I see you didn't learn your lesson last time and now your back to get owned again. Well I'm more than happy to own your ignorant ass every time you show up in here, fool.
Let me explain the paper to you in more detail so you can comprehend exactly why the steel didn't melt, even on a microscopic level. Maybe I can dumb it down enough so even YOU can grasp it?
Here is the important statement in the paper:
Evidence of a severe high-temperature corrosion attack on the steel, including oxidation and sulfidation with subsequent intergranualar melting, was readily visible in the near-surface microstructure.
First some definitions are in order:
Oxidation - In the case of steel this simply means rusting.
Sulfidation - This is an accelerated oxidation process caused by the presence of sulfide and/or sulfate compounds. Salt is a common compound that causes sulfidation. That's why cars that are exposed to salted roads during wintertime in the north tend to rust faster than cars that are not exposed to such conditions.
Intergranular melting - All formed steel has a grain structure of which there are various types. This structure is determined by the alloy composition, the production process (like forging, hot rolling, cold rolling, etc), and subsequent post-treatments such as quenching and various heat treatments. The actual steel is contained in the grains of the structure. Between the grains (intergranular) there are various elements (carbon, copper, manganese, etc.) that help to hold the steel grains together and impart specific properties to the steel alloy as a whole.
So what happened to the steel?
First the beam oxidized. iow, it rusted. Then there was a sulfidation attack which accelerated the rusting process. After that there was intergranular melting. The compounds between the steel grains liquified, likely due to contact with the eutectic compound, which was a formation between the sulfur salts (sufides and sulfates), rust (iron oxide), and the high-temperatures.
No actual steel melted in this process. Of course, you have to understand the mechanisms and processes in the first place to comprehend that fact and clearly neither you or the rest of the truther dumbasses seem to have that capability.
btw, I'd like to mention another issue. If you concede that the "melting" only happened in the near surface microstructure, and on microscopic levels, how do you now explain where all that "molten steel" came from? Microscopic amounts of melting surely couldn't account for pools and rivers of molten steel. So where did it come from? Do tell?
Additionally, if thermite was used, as you claim, why was no post-reaction residue detected in the FEMA tests? There should have been copious amounts of aluminum oxide. Where is it?
Face it kid. You're way out of your element because you have no critical thinking skills and you don't have the knowledge or education to employ critical thinking on this subject in the first place. That why you have to use deception and dishonesty, along with exhibiting the behaviour of a grade-school child, when you post your truther bs.
Feel free to keep it up though. Folks like you are the best advertising to demonstrate why truthers are so full of shit.