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0221U104731,
0120U103401
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Mastering of production technology of corundum spinel plugs with using of aluminum-magnesia-chromite spinel for bottom blowing of metal in steel ladles and pilot batches out put of refractory products for steel ladles
Zolotuhina Ludmyla M.,
06-04-2021
Joint Stock Company "The Ukrainian Research Institute of Refractories named after A. S. Berezhnoy"
The research object is bottom purge plugs for gas treatment of metal in steel ladles. The work purpose is mastering of production technology of corundum-spinel (CS) plugs with using of alumina-magnesia-chromite spinel (AMChS) for bottom blowing of metal in steel ladles. The research methods are chemical, petrographical, X-ray, physicomechanical ones. The production technology of a new type of products — CS with using AMChS purge plugs was mastered. These products were characterized by the following properties: wt. %: Al2O3 — 91.20 %, MgO — 3.48 %, Cr2O3 — 3.64 %; Fe2O3 — 0.21 %; open porosity 16.9 — 17.0 %; apparent density 3.23 g/cm3; CCS 209 — 229 N/mm2. An influence of coarse-grained component of charge and moisture content on flowing and properties of green and CS samples after firing at 1580 °C was studied. It was estab-lished that, the most optimal properties (open porosity 14.3 %, apparent density 3.33 g/cm3 and CCS 365 N/mm2) were characterized by samples made of a charge with a coarse-grained component of the established optimal grain composition. Tests of ladle glasses at vacuum pouring of carbon steel at one of the machine-building enterprises of Ukraine showed that, the glass provides continuous pouring from 240 to 450 tons of steel at temperatures of 1580—1650 °C, wear of the steel-pouring channel diameter did not exceed 3—5 mm, due to the formation on contact with the steel melt "strips" of spinel up to 0.2 mm wide, which inhibits the melt penetration into the refractories and prevents its wear. As a result of the carried out researches the domestic CS ladle glass was developed. In JSC “The URIR named after A.S. Berezhnoy” pilot batches of purge plugs and CS ladle glass were produced. Properties of these products meet the requirements of technical conditions. The work should be continued in the direction of improving technology, as well as expanding production and application of purge plugs and ladle glass
Tkachenko Lyudmyla P.
Shulik Iryna G.
2021-04-06
Updated: 2025-12-13
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