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Vol.40, No.3, 345 ~ 353, 2002
Title
Research Papers / Pyrometaliurgy : The Effect of Ti and Nb on Nitrogen Dissolution Reaction in Stainless Steel Melt
장민환Min Whan Jang,홍인국In Kook Hong,박종진Jong Jin Park,송효석Hyo Seok Song,이용득Yong Deuk Lee
Abstract
A kinetic study of nitrogen dissolution in STS304 stainless steel melt containing Ti and Nb has been carried out at 1500℃ using an induction furnace and a levitation melting furnace. At low O and S levels, the nitrogen dissolution rate showed the first-order kinetics being controlled by the mass transfer of nitrogen in the melt. Ti addition to STS304 stainless melt significantly retarded the nitrogen dissolution rate by the formation of solid Ti oxide layer adhered on the melt surface. Nb did not affect the rate of nitrogen dissolution. In the levitation melting experiment where the oxide layer was removed from the melt surface, Ti did not retard the nitrogen dissolution rate. Simultaneous addition of Ti and Al increased the dissolution rate by the formation of non-wetting A1_20_3 on the melt surface. A small addition of CaO-Al_2O_3 synthetic flux to Ti containing melt was very effective to remove the oxide layer, hence to increase the nitrogen dissolution rate.
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