Stainless steel for the riser

Because of the quite intense handling of the perlite and clay riser tube ,i got it cracked and had to be replaced.
So i made 2 tubes from stainless steel sheet(316 ss) ,put them.one inside the otther and ive filled the gap between the pipes with bits of Ytong brick ( autoclaved concrete).
Its just a temporary measure for me and the stainless steel sheet its just 0,3 mm .
Will it last?
Anybody that uses stainless steel in the riser ( on the interior,in direct contact with the flames)?

My experience with 304 stainless steel its that it rusts slowly in the riser( becomes red color like its anodised then it rusts) but its resistant to keep the coals in the burn chamber where i have a thin 304 ss mesh screen as a separator between the burn chamber and the ash collector.
That its just 0,5 mm thick 304 stainless steel.

For the new riser thogh,ive used 316 stainless steel wich is slightly more resistant ( 100 C more resistant)and wich also has Molybdenum in it ,compared to the 304.

Hi Mihai;
I suspect it won't last very long.
When it does fail, isn't the Ytong brick is going to fall into the burn tunnel and block it ?
If it does that while a fire is roaring. It will flame out the feed tube. This could have bad results, inside your home...

How long will it last ? A fair while I'm sure.
If its just temporary, then keep a close eye on it and replace it as soon as possible.
I suggest a ceramic blanket five minute riser.

thomas rubino wrote:Hi Mihai;
I suspect it won't last very long.
When it does fail, isn't the Ytong brick is going to fall into the burn tunnel and block it ?
If it does that while a fire is roaring. It will flame out the feed tube. This could have bad results, inside your home...

How long will it last ? A fair while I'm sure.
If its just temporary, then keep a close eye on it and replace it as soon as possible.
I suggest a ceramic blanket five minute riser.

I will order a ceramic blanket but i was in a hurry needing to replace the perlite clay riser and couldnt wait until the ceramic blanket arrives.
The exterior stainless steel pipe i will be using to hold the ceramic blanket.
And the Ytong that ive used as a filler ,ive cut them in long strips and i dont think they will gonna fall that easy in case the stainless steel pipe on the interior fails.
Ive also tryed to mix glass wool with the Ytong bits so that the glass wool melts and glues the Ytong bits wich it works great,but ive quit it because my brother was coughing from the glass wool .

If you are ordering the ceramic blanket.
Then I am sure your temporary riser will hold together until your  blanket arrives.
Just keep an eye on it until it does.

My friends at Himalayan Rocket Stoves Himalayan Rocket Stoves are using steel for the heat riser, and they have several dozen stoves that have been heavily used for 3 winters and are still in good shape. They used a high quality expensive steel that is rated for industrial use and high temperatures, but I forget which kind.