The permeability and diffusivity of H in the stainless steels were measured by using a gaseous permeation technique at between 200 and 430C. The results indicated that the permeability and diffusivity obeyed Arrhenius relationships:

AISI316L:     D (m2/s) = 4.79 x 10-7 exp[-51.59(kJ/mol)/RT]

AISI316LN:     D (m2/s) = 4.33 x 10-7 exp[-50.99(kJ/mol)/RT]

and were not affected by cold-working or heat-treatment. The values were affected by the alloy composition.

X.Sun, J.Xu, Y.Li: Materials Science and Engineering, 1989, A114, 179-87