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HAYNES® Alloys

Resistance to Hydrogen Embrittlement

Notched room-temperature tensile tests performed in hydrogen and air reveal that 242 alloy is roughly equivalent to alloy 625 in resisting hydrogen embrittlement, and appears to be superior to many important materials. Tests were performed in MIL-P27201B grade hydrogen, with a crosshead speed of 0.005 in./min. (0.13 mm/min.).

 
Alloy
Hydrogen
Pressure
- Ratio of Notched Tensile
Strength, Hydrogen/Air
psi MPa Kt
Waspaloy 7,000 48 6.3 .78
625 5,000 34 8.0 .76
242® 5,000 34 8.0 .74
718 10,000 69 8.0 .46
R-41 10,000 69 8.0 .27
X-750 7,000 48 6.3 .26

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