Wyniki wyszukiwania - BazTech

1

The influence of slenderness ratios of multi- hole ceramic filters from λ = 1.67 to λ = 8.36 of filter surface on efficiency of liquid steel refining from solid non metallic inclusions

Janiszewski K.

Journal of Achievements in Materials and Manufacturing Engineering

|

2012

|

Vol. 55, nr 2

410--415

EN

Purpose: I propose in this publication to introduce the additional, standardized conception, characterizing the filters used in research works (already known in metallurgy in definitions of forms of the ingot moulds) - the filter slenderness ratio. Design/methodology/approach: In order to confirm the theoretical assumptions we have performed a series of the laboratory scale experiments (for the filter slenderness ratio SF1 λ = 1.67 and SF2 λ = 8.36). Findings: The influence of the filter slenderness on the filtration process efficiency has been determined through variations in quantities and surface shares of the non-metallic inclusions in the filtrated steel in relation to the non-filtered steel. We present also the results of researches on the separating surfaces between the liquid steel and the ceramic filter material, which in form of photos and scanning microscope microanalyses are put together in the publication. Research limitations/implications: The aim of the research carried out has been to prove that the liquid steel filtration is a cheap and efficient additional processing stage, separating the non-metallic inclusions, which in case of the conventional casting technology could remain in the cast steel bodies. Practical implications: The research results presented in the paper can be used for steel production of high purity steels. Originality/value: The goal of the research carried out, the results of which are presented here, has been to prove the possible extent of the solid non-metallic inclusion removal from liquid steel through the steel filtration by means of multiple-orifice ceramic filters. These inclusions most frequently throw into confusion the process of continuous casting d inclusion deposits formed on the walls of the submersion-type nozzles, which gradually reduce the nozzle cross-section (which cause nozzle accretion).

2

Influence of slenderness ratios of a multi-hole ceramic filters at the effectiveness of process of filtration of non-metallic inclusions from liquid steel

Janiszewski K.

Archives of Metallurgy and Materials

|

2012

|

Vol. 57, iss. 1

135-143

EN

The paper presents the results of investigations of the process of filtration of solid non-metallic inclusions from liquid steel with use of multi-hole ceramic filters (filtrating surfaces) characterised by a varying slenderness ratios. In order to eliminate the negative influence of the ambient air atmosphere the investigations have been carried out under a protective argon atmosphere. The experimental results obtained have proved earlier suggestions of papers [9-12] about the negative influence of ambient air atmosphere, as well as the essential influence of slenderness ratio of the used multi-hole ceramic filter at the increase of effectiveness of the liquid steel refining processes carried out through steel filtration.

PL

W pracy przedstawiono wyniki badań procesu rafinacji ciekłej stali z stałych wtrąceń niemetalicznych przy pomocy wielootworowych filtrów ceramicznych charakteryzujących się zmienną smukłością (powierzchnią filtracyjną). W celu wyeliminowania negatywnego wpływu otaczającej atmosfery powietrza badania przeprowadzono w atmosferze ochronnej argonu. Otrzymane wyniki eksperymentów potwierdziły wcześniejsze sugestie autorów prac [9-11, 15] o negatywnym wpływie otaczającej atmosfery powietrza jak również istotnym wpływie smukłości stosowanych wielootworowych filtrów na wzrost skuteczność rafinacji ciekłej stali poprzez jej filtrację.

3

Wpływ powierzchni filtracyjnej na skuteczność rafinacji ciekłej stali ze stałych wtrąceń niemetalicznych

Janiszewski K.

Hutnik, Wiadomości Hutnicze

|

2011

|

Vol. 78, nr 2

169-173

PL

Artykuł przedstawia wyniki badań procesu rafinacji ciekłej stali ze stałych wtrąceń niemetalicznych za pomocą wielootworowych filtrów ceramicznych. Badania przeprowadzono w atmosferze ochronnej argonu. Podczas eksperymentu stosowano wielootworowe filtry ceramiczne charakteryzujące się zróżnicowaną smukłością (powierzchnią filtracyjną).

EN

The article presents the results of testing the process of liquid steel filtration from solid non metallic inclusions with multi-hole ceramic filters, conducted in the protective atmosphere of argon. Multi-hole ceramic filters of different slenderness ratio were used in the experiment. These results have been compared with the results of the previous tests conducted in the surrounding atmosphere of air.