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Evaluation of slag regime in ladle during utilization of briquetted synthetic slag in VHM a.s.

Socha L., Bazan J., Gryc K., Machovcak P., Opler A., Trefil A., Melecky J.

Archives of Materials Science and Engineering

2012

Vol. 57, nr 2

80--87

Purpose: The paper focuses on evaluation of slag regime by the help of synthetic slags based on Al2O3. The comparion of influence of synthetic slags on the production of two chosen grades of steels focused on evaluation of effectivity of created refining slag during treatment in the secondary metallurgy was the objective of plant experiments. Design/methodology/approach:During evaluation of slag regime in the ladle, steel samples for assessment of desulphurization degree were taken under the plant conditions. Slag samples were also taken for evaluation of chosen parameters: basicity, content of easily reducible oxides, proportion of CaO/Al2O3 and Mannesmann’s index. The temperature and oxygen activity in steel was continuously measured too. Findings: From plant experiments, it was found out that during using of two different types of synthetic slags during production of steel grades St52-3 and S34MnV similar values of desulphurization degree were achieved. Chosen parameters of ladle slag were monitored and it was demonstrated that the developed synthetic slag B reaches the results comparable with the standard used synthetic slag A. Research limitations/implications: Plant experiments were made under conditions of VÍTKOVICE HEAVY MACHINERY a.s. plant Obtained results are limited by the testing during production of two different steel grades St52-3, S34MnV and by the specific technology of production formed by EAF→LF→VD/VCD. Practical implications: The research results made it possible to realize the optimalization of slag regime under the plant conditions of VÍTKOVICE HEAVY MACHINERY a.s. plant. It was proved that developed synthetic slag B from the company JAP TRADING s.r.o. can adequately replace the common synthetic slag A. Originality/value:Results mentioned in this paper are intended for steel producers and they represent basic information about possibilities of slag regime optimalization in the ladle.

Modification of Slag in the Ladle by the Help of Briquetted Fluxing Agents

Socha L., Bazan J., Gryc K., Styrnal P., Pilka V., Piegza Z.

Hutnik, Wiadomości Hutnicze

2011

Vol. 78, nr 9

772--774

The paper presents results of influence of thinner additions into the steelmaking slag on steel desulphurization in the ladle. Comparison of effectivity of two developed briquetted thinners based on Al2O3 with the thinner in common used at the steelworks Třinecké železárny, a.s. was made.

W artykule przedstawiono wyniki badań wpływu dodatków upłynniacza żużla na odsiarczanie stali w kadzi stalowniczej. Przeprowadzono porównanie skuteczności dwóch rodzajów badanego, brykietowanego upłynniacza żużla na bazie Al2O3 z upłynniaczem powszechnie stosowanym w stalowni Třinecké železárny, a.s.

Nowy kierunek pozapiecowej rafinacji stali w odlewnictwie

Sadownik J. W., Rabinovitch A. V., Nefedov J. A.

Archiwum Odlewnictwa

2004

R. 4, nr 13

201--204

Przeanalizowano zalety nowej dla warunków odlewnictwa metody rafinacji pozapiecowej kąpieli. Zastosowanie konwertora rafinacji gazotlenowej (RGT) zapewnia wysoki poziom wskaźników jakości wyrobów końcowych oraz stosunkowo nieskomplikowany sposób ich uzyskiwania.

The article discusses advantages of novel method of secondary metallurgy for refinement of metals, which is new for conditions of foundry. The use of converter gas-oxygen refinement (GOR) provides to higher level of quality characteristics of finished products, as well as relatively simple method of achieving those characteristics.