View attachment 306673
As seen from the colour chart, the mild steel flame tubes were glowing "dull red."
They were coated with aluminium oxide to reduce the rate of oxidation.
See
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA800524 with regard to reliability and general flyability.
Factual data:
1. Introduction
The Me 262 is a German jet fighter bomber powered by two JUMO 004 axial-flow jet engines rated at 1980 lb thrust at 8700 rpm."
"Two airplanes Nos T-2-711 and T-2-4012 were used in this test program. General maintenance was very difficult on both airplanes. Number T-2-711 was flown 12 flights for a total of 10 hr 40 min, and No. T-2-4012 was flown eight times for a total of 4 hr and 40 min. Four engine changes were necessary on [the former] and five on [the latter]. Power failure in flight resulted in abandonment of the airplane and complete destruction of No. T-2-711. Tests were discontinued on No T-2-4012 after two single-engine landings resulting from engine failure in flight, because the value of further flights was not believed to be worth the risk and trouble of maintaining the airplane…"
The average engine life before overhaul (or throw-away) above is a bit over 3 hrs.
About 1400 Me 262s were produced and delivered, but the best that the Luftwaffe managed to get into the air on any given day was about 55. Twenty to thirty was much more typical.
Not any wonder...