A study was made of the diffusion of H by using a Sieverts cell at a H partial pressure of 1atm. It was found that the diffusivity, at temperatures of between 1222 and 1528C, depended upon the phase:

γ:     D (cm2/s) = 2.9 x 10-3 exp[-7.68(kcal/g-atom)/RT]

δ:     D (cm2/s) = 2.88 x 10-1 exp[-22.35(kcal/g-atom)/RT]

H.Schenck, K.W.Lange: Archiv für Eisenhüttenwesen, 1966, 37[10], 809-12