Tube burn out

If I use a thick carbon steel tube for my burn tube and riser, will they eventually breakdown/melt?

I would uses a perlite mix as the surrounding insulation. Would I eventually have to rely on that as my riser?

From what I have read to both questions is “yes”. Right?

The temperate in the burn chamber get up to 3,000F.
So anything that has a melting point lower than that will burnout sooner or later.
Then there is also oxidation/rust, from the water/air/organic moleclues/high temperature involved.
So sooner or later it will need to be refurbished.

However if we know that it will last 10yrs+ then we can just replace it in the summer (or when we have extra money) before it fails and we really need it in the winter.

the kindling temp for mild steel is 1600F; just a scoche under glowing red. Mild steel will start to oxidize around there. you could go with a thick wall like 3/4 inch

I was looking at 1/2" carbon steel. I think carbon steel has a melt point around 2500F.

Once the tubing goes is the perlite mix going to suffice?

Its worth a try