The permeability was measured for pressure differentials ranging from 10-3 to 104Pa at 350 to 1050K (table 119). For each alloy, a square-root dependence of permeability upon the pressure was observed at higher pressures. The pressure at which this relationship no longer applied depended upon the H purity.

Hydrogen Permeation Characteristics of Some Austenitic and Nickel-Base Alloys. E.H.Van Deventer, V.A.Maroni: Journal of Nuclear Materials, 1980, 92[1], 103-11

Table 118

Diffusivity of D in Various Alloys