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How hot does metal have to get to glow white hot? How hot is this kart afterburner? I assume any temper is shot.
https://www.youtube.com/watch?v=WHEHMFbEH8I
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The bright yellow just before it turns white is 2500 F (1370 C), the max forging temperature for carbon steel, and melted for stainless. White is right at meltpoint, which for carbon steel is 2935 F.
I noticed a blow-out dimple forming forward-bottom-ish as the clip ended. They ruined their afterburner can.
Tempering is done under 1000 F, which is the straw color long before it ever begins to glow incandescently.
The silvery appearance of the metal before the burn suggests a 300-series stainless. That means white hot is closer to 2500 F than it is 2900 F. The yellow is correspondingly lower, too.
Overheat at full rich mixtures is precisely why uncooled structures are infeasible for afterburner ducts or ramjet engines. The combustor can is limited to under-2000 F by the turbine, and it nearly always takes the form of an air-cooled double-wall device, which is why it never got too hot, not even tempering temperatures.
GW
GW Johnson
McGregor, Texas
"There is nothing as expensive as a dead crew, especially one dead from a bad management decision"
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