Guys,
No steel melted. It takes a lot higher temperatures to "melt" steel than ANYONE has claimed were generated by burning jet fuel.
The claim that there was molten steel in the towers started only because truthers spotted a photograph of red hot material spilling out of one of the towers before it collapsed. It is not melted steel. When seven floors of a skyscraper each of which are an acre in size become engulfed in fire, there are a great many materials in those offices which concentrate toward the easiest escape and it was seen pouring out of the corner of a lower floor in the impact zone.
Nobody associated with the "official story", nobody at NIST (the body of professional scientists and engineers who studied the collapses for a whole year), nor anybody else sees that as "molten" steel. That claim happened only because a truther saw the photograph and labeled it that. And then everyone who wants to believe it believed it. Which equals a million fellow truthers.
Once the collision knocked the fireproofing off the steel beams ( steel beams which are keeping the building up), the jet fuel heated the steel. Steel really loses it's strength with even that amount of heat and starts to warp and sag. Which is why they spray fireproofing on it to begin with because they know what will happen if they don't. But they didn't account for what the devastation the collision of a 767 traveling at 500 mph could do. And once the fireproofing was gone, over time the steel heated up and warped and sagged. And when that happens it breaks lose of the skeleton. And when steel beams holding up an acre of concrete floor slab can no longer hold it up, what do you think will happen.