ASTM A358 Product Analysis

[Deanlover]

Dear All,

I am confused the description about the Product Analysis in ASTM A358, the snapshot is below:

analysis shall be made by the manufacturer from the finished pipe of the plate and of the weld deposit.
Regarding this description, if only need to check the composition of the base material or both of base material and weld deposit?

As per the above snapshot, the result shall conform to the requirements of Section 7, which require the result need to comply with A240 or applicable AWS specification.

Acyually, we test the chemical analysis on the base material and weld deposit for S31254, result in that the result of weld deposit cannot meet the requirement of A240 or AWS applicable specification.

 

[EdStainless]

Plate AND weld are required for each 500'.
What spec is the weld metal to? Isn't it matching alloy? If so it should meet the chem within the allowed product tolerances.

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P.E. Metallurgy

 

[Deanlover]

Dear EdStainless

Thanks your reply,

AWS A5.14 (N06625) for S31254 welded pipe

 

[EdStainless]

What does your ASTM pipe spec say about using unmatched filler?
This usually raises other issues since you have raw filler chemistry but when welded there is dilution to be considered.

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P.E. Metallurgy

 

[Deanlover]

Dear EdStainless,

Dilution is inevitable.

How to understand this sentence specified in Section 11 Product Analysis of ASTM A358.
"analysis shall be made by the manufacturer from the finished pipe of the plate and of the weld deposit."

And Section 11 requires that "The results of these analyses shall be reported to the purchaser or the purchaser’s representative, and shall conform to the requirements
of Section 7", Section 7 is the requirement for plate and filler metal.

So we are confused.

 

[EdStainless]

I don't see why a small diameter drilled hole in the center-line of the weld wouldn't give you a true 625 chemistry.
You are right though, this is an interesting conflict. You could send a letter to the A01.01 committee and ask how this applies when the filler and base metal do not match (even though this is a combination that is listed in the spec).

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P.E. Metallurgy