filler material between 304L and 316L

[Chiranjeevi A]

Dear Experts,

     At the site 308L filler wire used for the Pipe joint between 304L and 316L.  After doing the PMI QC rejected the joints and suggesting to use 316 filler.

   Experts kindly share the details of the code reference to accept or any procedure to avoid cutting 20joints.

[james gerald]

You can use either ER316L or ER308L welding consumable.

below from API 582

AWS D 1.6 recommends 308L as below.

Technically the Base metal dissimilar (304L & 316L) will be subjected to the same process fluid as the weld metal lower or higher side.

Thanks & Regards

J.Gerald Jayakumar

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[Vinay Thattey]

please share a basis for rejection..

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[Ramon Briceno]

Dear Chiranjeevi  for  this 304L / 316L weld, a qualified WPS should have been used where the filler material was superior metallurgy for the joint. In this case, use type 316L filler material to achieve adequate Mo content as protection against intergranular corrosion by chlorides, for example.

Sorry, I think you're going to have to cut those 20 welds made with 308L.

In all Codes and Standards, good welding practices indicate the correct combination.

 

Regards,

Ramon Briceno

Metallurgical Engineer.

Amon

 

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[Arun Padman]

You can refer to API RP 577 APPENDIX D,

But it's an RP, not a standard.

As per   API RP 577 APPENDIX D you can use both 308L and 316L filler wire.

Regards,

Arun Padman Manayil

Plant Inspector 

Tel:+974 50577156

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[Ramon Briceno]

Dear Arun,

 

From the Recommended Practice API 577: "Welding Processes, Inspection, and Metallurgy", it is achieved:

Annex D, Table D.2 reads: —Common Welding Consumables for SMAW of Carbon and Low-allow Steel.

It should say: —Common Welding Consumables for SMAW of Stainless Steel.

This table contains the Base Metal combination for stainless steels.

If we observe, it has three calls: 1, 2, 3.

Call 2, says: "The higher alloy electrode specified in the table is normally preferred".

This confirms that if you have two different Base metals (304L and 316L, for example) within the same SS family, the electrode that is chosen is the one that contains more alloying elements compatible with the higher alloyed base metal. In this case, the welding electrode for the combination 304L / 316L should be E-316L. (AWS A5.4 Classification E316L-XX).

It is understood that the weldability in this combination is maintained, regardless of whether you use E-308L or E-316L.

The service, the current of the fluid that is handled, would be the determining factor to use one or the other.

 

Regards,

 

Ramon Briceno

Metallurgical Engineer.

 

 

 

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[Vanchinath S.A.]

You can use either of filler metal for dissimilar joint between 304L and 316L.

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[Xuân Thông]

Dear Sir,

I think noproblem for mechanical properties of weld joind

You shoud be use the filler metal 316L if when chemical is required

In this case, base metal is 304L and 316L, so I think no special requirement

Vào Th 7, 8 thg 5, 2021 vào lúc 20:01 Arun Padman <arunpad...@gmail.com> đã viết:

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[Kannayeram Gnanapandithan]

Ref ASME B31.1, 127.2.1D

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[Mani]

P Number & Group  Number are same for 304L & 316L.( P8 & Gr-1)

For the consumables , it has the same F Number  & A Number. ( F-6 & A-8)

So it is acceptable...

Thanks & Regards,

Mani

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[Ganesh Muthurajan]

Gents.

Apart from the PMI Rejection, as per WPS (also PQR) which filler and electrode  you are using.

I. If the PQR and WPS having qualified for 304L and 316L for 308L.

  There is no issue with PMI Rejection.

But. As per ASME B 31.3 

We have always select lower tensile and higher chemical analysis.  

Selection of filler ASME SEC 2C . 

In this case we gave to go for 316L 

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[Kannayeram Gnanapandithan]

Ref  31.1, 127.2.1D

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[Ron Mays]

Stainless steel is commonly used for its corrosion resistance properties.

When welding different grades together, consideration should be given to the selection of a filler metal that provides the mechanical properties required and the weld ferrite content.

Ron Mays

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[Kannayeram Gnanapandithan]

Mo  also increase delta ferrite which is inferior for resistance corrosion. Mo is good for pitting or previa corrosion resistance. 

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[Chiranjeevi A]

Dear sirs,

 Thank you so much for your valuable suggestions and technical support.

 We are doing new PQR and WPS for 304L/316L with filler material 308L and also with 316L.

Thanks and Regards

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