I've done a lot with catalysts professionally. I could all but guarantee it is a 300 series stainless. From an OEM side, we typically use 309L for the filler rod.
If it has a stainless substrate, then the mantle is definitely stainless.
If it has a ceramic substrate, then the mantle is extremely likely to be stainless.
Quote:
Originally Posted by dummins
I’d assume it’s stainless.
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This
Quote:
Originally Posted by joefarmer
Even if it's not stainless, welding it with a 308L should work.
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And this