Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
(OP)
I have a project with a customer requirement of FN between 3 & 10 for the combination of 347SS and 310SS using ER309L filler. At 1st glance, I thought that would be easy to meet since it's a common range for Austinitic SS, but looking further into it, I see threads in this forum stating that 309 & 310 both are often very stable and have zero ferrite formation. If that's the case, then the 347/310 combination could have a lower FN that I'd originally thought.
I found an online tool for the Schaeffler diagram. The resulting FN varied greatly depending on dilution. I could ask what a typical expected dilution for multipass TIG welds would be, but I'm sure the answers would start with "It depends".
What recommendations do you have for the joining of these materials so that we meet the FN requirements?
I found an online tool for the Schaeffler diagram. The resulting FN varied greatly depending on dilution. I could ask what a typical expected dilution for multipass TIG welds would be, but I'm sure the answers would start with "It depends".
What recommendations do you have for the joining of these materials so that we meet the FN requirements?
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
What about the 347? This should be a bit higher, the material that I have seen was often 5-8 FN.
Work it out for various dilutions, you may be OK even with 310 near zero.
But you PQR will be the final word.
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P.E. Metallurgy, consulting work welcomed
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
I've run the calculation in that link, and once I get up above 40-50%, I'm within that range. Lower than that is too high.
Yes, we can run samples at least if we don't need a new PQR.
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
Huub
- You never get what you expect, you only get what you inspect.
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
Huub
- You never get what you expect, you only get what you inspect.
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
Not sure if all suppliers have such details, as this is more a service driven limitation than a welding process driven limit.
Huub
- You never get what you expect, you only get what you inspect.
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
The devil is in the details; she also wears prada.
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
Huub
- You never get what you expect, you only get what you inspect.
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
I mislead this discussion on the 27th @ 13:19. Please see my post @ 15:30. I threw out typical maximum design conditions for our most popular product, not fully thinking through the implications. It is very possible it is a different product with lower design temperatures. I just don't have those specifics yet.
Thanks, DVWE. We are primarily servicing the chemical industry, so API RP 582 will likely suit my needs just fine.
RE: Ferrite number estimate: Combination of 347SS and 310SS, ER309L filler
A PQR can be a useful guide but will not tell you what ferrite you actually get on the day of production welding (with possibly different materials than qualified).
The Fischer FerritScope is my go-to instrument for measuring deposit ferrite. Accept no substitutes.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"