| 摘要 |
<p>PURPOSE:To improve desulfurization efficiency remarkably, by using the first and second lances having specified shapes in cases molten steel is arc heated and stirred respectively. CONSTITUTION:The first lance 5 forming four bottom discharging holes 6 having discharging direction inclined by about 45 deg. angle to longitudinal direction of main body and turned in four directions radially from lower end part of main body, and the second lance 7 forming two discharging holes 8 having discharging direction crossing at right angle with longitudinal direction of main body and turned to opposite directions are provided to a ladle 1. Electrodes 4 are dipped in a slag 2 on a molten steel 2 in the ladle 1, arc is formed between the steel 2 and the electrodes 4 to arc heat the steel 2, the lance 5 is dipped into the steel 2, gas of low flow rate is introduced to stir the steel 2. After stopping arc heating,the lance 7 is dipped into the steel 2, gas of high flow rate is introduced to stir the steel 2.</p> |
