E316L -15for Type 304L SS welding -cryogenic services

[sela]

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

[Vishwas Keskar]

Well! the reason behind E3016L -15 recommendation is :

SMAW = E306L -  15 - It has lower  FN and in turn  better Notch Toughness values at -196   Deg C .

- 15 covering produce much cleaner weld metal( lesser Oxygen , Nitrogen) that is must for  achieving Notch Toughness values at -196   Deg C .

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[pgos...@rogers.com]

Hi Sudhakar,

 

The rationale provided in your clients’ specification on SMAW welding consumable for -196⁰ C impact is not correct. SMAW and GTAW consumables conforming to 308L grades will happily meet the Charpy impact requirements @ -196⁰ C.

308L SMAW welding electrodes are well formulated and manufactured to meet -196⁰ C impact. You may take look at the products of Kobelco, NC 38LT(308L) & NC 36LT(316L).

In fact, 308L welding consumables always exhibits superior impact than SS 316L at -196⁰ C.

 

Sec VIII, DIV-1, UHA -51, illustrates the various technical requirements for cryogenic -196⁰ C design services , including  “Ferrite Requirements”.

 

Thanks.

 

Pradip Goswami.P.Eng, IWE.

Independent  & Consulting Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgos...@rogers.com,pradip....@gmail.com

Cell/Whasapp:1-905-9793232

 

Welding Handbook Quick View || Products || KOBELCO - KOBE STEEL, LTD. - (kobelco-welding.jp)

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[Ahmed Osman]

Dears ,

using E316L due to Mo content which is more than E308L .

304L base metal is less in Mo than E3016L which give a benefit for it than E308L regarding the risk of corrosion caused by the effects of molybdenum partitioning during solidification

also E316L give more better mech. prosperities even till -269c which meaning more confidence
 

Best Regards ,

Ahmed Osman

AWS CWEng , NDT level III , API 510 

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