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Hydrogen Embrittlement

Notched tensile tests performed in hydrogen and air reveal that 230® alloy is resistant to hydrogen embrittlement. Tests were performed in MIL-P-27201B grade hydrogen, with a crosshead speed of 0.005 in/min (0.13 mm/min). Specimens were notched with a KT value of 8.0.

Hydrogen Pressure Ratio of Notched Tensile
Strength, Hydrogen/Air
°F °C psig MPa -
70 21 3000 21 0.92
70 21 5000 34 1.07
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