Use of argon to prepare low-carbon, low-nitrogen steels in...

Details Use of argon to prepare low-carbon, low-nitrogen steels in... Use of argon to prepare low-carbon, low-nitrogen steels in...

C - Chemistry, Metallurgy

21

C

53/87

C21C 5/32 (2006.01)

Patent

CA 1107971

ABSTRACT The nitrogen content of low carbon steel made by the basic oxygen process is minimized by: (a) introducing nitrogen-free fluid into the vessel before the nitrogen content of the melt has reached its minimum level, (b) adjusting the flow rate of the nitrogen-free fluid to maintain total off-gas flow rate at least equal to that which would have been produced without the nitrogen- free fluid at the time in the refilling process when the nitrogen content of the melt reached its minimum level, and (c) the injection of nitrogen-free fluid throughout the remainder of the oxygen blow. A preferred additional or alternatively separate step involves minimizing the nitrogen content of BOP steel by purging the vessel headspace with a nitrogen- free fluid prior to reblows.

288670

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