[MW:31877] E316L -15for Type 304L SS welding -cryogenic services

Experts

Below  requirement given in one LNG project... 

Welding Consumables:

1. SMAW Consumables for Type 304L Stainless Steel Impact Tested at -196°C (-320°F).

Consumable:

ASME Specification SFA 5.4 in Part C, Section II Material Specification

- AWS Classification E316L-15

Certification and Testing:

ASME Specification SFA 5.01 in Part C, Section II Material Specification

- Lot Classification - C5

- Level of testing - Schedule K

Testing Requirements for each Lot of electrode:

Each Lot of electrode shall be certified with the minimum following testing:

- Chemical analysis of weld metal to meet the requirements for classification E316L

except the maximum phosphorus shall be 0.03% and the maximum sulphur shall be

0.02%.

- Delta ferrite determination per paragraph A6.9 of SFA 5.4. The weld metal shall be

a maximum Ferrite Number of 2 FN.

- Charpy V-notch impact test shall be performed on the weld metal in accordance

with SFA 5.4, paragraph A9.3.1. The weld test assembly shall be prepared and

welded with CVN specimens removed as per paragraph A9.3.5 of SFA 5.4. Five

impact specimens shall be tested at -196°C (-320F). The lowest and highest values

obtained shall be disregarded. The three remaining values shall be equal to, or

exceed, 20 mils of lateral expansion. The energy in ft-lbs and the percent ductile

fracture areas shall be reported for information.

Question

1) what is the technical  Reason behind for E316L -15 for Type 304L SS welding  SMAW process -cryogenic , however for GTAW process ER308L specified for Type 304L welding.  

Regards

sudhakar

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