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Hastelloy C276 versus Hastelloy C-22
4

Hastelloy C276 versus Hastelloy C-22

Hastelloy C276 versus Hastelloy C-22

(OP)
Dear "metal masters":
which arew the differenced between Hastelloy C-276 and Hastelloy C-22 and which of the alloy is more resistant to the contact with hot HCl solution at 9%?
Thanks for your help.

RE: Hastelloy C276 versus Hastelloy C-22

I'm pretty sure Haynes Intl. offers technical and applications assistance. I think this number is still valid 800-354-0806

RE: Hastelloy C276 versus Hastelloy C-22

(OP)
Thanks guys.

RE: Hastelloy C276 versus Hastelloy C-22

Just for curiosity is this just plain HCl or is there any other components?

RE: Hastelloy C276 versus Hastelloy C-22

(OP)
Let me just explain the function:
This is a part in Hestelloy at the exit of our recovery boiler. As such, this is subject to a big chemical attack because the gases exit at around 350C from the boiler and are cooled down to around 70C trough water spray in this part. The main component that might attack this is HCl.

RE: Hastelloy C276 versus Hastelloy C-22

What is the composition of your flue gas and probably more important what type of fuel are you burning? Most of the scrubbers that are being installed on Fossil Plants use C-276 materials to handle the worst corrosion conditions which occur at the inlet flue gas duct to the FGD absorber vessel. I don't believe 10% HCl concentration is going to happen.

RE: Hastelloy C276 versus Hastelloy C-22

Elevated temp. and HCL is Hast. B territory.

RE: Hastelloy C276 versus Hastelloy C-22

(OP)
This is a recovery boiler that burns the secondary products of our production processes. Taht's why the HCl content.

RE: Hastelloy C276 versus Hastelloy C-22

Hastelloy C22 is a further development of Hastelloy C276 for better general corrosion resistance and to handle high concentrates of chlorides better at elevated temperatures.
But as often in practice it is not that easy and there are still area’s where C276 is better than C22, in certain reducing environments. In general C22 is to prefer in highly oxidising environments.

I also like to comment on Metalguy    quote “Elevated temp. and HCL is Hast. B territory”

Be very careful!!! ONLY FOR REDUCING ENVIRONMENTS you can use a Hastelloy B type! A few ppm ferric or cupro oxidising salts will generate rapid attack, sometimes in days.

Regards
dutchmat

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