Pellet rocket stove steel heat risers question

So i have been working on a small rmh that works on pellets and can provide heat to small spaces like a camper ect.

I built also been building a batch stove and during that read and heard and saw in video that steel heatrisers and burn tunnels get destroyed by heat, low carbon,high oxygen enviroment.

But i keep seeing people building pellets versions with steel parts.

Can someone shed some light.

Is it ok to use steel for small pellet stove?
Just curious what peoples thoughts on the subject are


Fraser

Hi Fraser;
So, first there is a big difference between a rocket stove and a rocket mass heater
The short answer is all metal is doomed to fail EVENTUALLY..
A true rocket mass heater that is running at high temps will spaul the metal quickly.
A  rocket stove that isn't really running at high temp and has no mass , could get away with metal parts for a few seasons.
Any of the metal stoves will eventually fail it just depends on how often and how hot they are run.

A few more things to add to Thomas's descriptions would be that most metal when insulated, will spall and degrade very quickly. When uninsulated, it is able to shed its heat as quick as it takes it on and therefore will last a lot longer, but also that it won't get up to a really high temperature that a RMH is designed to burn at.
Steel certainly has its place, just typically not in the core of a RMH unless your looking at a much pricier steel such as RA 330.  

Thanks alot guys for clearing that up.

I knew that insulting steel parts heats them up and does not allow them to shed heat leaving to them failing. For instance the inside of a heat riser

In short.
Rocket stove (the ones you see for cooking can be steel but will degrade over time.

Rmh. Ceramic fibre board and similiar things.

I have seen one guy. Shout out to littleaussey on youtube who is making pellet stoves with stainless steel parts for the heat riser.
I guess you using those materials will indeed shorten the life but gives the opportunity for smaller stoves.