CACB,
@tfk
But, as the clip illustrated, he clearly feels the WTC steel was "crime scene evidence" and should have been further investigated and examined and not shipped off and recycled. Did he not?
In the clip, he clearly states he saw the "melting of girders". Last I heard, girders are made of steel.
I don't know how honest or agenda-driven (aka "dishonest") you may be. You are apparently new here.
If you are earnest, I'll try to help you understand some of the engineering issues. If you have real questions, and are looking for real answers, I encourage you to continue.
If you are firmly ensconced within a Fortress of Ignorance, and no words that I or anyone else could say will sway any aspect of your conclusions, please say so now, and don't waste my time.
If you turn out to be determinedly, block-headedly uneducable, then I'll choose to ignore you.
No steel melted.
There was some steel, not much, a small amount, that had eroded away significantly. This clearly happened in the heat & chemical soup of the debris pile, and therefore had nothing to do with the collapse. Precisely because it happened well AFTER the collapse.
Even in these pieces (studied in detail by Barnett, Beiderman & Sisson at WPI, and reported on in detail by both FEMA & NIST), no steel melted.
No steel vaporized.
A36 (used predominantly in the towers) is a mild, low carbon steel which melts at ~1400°C. It is highly probable that the fires never got that hot.
BB&S found that the steel had undergone a high temperature chemical attack, not unlike road salt attacks the steel in your car. Only the reaction happened much, much faster because, like all these reactions, the speed up enormously at high temperatures.
The steel converted from nearly pure iron (with a tiny amount of carbon) to an iron-sulfide and aniron-oxide alloys.
Now, both iron sulfide & iron oxide also have melting temperatures around 1400°C (IIRC). They also would not melt in the debris pile fires.
But when iron-sulfide & iron-oxide mix, the mixture's melting temp will drop to about 950°C. This was the infamous "eutectic mixture" that melted.
Do you get it yet?
Iron-sulfide is NOT steel.
Iron-oxide is NOT steel.
A 50/50 mixture of iron-oxide & iron-sulfide is NOT steel.
No steel melted. Even if someone looks at a steel beam and sees holes in it. And misinterprets it (or informally states it) as "the steel melted", that statement is still not true.
It is immediately obvious that no steel melted, because you can still see the shape of the I-beam, even in the thinned down section. When steel melts, it does what every other liquid does: it puddles & assumes the shape of the container. The very fact that you could still see the I-beam shape immediately tells you that the steel did not melt.
Furthermore, there is precisely zero doubt that the reports of "eutectic melting", thinned down steel I-beams has precisely zero possibility of being associated with any sort of "thermite" or explosive demolition.
People with agendas have lied to you. When will you call upon the brains that you were given to let you see this fact?
tk
