So neither Q nor PKH were able to do the basic math, so I will do it here. (Note that it's just algebra.)

Assumptions:

WTC is ~1350 feet high. Let's assume that the mass is centered 1/3 of the way down. (This is conservative; it's probably closer to the center.) So the center of mass is at 138 meters.

WTC towers weigh about 500,000 tons.

Now the buildings collapse. Let us assume that 99.9% of the energy goes into the shockwave, into mechanical destruction of concrete, lofting debris high in the air and plain old air friction. That gives us .1% of the energy to act on the metal - by bending and crushing it. That energy gets turned into heat.

We know that most of the "molten metal" seen is aluminum from the aircraft melting. But was there enough energy to deform and melt the steel beams locally?

Let's assume that all the steel starts out at 20C. (Again this is extremely conservative, since some of it was much hotter than that.) We have 679 million joules being applied to that metal. It, of course, does not act on it all equally. Where the steel remains intact, no energy is transferred. Where the metal is bent or crushed, it is applied. Let us further assume that one metric ton of the total steel was bent and/or crushed this way.

That much energy, using a standard .466 J/g C specific heat for the metal, would have raised its temperature to 1477 degrees C. The melting point of steel ranges from 1370-1540 degrees C.

So yes, even with those very conservative assumptions, there was enough energy to (locally) deform and melt pieces of the steel structure of the building.