Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
(OP)
This is a material sourcing concern as you might have already guessed.
I need to know of any possible complications or incompatibilities between any two of these alloys when fabricated.
I am thinking of using 686 filler metal regardless of selection.
For example, do any require annealing after welding/forming?
.
I need to know of any possible complications or incompatibilities between any two of these alloys when fabricated.
I am thinking of using 686 filler metal regardless of selection.
For example, do any require annealing after welding/forming?
.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"





RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
The service is crude overhead piping where C-276 is the recommended alloy.
It is exceeded in corrosion resistance by the others I listed in many applications; is that also true for this application?
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
You need more information to perform a proper material comparison. What is the operating temperature of the line, flow, corrosive species, acid or reducing environment, pH....? This is not something anyone on this forum can easily answer off the top of the head, nor would I risk such a off the cuff recommendation.
Do as I said, and visit the web sites and evaluate corrosion performance based on your stated service conditions.
RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
http://www.nickelinstitute.org/~/media/Files/Techn...
RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
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RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
Who says that C-276 is the recommended alloy, and on what basis do they say that? I've had clients who insisted on a particular grade but when we dug into it, we found out that they had been using devices for years made from other grades and hadn't even realized it. Corrosion and superstition often go hand in hand.
These grades do have different resistances to different corrodents, which again differ depending on product form and post fabrication treatments. But that is only meaningful for particular corrodents and when a particular alloy is specified. And as EdStainless says, there are some generic versions missing some important alloying constituents out there.
RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
I appreciate your comments, and I have not said what the service is - it is for a crude overhead line, where erosion-corrosion and the other usual suspects are issues. Droplet impingement corrosion is a specific problem. We are very aware the current MoC is very insufficient.
316 is definitely not an option; C-276 was recommended by an experienced corrosion consultant who has been active in NACE for many years.
I would definitely like to know what to watch out for when buying C-276 or other C alloy. Is it down to composition, processing, and/or country of origin?
p.s., knowing nothing about coriolis meters I had to google it. See if you can spot the error on page 3 of this brochure - https://www.honeywellprocess.com/library/support/P...
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
RE: Welded Hastelloy C-276, C-22, C-2000, Inconel 686 -- Freely Interchangeable?
In my book the big factor in favor of the newer generation C alloys is that they have better microstructural stability, that is they are less likely to form detrimental secondary phases (such as in weld HAZ).
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