果を合わせて示
す。スラグの厚みが１０ｍｍ未満である比較例４、背面
の断熱材が無い比較例５、６は何れも溶損指数が実炉と
著しく異なっており、精度よく評価できない。The erosion index in the table is a value obtained by dividing the erosion rate of the refractory to be evaluated by the erosion rate of refractory A tested under the same conditions and multiplying by 100. In the examples of the present invention, the melt loss index in the actual furnace and the melt loss index in the test are in good agreement, and the evaluation can be performed accurately. As a comparative example, Table 1 also shows the results of the corrosion resistance evaluation test when the slag thickness is smaller than that of the present invention or when there is no heat insulating material on the back surface. Comparative Example 4 in which the thickness of the slag is less than 10 mm and Comparative Examples 5 and 6 in which there is no heat insulating material on the back surface have remarkably different melt loss indexes from the actual furnace, and therefore cannot be evaluated accurately.
【００１３】[0013]
【発明の効果】以上説明したように、本発明の耐火物の
耐食性評価方法は実炉で使用する際の耐食性を精度よく
評価することができる。As described above, the corrosion resistance evaluation method of the refractory of the present invention can accurately evaluate the corrosion resistance when used in an actual furnace.
【図１】評価対象耐火物内の温度勾配に適する断熱材の
厚みの関係を示す例である。FIG. 1 is an example showing a relationship of a thickness of a heat insulating material suitable for a temperature gradient in a refractory to be evaluated.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大川 清 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 (72)発明者 礒部 利弘 兵庫県高砂市荒井町新浜１−３−１ ハリ マセラミック株式会社内 (72)発明者 末川 幸弘 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 front page (72) Kiyoshi Okawa Kiyoshi Okawa 20-1 Shintomi, Futtsu City, Chiba Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Toshihiro Isobe 1-3-1 Niihama, Arai-cho, Takasago, Hyogo Prefecture Harima Ceramic Co., Ltd. (72) Inventor Yukihiro Suekawa 1-1 Kurosaki Ceramics Co., Ltd. 1-1 Higashihama-cho, Hachimansai-ku, Kitakyushu, Fukuoka
Claims (1)
りし、所定量の鋼及び、侵食剤としてスラグを加え、誘
導加熱により溶融させ、前記評価対象耐火物と接触させ
て評価対象耐火物を侵食させる耐火物の耐食性評価方法
において、予め高周波誘導炉内に断熱材を内張りし、そ
の内面に評価対象耐火物を内張りし、侵食剤として溶融
状態で１０〜３０ｍｍの厚みになる量のスラグを加え、
耐火物侵食試験を行うことを特徴とする耐火物の耐食性
評価方法。1. A refractory to be evaluated by lining a refractory to be evaluated in a high-frequency induction furnace, adding a predetermined amount of steel and slag as an erosion agent, melting by induction heating, and contacting with the refractory to be evaluated. In a method for evaluating the corrosion resistance of a refractory that corrodes a slag, a high-frequency induction furnace is lined with a heat insulating material in advance, and the refractory to be evaluated is lined on the inner surface of the high-frequency induction furnace. And add
A method for evaluating the corrosion resistance of a refractory material, which comprises performing a refractory material corrosion test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19583792A JPH0618520A (en) | 1992-07-01 | 1992-07-01 | Method for evaluating corrosion resistance of refractory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19583792A JPH0618520A (en) | 1992-07-01 | 1992-07-01 | Method for evaluating corrosion resistance of refractory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0618520A true JPH0618520A (en) | 1994-01-25 |
Family
ID=16347835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19583792A Withdrawn JPH0618520A (en) | 1992-07-01 | 1992-07-01 | Method for evaluating corrosion resistance of refractory |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0618520A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007017295A (en) * | 2005-07-07 | 2007-01-25 | Nippon Steel Corp | Refractory testing method and refractory tester |
| JP2009204594A (en) * | 2008-02-29 | 2009-09-10 | Kurosaki Harima Corp | Oxidation resistance evaluating method of carbon-containing refractory |
| US10227810B2 (en) | 2016-08-03 | 2019-03-12 | Ford Global Technologies, Llc | Priority driven power side door open/close operations |
-
1992
- 1992-07-01 JP JP19583792A patent/JPH0618520A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007017295A (en) * | 2005-07-07 | 2007-01-25 | Nippon Steel Corp | Refractory testing method and refractory tester |
| JP2009204594A (en) * | 2008-02-29 | 2009-09-10 | Kurosaki Harima Corp | Oxidation resistance evaluating method of carbon-containing refractory |
| US10227810B2 (en) | 2016-08-03 | 2019-03-12 | Ford Global Technologies, Llc | Priority driven power side door open/close operations |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19991005 |