Section 27-615. Identification

Structural steel that is required to have a
  minimum yield point greater than thirty-six thousand psi  shall  at  all
  times  in  the  fabricator's  plant, be marked, segregated, or otherwise
  handled  so  that  the  separate  alloys  and  tempers  are   positively
  identified,  and  after  completion  of  fabrication, shall be marked to
  identify the alloy  and  temper.  Such  markings  shall  be  affixed  to
  completed  members  and  assemblies  or to boxed or bundled shipments of
  multiple units prior to shipment from the fabricator's plant.  Open  web
  steel  joists  shall  have identification affixed to each bundle or lift
  showing size and type.