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Role of Direct Reduced Iron Fines in Nitrogen Removal from Electric Arc Furnace Steel
Author(s) -
Pal J.,
Ghosh S.,
Goswami M. C.,
Singh D. P.,
Kumar Manoj,
Minj R. K.,
Upadhyay A. K.
Publication year - 2007
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200706253
Subject(s) - nitrogen , electric arc furnace , metallurgy , materials science , electric arc , carbon steel , carbon fibers , nitrogen gas , composite material , chemistry , electrode , corrosion , organic chemistry , composite number
Electric arc furnace steel contains about 70‐120 ppm nitrogen. There is no suitable method for nitrogen removal from electric arc furnace steel up to the level desired for good quality bars and flat rolled products (30 ppm max). The existing process based on vacuum degassing can remove only up to 20% of nitrogen in steel. In the present study DRI fines have been injected into a steel bath which can drift out nitrogen in steel through production of fine CO bubbles in‐situ on reaction with residual FeO in DRI fines and C in bath. For high and medium carbon steel, nitrogen got reduced to 30 ppm and 60 ppm respectively where initial nitrogen was 150 – 200 ppm in steel. Nitrogen removal also depends upon bath depth and addition level of DRI.