Fire caused the corrosion. Some people are fooled by 911 truth to think this melted, but it corroded in fires at or below 1000C. Steel melts at = 1425 - 1540 C ; what kind of steel was in the WTC?
There are no photos of melted steel, this photo fools those who can't read the study of this steel, Appendix C, it says corroded, not melted. The paper talks about eutectics, and that helps 911 truth liars to fool lay people who never took a Chemical Engineering course into believing the delusional fantasy of melted steel at the WTC.
Study of the steel shows damage at 1000C, this is the sample with the highest exposure, 1000C. Now what?
Oops, corrosion, not melted.
http://www.fema.gov/pdf/library/fema403_apc.pdf
Don't worry, 911 truth can quote mine "melt" from the five times "melt" occurs in the paper, and make up the lie of melted steel. It is what 911 truth does, no science just talk. Paper proves the steel did not melt, but you can quote mine it and make up nonsense.
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