2002 Volume 88 Issue 5 Pages 243-248
The rate of hydrogen desorption from liquid steel bath was measured to investigate the effect of pressure. Experiments of hydrogen desorption from molten steel were conducted using 30kg and 100kg scale induction furnace. Hydrogen desorption reaction was basically controlled by gas phase mass transfer over 1.4 kPa in this experimental condition. The effect of argon gas top blowing on to the free surface of molten steeel bath on the gas phase mass transfer coefficient was evaluated. Following dimensionless equation was obtained, assuming 0.33 power of Sc.
where H is the distance between free surface of melt bath and nozzle, dn, is inner diameter of nozzle, dc is inner diameter of crucible, Sh= kGdn/D Ar-X, Re=ugdn/ vg, Sc = Vg/DAr-X, kG is mass transfer coefficient of gas phase, DAr-X is diffusion coefficient of diffusing gas, ug is gas velocity, vg is kinetic viscosity of gas.