Hydrogen balance

Rate of hydrogen removal from steel rate at which hydrogen is transferred in vacuum 
If weight of steel is m in tones, t is time in minutes and ppmH is hyd

                                (10)

                                     (11)

R is circulation rate in tone /min, and    is hydrogen concentration at equilibrium.
By 10 and 11

                                                                      (12)

Integrating equation 12 and using boundary conditions

                                                                (13)

                                                                      (14)

In lecture 30, some problems related to degassing are discussed 

References:

• A. Ghosh: Principles of secondary processing and casting of liquid steel.
• A. Ghosh: Secondary steelmaking