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2205 duplex stainless steels have been used for the construction of the marine environment, because of
their excellent corrosion resistance and high strength. However, the resistance to hydrogen embrittlement
(HE) may be less than that of 316L austenitic stainless steel. The reason why 316L stainless steels have
better resistance to HE is associated with crystal structure (FCC, face centered cubic) and the higher stacking
faults energy than 2205 duplex stainless steels. Furthermore 2205 stainless steels with or without tungsten
were also examined in terms of HE. 2205 stainless steels containing tungsten is less resistible to HE. It
is because dislocation tangle was formed in 2205 duplex stainless steels. Slow strain-rate tensile test (SSRT)
was conducted to measure the resistance to HE under the cathodic applied potential. Hydrogen embrittlement
index (HEI) was used to evaluate HE resistance through the quantitative calculation.
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