RE: [MW:28332] CRITERIA OF CLAD THICKNESS

Hi Ali,

I've incorporated some notes on your query. Hope these would help you.

 

Thanks.

 

P.Goswami.P.Eng, IWE.

Welding & Metallurgical Specialist

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

Email:pgoswami@quickclic.net,pradip.goswami@gmail.com

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ali Asghari
Sent: September 23, 2018 7:07 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:28330] CRITERIA OF CLAD THICKNESS

 

yes, the corrosion rate of inconel in G28 not in service condition

 

On Sun, Sep 23, 2018 at 1:32 PM George Dilintas <dilintas@gmail.com> wrote:

THE CORROSION RATE YOU MENTION IS THAT OF INCONEL???

 

Στις Κυρ, 23 Σεπ 2018 στις 5:16 π.μ., ο/η Ali Asghari <asgharialigl@gmail.com> έγραψε:

Dear George.

 

In our project, we ordered some X52 pipes that internally claded& weld overlaid with INCONEL 625 and for qualification of welding procedure, we want to do ASTM G 28 for detecting of susceptibility of inter granular corrosion.

Now  some issues arised:

1.Acceptance criteria that we have found in major documents such as " R Baboian, Corrosion Tests and Standards: Application and Interpretation, ASTM Manual Series MNL 20, second edition, 2005, ASTM, PA, USA" said 0.8 or 0.9 mm/year that but in TOTAL specification of "GS EP PVV 618"say 3mm/year(ideally 1-1.2mm/year). which of them is reliable and when the other can be chosen?

v  You've to meet the criteria of TOTAL. Corrosion rate on this alloy may be less than what's mentioned in the referenced  standard, however for a weld overlaid deposition the corrosion rates may vary subject to many factors, consumable composition, welding process, heat input, techniques, dilution levels during welding, Iron(Fe) content in the filler metal….. and many more.

2.Sample preparation not specified in the standard in through thickness direction and I don't know how to prepare it. is it necessary to prepare samples from whole clad(3.7 mm that included interface) or 1 mm from cap surface of clad is enough or other option? this question arises from this point that IGC comes from carbide & inter metallic that mostly possible in diluted area . Now is it reasonable to prepare sample that interface involved it or not?

v  Only the clad(overlay) should be subjected to the above test. The test solution is too aggressive for the X-52 steel. What matters in terms of corrosion testing is for the 625 overlay deposit not the backing material.

v   The specimen thickness (after milling) should represent the actual clad thickness asked in the design specification(3 mm or more). You may mark the X-52 side or the final deposition (process fluid bearing side) for identification and any subsequent analysis.

 

"The intent is to test a specimen representing as nearly as possible the material as used in service. The specimens should be cut to represent the grain flow direction that will see service, for example, specimens should not contain cross-sectional areas unless it is the intent of the test to evaluate these. Only such surface finishing should be performed as is required to remove foreign material and obtain a standard, uniform finish as specified in 6.4. For very heavy sections, specimens should be maintained to represent the appropriate surface while maintaining reasonable specimen size for convenience in testing. Ordinarily, removal of more material than necessary will have little influence on the test results." this paragraph is taken from G28 and only said about the surface area but didn't talk about any thing about cross section or through thickness orientation of sample especially for weld deposited over laid that have a metallurgical & diluted interface can rise possibility of detrimental phase.

 

v  The intention is to test the clad/overlay. Hence the grin flow of the X-52 material would not matter. However advice is to extract the specimens in the direction of overlay.

Would you share your experience or address me to a document that specify this issue?

 

Regards.  

 

On Sat, Sep 22, 2018, 4:53 PM George Dilintas <dilintas@gmail.com> wrote:

it depends on the corrosion rate and some allowance for dilution

 

Στις Δευ, 23 Ιουλ 2018 στις 5:24 μ.μ., ο/η Ali Asghari <asgharialigl@gmail.com> έγραψε:

Dear All.

 

Does anybody know about how a designer calculate the thickness of clad material especially for sour service and how much is conservative?

because in our project documents have not said clearly that thickness of clad have to be measured from base material or from layer that dilution is negligible and this question remained does designer account or consider dilution or not?

 

Regards.

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Dr. Georgios Dilintas,

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Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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