Table 2. Susceptibility to hydrogen embrittlement of candidate materials
| Materials | Position | Evaluation of hydrogen-charged materials | Fatigue life (in hydro- gen gas) |
||||||||
| Tensil strength |
Elongation and reduction of area |
Charpy absorbed energy |
Fracture toughness |
Fatigue life (in air) |
|||||||
| RT | 4K | RT | 4K | RT | 4K | RT | 4K | RT | RT | ||
| S304L (Fe-18Cr-8Ni) H : 30ppm |
Base metal |  |
|
 |
|
|
|
|
|
|
|
| Weld metal | |
|
|
|
|
|
 |
|
|
|
|
| S316L (Fe-17Cr-12Ni-2Mo) H : 30ppm |
Base metal | |
|
|
|
|
|
|
|
|
|
| Weld metal | |
|
|
|
|
|
|
|
|
|
|
| A5083 (Al-5Mg) H : 1ppm |
Base metal | |
|
|
|
|
- | |
|
|
|
| Weld metal | |
|
|
|
|
- | |
|
|
|
|
| H : hydrogen content |
| Decline in properties after hydrogen chargning (350 °C , 9Mpa) | |||
|
less than 20% | ||
|
20% to 50% | ||
|
more than 50% | ||
| - | Occurrence of hyf\drogen embrittlement unknown due to small ariginal values avaiable | ||