The diffusivity of H in the stainless steel was measured by using a gaseous permeation technique at 200 to 430C. the data obeyed an Arrhenius relationship,

D (cm2/s) = 6.33 x 10-3 exp[-54.99(kJ/mol)/RT]

and were not affected by cold-working and heat-treatment.

X.Sun, J.Xu, Y.Li: Materials Science and Engineering A, 1989, 114, 179-87