And note that at 800 bars of hot oxygen, metal doesn't so much rust as it burns with a bright flame. The environment in the Raptor oxy-rich preburner is much wo

And note that at 800 bars of hot oxygen, metal doesn't so much rust as it burns with a bright flame. The environment in the Raptor oxy-rich preburner is much worse than the typical oxyacetylene torch that is used to cut steel.