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    EVALUATION OF PRODUCT SINTER QUALITY IN BLENDS PREPARED WITH DOMESTIC AND IMPORTED FINE ORES AT KARDEMIR
    (Baski, 2022) Timur, T.; Cantürk, C.; Esin, F.; Acur, O.; Sevim, M.; Sun, Y.
    In Integrated Iron and Steel Plants, fine ores of a size that cannot be charged directly to the blast furnaces are combined by subjecting to surface melting under the melting temperature. As a result of sintering, it becomes usable in blast furnaces. Sinter is the most economical ferrous material input of blast furnaces. Blast furnaces production speed, efficiency, quality and economy of the product obtained depend on the raw materials used. In this study, the quality of the product sinter obtained by blending domestic and imported fine ores in different proportions was evaluated. Physical (sieve analysis) and chemical (XRF) properties of the blend were determined by taking samples from the blend area to represent each blend. Blends has been categorized and sintered as domestic and imported fine ore, calibrated ore, pellet dust and other (waste dusts of some plant). Physical (sieve analysis, drum test), chemical (XRF) and metallurgical analysis (RUL, RDI) of the obtained sinters were made. When all analysis results were examined, it was concluded that the most suitable mixture for sinter used in blast furnaces would be provided using at least 30% imported ore. © IMCET 2022. All rights reserved.
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    IMPROVEMENT OF SIEVE PANELS USED IN BURNT LIMESTONE SCREENING SYSTEM AT KARDEMIR A.Ş. LIME PLANTS
    (Baski, 2022) Nakas, E.; Cantürk, C.; Esin, F.; Acur, O.; Sevim, M.; Gökkaya, H.
    Nowadays, industrial factories attach great importance to suggestions and improvement studies in their facilities in order to reduce production costs and increase their competitiveness. Approximately 1.9 billion tons of steel is produced every year in the world and 60% of this amount is obtained from blast furnaces. Burnt limestone is used to remove impurities in the liquid steel during the steel production process of KARDEMİR A.Ş. integrated iron and steel factory. The size of burnt limestone over 50 mm is important for homogeneous dissolution in liquid steel. The breaks in the steel-based sieve panels used in the sizing of the burnt limestone cause the burnt limestone not to be dimensioned properly and cause negativity on the production stops, occupational health and safety issues. In this study, instead of steel based sieve panels, rubber based sieve panels with the same sizing area are used. Along with the improvement made by using rubber-based sieve panels, the production stops caused by the break and break in the panels during the sizing process of burnt limestone, occupational health and safety risks experienced during the replacement of sieve panels were prevented. © IMCET 2022. All rights reserved.
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    Investigation of corrosion properties of box boring din 20MnCr5 steel bars
    (EDP Sciences, 2023) Sahin, N.; Isikgül, A.; Ziyamukhamedova, U.; Ahlatci, H.; Acarer, M.; Sevim, M.
    In this study, boriding process was carried out on ? 11 mm diameter DIN 20MnCr5 quality steel bars, used in chain elements such as links and rings, and fasteners such as bolts, at 950oC boronizing temperature, boriding times of 2.5 and 7.5 hours. In this study, the formation and growth of the boride layer and the metallographic structure, the coating thickness and corrosion properties of the boronized steels were investigated depending on the boriding conditions. In the box boriding process, Ekabor-II powder mixture, with its commercial name, was used as boriding powder. According to the optical microstructure results made as a result of box boriding, the coating thickness was 371.5 ?m in the ? 11 mm diameter boronized DIN 20MnCr5 steel bar for 7.5 hours boriding times while it was 195.6 ?m in that steel bar for 2.5 hours boriding times. Corrosion experiments were carried out in solutions prepared by adding 3.5% NaCl to distilled water. According to the results of the immersion test, the lowest corrosion rate in mdd was measured as 112 mg/(dm2 x day) in the ? 11 mm diameter, 7.5 hour boronized sample, and the highest corrosion rate in mdd was 1456.75 mg/(dm2 x day) in the untreated ? 11mm diameter sample. In the potentiodynamic polarization test, parallel results were obtained for immersion corrosion. Corrosion rate values (icor) were measured at the highest value of 209 x 10- 6 A/cm2 in the untreated ? 11 diameter sample, while the lowest icor value was 0.0039 x 10- 6 A/cm2 in the ? 11 mm diameter sample borided for 7.5 hours. © 2023 EDP Sciences. All rights reserved.