SS 317L welding with 316L consumable

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Venkat

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Feb 10, 2020, 2:16:29 AM2/10/20
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Hi experts

Contractor is proposing SS 316L pipe in place of SS 316L since it is not readily available (requirement is 20" pipe, 0.5m length with 2 nos joints). Though it is superior grade I am having doubt on welding. 
SS 316L PQR is already established with 316L welding filler wire and electrode. 

Can the same PQR be used in SS 317L pipe(thickness limits is within the WPS range)?  

Regards,

N. Venkadesan

Kannayeram Gnanapandithan

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Feb 10, 2020, 6:21:59 AM2/10/20
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Yes. It is better because it has more Mo than 316. Pl check your application

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Vinay Thattey

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Apr 8, 2020, 12:20:23 AM4/8/20
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308L filler can also be used . 

Kannayeram Gnanapandithan

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Apr 8, 2020, 12:32:33 AM4/8/20
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Query is not having clarity. SS 316L is same as SS316L. Contractor is offering 317L instead of 316L. No issue u can use same filler if you don't get 317L. It is not first priority to use 308L as it doesn't have Mo which is important for pitting corrosion resistance. 

james gerald

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Apr 8, 2020, 1:31:50 AM4/8/20
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Use the 316L qualified PQR to prepare WPS using SS317L Filler Rod when Impact testing is not required.

Thanks & Regards

J.Gerald Jayakumar



Venkat

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Apr 8, 2020, 3:17:13 AM4/8/20
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Thank You Mr Gerald Jayakumar. 
There is no impact requirement in the service. However if impact is there, it affects thickness limits only right? Then why can't we use this (SS316L)PQR for SS317L pipe, if impact requirement is there?
Request to clarify.


On Wednesday, 8 April 2020 11:01:50 UTC+5:30, gerr...@yahoo.com wrote:
Use the 316L qualified PQR to prepare WPS using SS317L Filler Rod when Impact testing is not required.

Thanks & Regards

J.Gerald Jayakumar



On Wednesday, April 8, 2020, 11:20:16 AM GMT+7, Vinay Thattey <vinay....@gmail.com> wrote:


308L filler can also be used . 

On Mon, 10 Feb 2020 at 12:46, Venkat <venkad...@gmail.com> wrote:
Hi experts

Contractor is proposing SS 316L pipe in place of SS 316L since it is not readily available (requirement is 20" pipe, 0.5m length with 2 nos joints). Though it is superior grade I am having doubt on welding. 
SS 316L PQR is already established with 316L welding filler wire and electrode. 

Can the same PQR be used in SS 317L pipe(thickness limits is within the WPS range)?  

Regards,

N. Venkadesan

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Venkat

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Apr 8, 2020, 3:17:14 AM4/8/20
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Thank you Mr kannayeram Gnanapandithan
Though it is having same P no. I just want to get an expert advise on this. Now I understood that 317L pipe can be welded with either 316L or 317L filer wire. 
However contractor's engineering department raised their concern as follows and it is held,

//due to the high Molybdenum content of 3-4% in 317L compared to 316L content (2-3%) and if any oxidizing agent such as nitric acid will react with the Molybdenum and it is less resistant and lead to corrode//


On Wednesday, 8 April 2020 10:02:33 UTC+5:30, kannayeram gnanapandithan wrote:
Query is not having clarity. SS 316L is same as SS316L. Contractor is offering 317L instead of 316L. No issue u can use same filler if you don't get 317L. It is not first priority to use 308L as it doesn't have Mo which is important for pitting corrosion resistance. 

On Wed, 8 Apr 2020 9:50 am Vinay Thattey, <vinay....@gmail.com> wrote:
308L filler can also be used . 

On Mon, 10 Feb 2020 at 12:46, Venkat <venkad...@gmail.com> wrote:
Hi experts

Contractor is proposing SS 316L pipe in place of SS 316L since it is not readily available (requirement is 20" pipe, 0.5m length with 2 nos joints). Though it is superior grade I am having doubt on welding. 
SS 316L PQR is already established with 316L welding filler wire and electrode. 

Can the same PQR be used in SS 317L pipe(thickness limits is within the WPS range)?  

Regards,

N. Venkadesan

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james gerald

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Apr 8, 2020, 4:10:09 AM4/8/20
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AWS Classification QW404.12 is a Supplementary Essential variable. You cannot change the welding consummable.

Thanks & Regards

J.Gerald Jayakumar


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Kannayeram Gnanapandithan

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Apr 8, 2020, 4:10:12 AM4/8/20
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If impact is there, what is the issues. Could someone please explain. 

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George Dilintas

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Apr 9, 2020, 12:24:01 AM4/9/20
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317L and 316L have the same P-No and Group No, if the A no of the filler metal and Fno don't change you don't need a new PQR

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Dinesh Somwanshi

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Apr 9, 2020, 1:12:09 AM4/9/20
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Dear Team, 

If pipe has Mo More than 2.5 % then needed actually it's for 316 pipe chemistry.

Please use same PQR without requalification.

Regards

Dinesh



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Venkat

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Apr 9, 2020, 2:46:37 AM4/9/20
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Thickness limits is supplementary essential variables as per Sec. IX, Table QW-253(SMAW), Table QW-256 (GTAW). 
QW-403.6 says, The minimum base metal thickness qualified is the thickness of the test coupon T or 5/8 in. (16 mm), whichever is less. However, where T is 1/4 in. (6 mm) or less, the minimum thickness qualified is 1/2T.

After discussion with the experts, I understood that, since pipes 316L & 317L are having same P No. G No.(P8, G1) and E316L & E317L are having same F Nos (F No 1 for SMAW & F No 6 for GTAW) and same A nos(A no. 8). I can proceed with the same PQR qualified for 316L pipes, if impact requirement is not there.

Thanks to each and every one.
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