Institute of Metallurgy — Ural Branch of the Russian Academy of Sciences (Ekaterinburg, Russia):

Zalazinskiy G. G., Dr. Eng., Senior Research Fellow, e-mail: zalaz45@mail.ru
Shchennikova T. L., Cand. Eng., e-mail: tatleon@mail.ru

The results of investigations in the fi eld of dispergating of steel melts (containing carbon as much as 0.4–0.8 mass. %) using flat-die nozzle are presented. As a result, the conditions of quenching of shot particles from so-called "casting heat" has been established. It allowed to get particles' macrostructure of tempered martensite with bainite after shot tempering at 570–620 K as well as to improve product quality. At the second stage of investigations they used a disperser providing creation of divergent flow of energy carrier due to simultaneous feed of water and air. Control of water-air proportion in their consumption allowed to choose optimal conditions of obtaining particles with preset size and their cooling. This nozzle block was used in shot production, while shot is alloyed simultaneously by copper and molybdenum. Examination of shot wear resistance has shown that introduction of these additives allowed to obtain steel shot with quality comparable with the best foreign samples. Based on the results of these investigations, the resource-saving technology for steel shot production with advanced quality as well as the technological line for putting this technology into practice are suggested. This technology includes the following operations: metal preparation, Cu and Mo alloying, melt dispergation, with water and air feed and additional cooling of particles, shot water cooling, tempering and divergence of particles to separate fractions.

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2. Zalazinskiy G. G., Shchennikova T. L., Zalazinskiy G. G. (jr.). O gidrodinamicheskom aspekte dispergirovaniya zhelezouglerodistykh rasplavov (About hydrodynamic aspect of dispersion of iron-carbon melts). Rasplavy = Melts. 2000. No. 4. pp. 49–54.
3. Romanov A. A., Krashaninin V. A., Vatolin N. A. et al. Osobennosti kristallizatsii dispergirovannykh zhelezouglerodistykh rasplavov (Peculiarities of crystallization of dispersion iron-carbon melts). Rasplavy = Melts. 2004. No. 6. pp. 3–11.
4. Zalazinskiy G. G., Zalazinskiy G. G. (jr.), Shchennikova T. L., Romanov A. A., Krashaninin V. A. Dinamicheskie osobennosti dispergirovaniya zhelezouglerodistykh rasplavov (Dynamic peculiarities of dispersion of iron-carbon melts). Rasplavy = Melts. 2005. No. 4. pp. 22–27.
5. Zalazinskiy G. G., Shchennikova T. L., Romanov A. A., Krashaninin V. A. Sposob polucheniya stalnoy drobi (Method of obtaining of steel shot). Patent RF, No. 2289495. Applied: March 03, 2005.
6. Zalazinskiy G. G., Shchennikova T. L., Kolobanov A. G. Ustanovka dlya polucheniya metallicheskoy drobi (Unit for obtaining of steel shot). Patent RF, No. 225147. Applied: December 15, 2003.
7. Zalazinskiy G. G., Leontev L. I., Shchennikova T. L. Vliyanie dobavok medi i molibdena na mikrostrukturu i mekhanicheskie svoystva stalnoy drobi (Infl uence of copper and molybdenium additions on microstructure and mechanical properties of steel shot). Metally = Metals. 2007. No. 4. pp. 27–32.
8. Zalazinskiy G. G., Shchennikova T. L., Leontev L. I., Kolobanov A. G. Stalnaya litaya drob (Steel cast shot). Patent RF, No. 2406777. Applied: April 06, 2009.
9. Zalazinskiy G. G., Shchennikova T. L., Zalazinskiy A. G., Kolobanov A. G. Tekhnologicheskaya liniya po proizvodstvu metallicheskikh granul (Technological line on production of metalluic granules). Patent RF, No. 120592. Applied: May 10, 2012.