303 SS and bronze threaded fitting corrosion
303 SS and bronze threaded fitting corrosion
(OP)
Plumbing issue - bronze valve threaded into a 303 SS housing using Loctite 567 pipe dope.
Only seen in this location so far. Could be plant-specific (Looking into grounding issues) but was wondering if passivating the 303SS would help prevent and are there other things to consider?
Thanks in advance.
Q~
Only seen in this location so far. Could be plant-specific (Looking into grounding issues) but was wondering if passivating the 303SS would help prevent and are there other things to consider?
Thanks in advance.
Q~
RE: 303 SS and bronze threaded fitting corrosion
RE: 303 SS and bronze threaded fitting corrosion
While 304 would be better than 303 it isn't by much.
Why not all Bronze?
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
RE: 303 SS and bronze threaded fitting corrosion
RE: 303 SS and bronze threaded fitting corrosion
DHURJATI SEN
RE: 303 SS and bronze threaded fitting corrosion
The application is used for potable drinking water where it needs to be NSF-61/372 certified and we started out years back with 303SS since the Mueller-type brasses weren't very price-friendly at the time.
Casting CDA87500 could be considered since we have another product that is made with it but the lack of Pb seemed to cause flow / porosity issues at the foundry in the past.
We sell thousands of these units and it's only occasionally we see this problem which is why we thought it was site-specific.
RE: 303 SS and bronze threaded fitting corrosion
There are ways around the brass casability issues that don't involve Pb, but they cost more.
There are other SS grades that would offer better corrosion resistance when you need them. 303 is a very poor excuse for a SS. Consider 2101 as an option for 'special services'.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
RE: 303 SS and bronze threaded fitting corrosion
RE: 303 SS and bronze threaded fitting corrosion
stevenal - if you mean pipe dope, yes we use Loctite 567
RE: 303 SS and bronze threaded fitting corrosion
RE: 303 SS and bronze threaded fitting corrosion
RE: 303 SS and bronze threaded fitting corrosion
RE: 303 SS and bronze threaded fitting corrosion
I've had much better luck since I began using it.
RE: 303 SS and bronze threaded fitting corrosion
Crevice corrosion, good point. We build these in-house so will need to verify application of sealant.
Yes, we do use the primer on other threaded parts along with Loctite 272 but didn't consider using on pipe threads with the 567.
What's leaking? It's domestic plumbing so only potable water.
RE: 303 SS and bronze threaded fitting corrosion