Effect of Stirring Practice on Sulphur and Nitrogen Refining as well as Inclusion Removal in Ladle Treatment

Publisher: John Wiley & Sons Inc

E-ISSN: 1869-344x|86|12|1498-1507

ISSN: 1611-3683

Source: STEEL RESEARCH INTERNATIONAL, Vol.86, Iss.12, 2015-12, pp. : 1498-1507

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Abstract

The effect of different stirring conditions during ladle treatment on the steel cleanliness was studied in the steel plant of SSAB Special Steels in Oxelösund, Sweden. The cleanliness was examined with regards to the contents of sulfur, nitrogen, and large inclusion (>10 μm). The results showed that vacuum degassing increased the amount of inclusions larger than 10 μm and that subsequent induction stirring suggested a possible positive effect on the inclusion removal. A shortening of the vacuum degassing time from 24 to 15 min did not affect the nitrogen or sulphur refining. Overall, all heats reached the desired composition and cleanliness levels regardless of the treatment time.