By using mass spectroscopy, the H permeability of Fe at 760C was found to be equal to 7.0 x 10-5cm2/s atm½, while the diffusivity was equal to 2.0 x 10-4cm2/s.

J.I.Zvezdin, J.I.Belyakov: Fiziko-Khimicheskaya Mekhanika Materialov, 1967, 3[3], 349-51