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OK, i'm a metalworker and welder... i heat up metal and try to bend it quite often. Granted i don't usually try to knock skyscrapers over but i think the theory applies.
I'd be a very old man if had to wait for a kerosene fire to make even a flimsy piece of sheetmetal soft enough to bend.
No way will a big girder fall over at 650 degrees, not even double that.
What you are suggesting would mean new exhaust systems would fall off cars very soon after starting them, assuming they'd even run since the spark plugs would have melted already.
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