Originally posted by duby229
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Up to modern times they just threw iron-rich ores in furnaces fueled with wood or wood coal and then hammered the red-orange blob into shape. But it was not anywhere near molten. Just softened up, while the lesser ores were molten and poured out of the furnace.
It has the consistence of crappy soft metal, like say lead, or gold, which you can hammer into shapes, but it is still solid, not molten. Look up on youtube for Shadiversity or others that discussed the old technology used to make swords before modern high-temperature smelting processes were possible at all. The whole thing is very well-known and documented.
To cause a structural failure in a building you don't need to melt anything, just to heat the beams enough to soften them up a bit so they become too malleable to support the weight they have on, which is usually even before they start to glow red, for the type of loads in a building.
If a couple guys can soften iron enough to hammer it into a sword by using a crappy clay furnace fueled with normal wood, go figure a shitton of jet fuel burning like hell with massive oxygen intake due to wind at the skyscraper height.
Which is the reason why spray-on heat-resistant coatings on steel structure of buildings are a thing in modern designs.
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