I worked at Pratt & Whitney for a few years, they use a high nickle steel, known as inconel for the high compressor blades.
Now its extremely hard, and very expensive. You need special machinery to cut it.

The amount of heat required to melt steel in those towers would be impossible to achieve. You need to atomize the jet fuel to get it to burn, it burns terribly poorly otherwise. That is by design BTW, in case of a crash it helps to save lives.

Also, the inertia of those planes would have caused the fuel to keep moving and create a massive fireball on the other side of the building, as was seen.

Think about it, plane going 650 KM/H +, the fuel weighs tons, that isn't going to just stop, it has a lot of weight and keeps going. It will want to keep going, any of you drivers who drink coffee in the morning and have slammed on your breaks only to find it on your lap know what I'm talking about.

It was a pretty sloppy story, that was full of holes.
Most of the jet fuel was ejected through through inertia.
Take a glass and water and slam it forward, then jerk it to a stop, it flies forward out of the cup. Same deal here.