phone-icon800.354.0806
765.456.6012
The Home of HASTELLOY® and
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

Print Page
Back to top