In order to qualify 316 LN modified stainless steel for superfluid Helium cryogenic application in the frame of the Large Hadron Collider (LHC) development in the CERN – Genova, low temperature material and weldments evaluation has been carried out.

The evaluation program hereafter presented includes :

1. Description of the project requirements and objectives .
2. Plate material characteristics – Austenite stability.
3. Welding test.
4. Fracture safety assessment.

Conclusion