Iron and steelmaking | |
Название | Refractory ceramics for ingot production from high-quality steels |
Автор | W. Schönwelski, K. Ruwier, S. Foellbach, J. Sperber |
Информация об авторе | Steuler-KCH GmbH (Höhr-Grenzhausen, Germany): Schönwelski W., Mag. Min. Ruwier K., Mag. Eng Foellbach S., Mag. Eng Sperber J., Mag. Eng., e-mail: m.merl@steuler.de |
Реферат | High-quality steel is characterized by absence of ceramic inclusions (so-called “clean steel”) that retard or hamper consequent ingot processing by rolling or forging. Recent developments of refractories already propose content of Al2O3 equals to 92 % as a standard, while materials with 99 b% content of Al2O3 are lo-cated on the threshold between laboratory level and commercial production. It is shown that corrosion susceptibility decreases with rise of alumina content level. Silica is the most weal ceramic component in refractory material that is used in bottom casting in ingots, and alumina content in it should be increased continuously up to maximum level. The authors displayed that complete wettability by steel melt can be achieved in the case when alumina-bearing material, containing nitrides, is used in corrosion resistance tests. Additionally, high-alumina materials practically are subjected to corrosion in rather less amount, comparing with the standard requirements. It is concluded that avoiding appearance of ceramic inclusions is espe-cially important for large ingots and, respectively, for more durable casting. |
Ключевые слова | Refractory ceramics, large ingot production, alumina, silica, nitrides, corrosion resistance, clean steel |
Библиографический список | 1. Eisenkolb, J.; Fandrich, R.; Gerling, R.; Jung, H.-P.: stahl u. eisen 132 (2012) Nr. 5, S. 49/59. 2. Wahlster, M. et al.: Arch. Eisenhüttenw. 41 (1970) Nr. 1, S. 37/42. 3. Patent WO2011054872. 4. de Paula Rettore, R.; Gueguen, E.; W. Ritter, W.: High alumina carbonbonded refractory material for hollowware, Proc. ICRF Conference 2012, Aachen, 3. − 7. Juni 2012. 5. Schoenwelski, W. et al.: High-quality refractories for high-quality steel, Proc. 2nd ICRF, Mailand, Italien, 7. − 9. Mai 2014. |
Language of full-text | русский |
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