Usually, but shoes for racing horses are made made of steel. Part of the reason that they are worked at a lower temperature to not mess up the material. When my boy toy does smithing, he carefully monitors the temperature with an IR thermometer to make sure there isn't that much of a phase change for the material. Overheat and the metal becomes too soft.
http://www.thefarrie...als-horseshoes/
The point stands though, he softens the metal with heat, at a temperature much lower than burning kerosene. They bend. For that matter, so what does it matter what temperature kerosene burns. There were other materials in the twin towers that burned hotter than kerosene.
it would have taken quite a bit of time for anything to reach a temperature to melt steel enough to collapse a giant building (let alone two)
they collapsed instantaneously. into their own footprints.