The diffusivity of H was determined as part of a study of H embrittlement. The results could be described by:

D (cm2/s) = 7.4 x 10-3 exp[-14.40(kcal/mol)/RT)

S.Nomura, M.Hasegawa: Transactions of the Iron and Steel Institute of Japan, 1980, 20[2], 215-22