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Reply to people who say jet fuel can't melt steel
Posted by: Future Engineer ()
Date: August 07, 2006 01:59PM
This is a response to the discussion carried out by many suggesting that the planes at the WTC couldn't have brought the buildings down. I'm sorry for being so forward, but in my opinion this is a ridiculous discussion. I am a junior at an engineering-exclusive school studying materials engineering. I admit that I am not an "expert" on the subject. However, I do know enough to explain this situation. The actual maximum burning temperature of a Jet-A fuel (standard jet fuel type in U.S.) is 980 deg. Celsius. If you refer to the Iron-Iron Carbide phase diagram, the temperature at which steel changes from cementite and pearlite (strong phases of steel) to austenite (significantly less strong) is 702.5 deg. Celsius. Also, if a steel structure is exposed to a temperature just below or at the eutectic (702.5 deg.) for a period of time, martinsite is formed (very weak). All it would take is a few I-beams to lose their structural integrity before the "chain reaction" would start. I don't have a strong opinion on the conspiracy theory, but when people say that the heat from burning jet fuel cannot melt steel it bothers me. It doesn't have to "melt" for it to become ineffective. Also, "very strong type of steel" is the most relative statement ever. The steel used in sky scrapers is a standard carbon steel, not heavily alloyed. In any case, the iron-iron carbide phase diagram describes all carbon steels very accurately. Also, when the buildings actually collapsed, all that potential energy was released into heat and sound, which is true for all destructive reactions. So it is quite possible that after the buildings fell, the temperature of the rubble reached levels higher than any fire could produce. Sorry, I’m done ranting.
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The issue is that the fuel was mostly consumed entirely during the impact/explosion and it can not answer for the ridiculous pancake theory, or the lack of toppling.
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