The flow of H through this steel was strongly affected by surface reactions. An experimental investigation which was based upon pressure modulation techniques showed that macroscopic flow could be described by:

D (m2/s) = 7.3 x 10-7 exp[-6300/T]

D.M.Grant, D.L.Cummings, D.A.Blackburn: Journal of Nuclear Materials, 1988, 152, 139-45