I don't have to look it up to know that the twin towers had to use Pure iron in its construction

First published at 08:50 UTC on July 31st, 2019.
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CORRECTION! NOT nickel steel , , the twin towers had low carbon A36 structural steel beams with a typical chemical composition of 98% Iron, 1% Manganese, .3% Carbon, .28% Silicon, .2%Copper
BUT they are NOT graded by chemical composition , but by…

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CategoryEducation
SensitivityNormal - Content that is suitable for ages 16 and over
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