Journal of Failure Analysis and Prevention

, Volume 6, Issue 5, pp 17–21 | Cite as

Metal removal via slag attack of the steel from building 7 of the world trade center—Some observations

  • R. D. SissonEmail author
  • R. R. Biederman
Case History


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.


Building 7 microstructure rubble pile slag sulfur temperature 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J.R. Barnett, R.R. Biederman, and R.D. Sisson, Jr: “An Initial Microstructural Analysis of A36 Steel from WTC Building, 7,”JOM-J. Min. Met. Mat. S, Dec 2001, pp. 18.Google Scholar
  2. 2.
    J.R. Barnett, R.R. Biederman, and R.D. Sisson, Jr.: “World Trade Center Building Performance Study: Data Collection, Preliminary Observations and Recommendations,” FEMA Report 403, Federal Emergency Management Agency, Federal Insurance and Mitigation Administration, Washington, DC, Apr 2002, Appendix C: “Limited Metallurgical Examination.”Google Scholar
  3. 3.
    W. Callister:Materials Science and Engineering, An Introduction, 5th ed., John Wiley & Sons, 2000.Google Scholar
  4. 4.
    P. Asanti and E. Kohlmeyer:Z. Anorg. Chem., 1951, {vn265}({sn94}).Google Scholar
  5. 5.
    R.R. Biederman, E. Sullivan, and R.D. Sisson, Jr., Worcester Polytechnic Institute, and G.F. Vander Voort, Buehler: “Microstructural Analysis of the Steels from Buildings 7, 1 and 2 from the World Trade Center,” private communication.Google Scholar

Copyright information

© ASM International - The Materials Information Society 0247 V 2 2006

Authors and Affiliations

  1. 1.Materials Science and Engineering ProgramWorcester Polytechnic InstituteWorcester

Personalised recommendations