Patent Number: 049901834
Section: description

EXAMPLE 1: Flow of gaseous argon (stirring) : 6 Nm3/h Flow of liquid argon : 2.6 1/min. Ladle : 50 metric tons Grade of steel : steel containing less that 100.times.10-3% of carbon and a small quantity of silicon and manganese. Treatment time : 95' Intake of nitrogen : with liquid argon : +4 ppm without liquid argon : +10 ppm EXAMPLE 2: The conditions of treatment are identical to those of Example 1, but a wire filled with CaSi is introduced in the course of the treatment. Rate of introduction of the CaSi wire : 0.5 to 2 m/s (N.sub.2) start of the treatment : 98 ppm (N.sub.2) end of the treatment 85 ppm N.sub.2 =-13 ppm EXAMPLE 3: Flow of gaseous argon (stirring) 12.7 Nm3/h Flow of liquid argon : 6,2/min. Ladle : 50 metric tons Quantity of metal : 49 metric tons ______________________________________ Quantity of metal 49 metric tons Grade of steel C Si Mn 10 - 3% &lt;100 &lt;700 &lt;1000 ______________________________________ Treatment time : 25' Nitrogen Pick-up : with liquid argon : +3 ppm without liquid argon : +8 ppm