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Austenitic stainless steel is widely used as material for high pressure industrial gas equipment and piping, on account of its cold-workability and high corrosion resistance. The representative types of austenitic stainless steel are Type304 (UNS S30400) SS and Type316L (UNS S31603) SS. While there is a problem with the anti-corrosive strength of weld heat-affected zones in a chloride solution, Type304SS has the advantages of being less expensive and of having more strength after cold-working than Type316LSS. Due to concerns about hydrogen embrittlement1) of Type304SS, however, Type316LSS is more often used as material for hydrogen gas equipment. Mechanical properties of Type304SS deteriorate greatly in room temperature hydrogen gas.2–5) For example, the percentage elongation after fracture of Type304SS in room temperature hydrogen gas of 75 MPa decreases to around 30% of that in air5) while the percentage elongation after fracture of Type316LSS in the same hydrogen gas is equal to that in air.2) As Type304SS is semi-stable austenitic stainless steel, its austenitic phase (γ phase) areas are transformed into strain-induced martensitic phase (α’ phase) when exposed to strong plastic deformation strength. It is considered that the embrittlement of Type304SS in hydrogen gas is caused by interactions between hydrogen and transformed areas, including α’ phase section, formed in Effect of Hydrogen Partial Pressure on the Hydrogen Embrittlement Susceptibility of Type304 Stainless Steel in Highpressure H2/Ar Mixed Gas

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Effect of Hydrogen Partial Pressure on the Hydrogen Embrittlement Susceptibility of Type304 Stainless Steel in High-pressure H&lt;sub&gt;2&lt;/sub&gt;/Ar Mixed Gas