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.
Test
Temperature
|
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 |