Abstract
Microstructural examination of a beam from Building 7 showed that temperatures higher than 940 °C were experienced in localized regions. Concurrent examination of the beam surfaces and surface layers showed evidence of extensive metal removal, and the analysis suggests that this removal occurred while the beam was exposed to the fire in the rubble pile after the building had collapsed.
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Sisson, R.D., Biederman, R.R. Metal removal via slag attack of the steel from building 7 of the world trade center—Some observations. J Fail. Anal. and Preven. 6, 17–21 (2006). https://doi.org/10.1361/154770206X129006
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DOI: https://doi.org/10.1361/154770206X129006