There is no good reason to believe that the molten material seen dripping on 9/11 and found in the debris piles was melted steel generated in thermitic reactions during a controlled demolition. Aluminum from the airplanes and buildings makes much more sense, as it can glow bright orange at the temperatures present in building fires.
No testing ever confirmed the presence of molten steel, and the WTC "meteorites" contain visible chunks of still-solid steel. Building fires are more than capable of deforming steel beams, whereas neither thermite nor explosives would act in this way. Finally, high surface temperatures can't be used to infer the presence of below-ground pools of molten steel, and the shifting nature of these hot-spots indicates that fires were responsible.