The effect of gas bubble size

injection rate and blowing time on removal of hydrogen and inclusion in liquid steel during refining has been studied and analyzed by theory calculation. A large number of bubbles form in liquid steel as the argon gas injection through porous brick. Small bubbles are available to increase the degassing area in liquid steel and favorable to decrease hydrogen content in steel. Inclusion adhering to bubble then going up is an effective way to remove the inclusions

and the smaller the bubbles and the larger the inclusions

the easier to remove the inclusions from liquid steel. During la祖e refining

it is available to remove the hydrogen and the inclusions in liquid steel by small injecting bubbles

and the optimum bubble diameter is 1 ~ 3 mm.