Abstract
Phosphorus must be reduced to less than 20ppm for the products subject to hydrogen resistance and other hostile environments. The current dephosphorization process in converter has not reached this level. In this study, the dephosphorization slag with ultra-high Lp was studied, and the kinetic conditions of dephosphorization reaction were optimized too. The industrial production was carried out in a 200t converter in Shougang Jingtang, and the production process was ‘KR-BOF-LF-VD-CC'. By the double slag process in converter, phosphorus contents were reduced to 3.8-11.0ppm in one casting consequence of 10 heats, and the average phosphorus was 7.3ppm. The average tap to tap time was 42min. This technology was successfully applied in the production of 9Ni steel, acid resistant steel and hydrogen resistant steel. 53800 tons of ultra-low phosphorus molten steel have been successfully produced.
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