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Damage caused by helium generated from decay of tritium is a distinctive effect that occurs in addition to the hydrogen isotopes protium and deuterium. The handbook defines the scope of our current knowledge of hydrogen effects in stainless steels and serves as a guide to selection of stainless steels for service in hydrogen.
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Hydrogen embrittlement occurs in a number of forms but the common features are an applied tensile stress and hydrogen dissolved in the metal. Examples of hydrogen embrittlement are cracking of weldments or hardened steels when exposed to hydrogen-rich environments. Hydrogen embrittlement does not affect all materials equally.
Effects of nitrogen on hydrogen embrittlement in AlSl type ...
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Hydrogen embrittlement of 316L type austenitic stainless steel has been studied by charging thin tensile specimens (0.2 mm thick) with hydrogen through cathodic polarization. The effects of hydrogen on the phase transition and the relative role of the metallurgical variables is discussed.
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Hydrogen diffuses into type 321 stainless steel and requires  only 74 w.ppm hydrogen for hydride embrittlement at room temperature. In fact, at operating temperatures of 500600o C for long term, hydrogen diffusion rates would be high and hydriding effects, if any, will be annealed out. Also, any martensitic phase and its effects on buy ss 321 hydrogen embrittlement
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SCC - Stress Corrosion Cracking of Stainless Steel
300 series austenitic stainless steels (SS), such as types 304 (UNS S30400), 316 (S31600), and their low-carbon forms, types 304L (S30403) and 316L (S31603). This diagram (Figure 1) is analogous to a similar diagram for caustic embrittlement of carbon steel un- der stress from welding or cold- forming.
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The effects of a hydrogen gas environment on the fatigue characteristics of a type 304 austenitic stainless steel were investigated and the following results were obtained. The hydrogen effect is not clearly seen by judging fatigue life diagram. However, crack initiation retards and crack propagation accelerates in hydrogen gas environment.
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