14 KB360 KB11 KB200020242012Adolf, ZdeněkJurča, Jakubštevilka:3letnik:46str. 287-290ISSN:1580-2949COBISSID:934570URN:URN:NBN:SI:doc-6BRQP2ELenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijecalciuminclusionsjeklokalcijmodificationmodifikacijesteelvključkiEvolution of the number and size of the inclusions during steel treatment in a ladle furnace and in a vacuum caisson| Število in velikost vključkov, nastalih pri obdelavi jekla v ponovčni peči in vakuumski komori|The production of higher steel grades, such as steel for pipelines, requires monitoring the content of inclusions in the steel. Hence, the steelmakers have to choose suitable technological procedures that ensure the highest purity of the steel. Purpose of this work was to observe the evolution of the inclusions in the steel during its refining in a ladle furnace and in a vacuum caisson. For this purpose the samples of steel were taken at various stages of the processing. In one half of the melts the steel was deoxidised by CaSi-cored wire in a ladle furnace so that it would be possible to observe the influence of the CaSi on the occurrence of inclusions after degassing in the caisson. All the heats were processed in the following technological flow: OBM converter - ladle furnace - vacuum caisson (ISSM) - continuous castingProizvodnja kakovostnejših jekel, kot so jekla za cevovode, zahteva tudi kontrolo vsebnosti vključkov. Zato se pri izdelavi jekla izberejo ustrezni tehnološki postopki, ki zagotavljajo visoko čistost jekla. Namen tega dela je bil ovrednotenje nastanka vključkov v jeklu med rafinacijo v ponovčni peči in vakuumski komori. V ta namen so bili vzeti vzorci v različnih fazah procesa. Polovica taline je bila dezoksidirana z oplaščeno žico CaSi v ponovčni peči z namenom raziskave vpliva CaSi na nastanek vključkov po razplinjenju v komori. Vse taline so bile izdelane po naslednjih tehnoloških postopkih: OBM konverter-ponovčna peč-vakuumska komora (ISSM)-kontinuirno litjeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije