WE know the original full-size bell is made from a very expensive niobium alloy, for heat resistance. But I notice that the new bell hardly glows at all - just very faintly at the extreme outer edge. The film cooling provided by the turbopump exhaust protects it completely.
So, I am wondering - are they still using that expensive niobium for the stubby nozzle? From what I can see of the bell, they could use simple mild steel and be perfectly OK.
I can’t imagine them using something expensive if they don’t have to, considering they are already sacrificing isp to save a few Bob.
What are regular raptor bells made from? I’d say if they could use common material they would