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Why not to use carbon steel pipe for a flask

Howdy-

Thanks for the suggestions on how to improve my brass castings.

In addition to being a metalsmith I am also a licensed steamfitter
and plumber (I like to joke that my midlife crisis was to become a
construction worker). Through this other carrier I have sometimes
have access to stainless piping from which I make casting flasks.

My question is this, does anyone know of a reason not to use
carbon steel pipe for a flask. In my situation carbon steel piping is
much easier to get a hold of as stainless isn’t used on every job. If
you Google ASTM A106 carbon steel pipe you can find the specs on it,
if that helps. I haven’t tried it because I really hate going through
the entire casting process and having it fail, even though I have
done that plenty of times.

Looking forward to your responses.
Be well.
Dana

Hi Dana,

No reason not to use it that I can think of. What do you think they
used before stainless got common?

They will rust out on you eventually, but I’ve seen some carbon
steel ones that I knew were at least 50 years old and still going,
so for whatever that’s worth.

Keep them clean and dry, and you’ll like them more.

FWIW,
Brian

My question is this, does anyone know of a reason *not* to use
carbon steel pipe for a flask. 

I’m pretty sure that the dozens of flasks I use for casting are
carbon steel, not stainless, as they all rust to some extent.

I just knock off any loose rust and spalling flakes with a wire
brush before I use them. Haven’t had any problems with them yet, and
some of them are over 20 years old.

Kathy Johnson
Feathered Gems Jewelry
fgemz.com