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Source of Cautionary Note in ASME Section II, Part C for E309 Filler Metal

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MikeMet

MikeMet

Chemical
Dec 11, 2008
164
In ASME Section II, Part C, Appendix A, A7.10, the description of E309 filler metal there is a cautionary note that states: Embrittlement or cracking can occur if these dissimlar steel welds are subjected to a post weld heat treatment or to service above 700C.

I believe this had to do with cracking of weld many years ago. I have searched extensively on the net with no satisfaction. Does anyone have a good explanation for the note and/or can point me to sites or articles I can read?

I know manufacturers like Kobe have and are currently remixing the fluxes to help prevent this.

Thanks for the help.
 
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The source of the cautionary note stemmed from concern over past failures related to either carbon migration and/or sigma formation in the weld deposit itself (based on ferrite content) and elevated temperature exposure at or above 700 deg C.

 
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We still have a lot of engineers who will not accept 309 filler metal when the vessel is stress relived because of this note in the code. Even though it is not relevant in the past 20 yrs they still insist that we use ERNiCr-3 for dissimilar aloys when subject to PWHT. Engineers still work in the dark ages for the most part.
 
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This cautionary note is indeed very relevant for dissimilar metal welds operating at or above 800 deg F, because carbon migration is happening resulting in creep failures. I do not allow 309 filler metal for DMW's operating at or above 800 deg F by design. For service temperatures at or below 800 deg F, no problem with using 309 even with a PWHT.
 
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