Posted by Kaegi [76.22.23.236] on Wednesday, December 23, 2015 at 19:21:50 :
In Reply to: Re: Mack Trucks OT posted by Franz [24.149.37.138] on Wednesday, December 23, 2015 at 14:48:14 :
Contemporaneous construction documents indicate that the lowest strength exterior wall column steels were supplied to the ASTM A 36 standard, but all the steels with strengths above that value conformed to proprietary grades that the Port Authority of New York and New Jersey, the building owner, authorized. Yawata Iron and Steel, now Nippon Steel, supplied most of the steel plate for the exterior wall columns. The plate that faced the interior of the building usually came from a domestic mill, however.
Japanese and British mills supplied most of the steel for the core columns. These plates and hot-rolled, wide-flange shapes were mostly FY = 36 ksi ASTM A 36. Little information survived about which steel mills supplied the core beams.
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