steel low cost for elevated temperature

[vonzipper]

hi all,
i have some pipe with different diameters (from 8 to 24 inches) that are used for hot air at approximately 1040°F.
this pipes are in common carbon steel like A36 or similar and we cannot increase the temperature because the steel begin to oxidize.
Now we're searching for a material at low cost that can permit us to increase the remperature up to 1112/1200°F without oxidize.
Is there some kind of steel at low cost that could be used for this purpose?
I think to corten, what do you think about it?
many many thanks

VZ

 

[metengr]

What is the internal pressure of the hot air in the piping system?

 

[vonzipper]

consider it negligible.. or very low.

many thanks
VZ

 

[EdStainless]

There are coatings (ceramics and some nano-tech) that will greatly slow the oxidation damage.

How much trouble and cost is it to change these?
Maybe using very thin wall 409 stainless would make sense. Just enough wall to hold them together with no corrosion allowance. They might be thin enough to me economical.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[metengr]

Use a Cr-Mo pipe steel, SA-335 Grade P22 - easy to form, purchase and will hold up just fine.

 

[vonzipper]

we have many many meters of this pipes in our plant.
For the production process the increasing of temperature is a very very good thing but we cannot go out of budget for this item, so we're searching for something like carbon steel but maybe with better performance for oxidation.
Use pipes of stainless steel is to expensive, is it possible to coat a carbon steel pipe with a thin wall of stainless steel?
Corten is not the way at all?

thanks so much!
VZ

 

[metengr]

Corten is typically for weathering applications - external. There are elevated temperature grades of corten but this might be more expensive.

 

[vonzipper]

thanks so much mentengr and Ed for your opinions.
it's been very appreciated.
I'll check your ideas asap.

thanks
VZ