Transport of hydrogen and deuterium in 316LN stainless steel over a wide temperature range for nuclear hydrogen and nuclear fusion applications

Abstract The permeation of hydrogen and deuterium through 316LN stainless steel (316LN SS) was investigated over a wide temperature range of 300–850 °C for nuclear hydrogen and nuclear fusion applications. We presented the first complete datasets of permeability Φ, diffusivity D, and solubility S for both hydrogen (H) and deuterium (D) in 316LN SS. ΦH and ΦD were 3.47 × 10−7exp(−66.6 × 103/RT) and 2.71 × 10−7exp(−67.5 × 103/RT) mol·m−1 s−1 Pa−0.5, respectively. DH and DD were 15.9 × 10−7exp(−56.5 × 103/RT) and 13.8 × 10−7exp(−56.8 × 103/RT) m2∙s−1, respectively. The estimated isotope effect ratios of ΦH/ΦD, DH/DD, and SH/SD were ~1.4, ~1.2, and ~1.2, respectively. The previously reported results for 316LN SS were extrapolated to the temperature range used herein and were compared with the results of this study. Although some discrepancies were observed between the results of this study and previous studies, they were within the acceptable scattering range.