Role of direct reduced iron fines in nitrogen removal from electric arc furnace steel

Pal, J and Ghosh, S and Goswami, M C and Singh, D P and Kumar, Manoj and Minj, R K and Upadhyay, A K (2007) Role of direct reduced iron fines in nitrogen removal from electric arc furnace steel. Steel Research International, 78 (8). pp. 588-594.

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Abstract

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.

Item Type:Article
Official URL/DOI:http://apps.webofknowledge.com/full_record.do?prod...
Uncontrolled Keywords:arc furnace; steel; nitrogen; DRI fines; injection
Divisions:Metal Extraction and Forming
ID Code:3457
Deposited By:Mr. G Shailendra Kumar
Deposited On:19 Jul 2011 11:40
Last Modified:06 Feb 2012 17:25
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