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An evaluation of the effectiveness of use of hot tops

  • Refractories for the Consumer
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Refractories Aims and scope

Conclusions

For the investigated range of steels the use of hot tops of mullite-silica fiber in place of sand-cellulose hot tops makes it possible to reduce the top cutback from 12 to 10% with providing of the required macrostructural quality of the metal.

The use of the two-layer hot tops makes it possible to reduce the top cutback from 12 to 11% in the production of general purpose carbon and alloy steel.

It is economically desirable to use mullite-silica hot tops on a broad range of types of alloy steel in replacement of chamotte hot tops.

With a thickness of 30 mm such hot tops may be used on the whole range of alloy steel in place of sand-cellulose hot tops. Depending upon the degree of alloying of the steel the saving is 0.23–4.5 rubles/ton.

The use of two-layer hot tops may provide a saving only in replacement of chamotte hot tops for noncritical carbon and alloy steel.

Exothermic hot tops may be used in place of sand-cellulose ones with a value of the steel of 110 rubles/ton and more.

In connection with the difficulty in stripping of ingots with a sinkhead decreased to 200 mm the broad introduction into production of mullite-silica and exothermal hot tops requires the development of a design and the replacement of the clamps of stripper and tong cranes.

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Literature cited

  1. GOST 23619-79. Glass-Fiber Thermal-Insulation Refractory Materials and Parts [in Russian], USSR.

  2. I. T. Tapilin, Chern. Met., Byul. Inst. “Chermetinformatsiya,” No. 2, 10–23 (1983).

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  3. M. I. Kolesov, D. D. Smirnov, A. S. Gninenko, et al., Ekspressinform./Chermetinformatsiya, Ser. 6, No. 4 (1978).

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Authors and Affiliations

  1. Eastern Refractory Institute, USSR

    N. I. Abramova, V. Ya. Grinberg, S. V. Zhebrunov, A. S. Gninenko, V. F. Afanas'ev, T. S. Braslavskaya & M. Z. Naginskii

  2. Scientific-Research Institute for Metallurgy, USSR

    N. I. Abramova, V. Ya. Grinberg, S. V. Zhebrunov, A. S. Gninenko, V. F. Afanas'ev, T. S. Braslavskaya & M. Z. Naginskii

  3. Pervouralsk Dinas Plant, Chelyabinsk Metallurgical Combine, USSR

    N. I. Abramova, V. Ya. Grinberg, S. V. Zhebrunov, A. S. Gninenko, V. F. Afanas'ev, T. S. Braslavskaya & M. Z. Naginskii

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  1. N. I. Abramova
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  2. V. Ya. Grinberg
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  3. S. V. Zhebrunov
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  4. A. S. Gninenko
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  5. V. F. Afanas'ev
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  6. T. S. Braslavskaya
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  7. M. Z. Naginskii
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Additional information

Translated from Ogneupory, No. 11, pp. 53–56, November, 1986.

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Abramova, N.I., Grinberg, V.Y., Zhebrunov, S.V. et al. An evaluation of the effectiveness of use of hot tops. Refractories 27, 661–664 (1986). https://doi.org/10.1007/BF01387225

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  • DOI: https://doi.org/10.1007/BF01387225

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