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Quote by: dotcoma Do you not understand that even slight amounts of heat can alter the integrity of steal? |
that's not really true. from my engineering days, i recall (vaguely) you normally have to go above around 700 deg. Celcius to start working carbon steel.
this depends on a range of factors but certainly "slight amounts of heat" won't be enough to get steel high enough to exhibit phase changes.
i haven't read the entire thread here, but from memory the heat given off by the burning jet fuel was enough to raise the temperature of the buildings' steel structure above melting point, which is around 1300 deg. C.