structural steel

from WordNet (r) 3.0 (2006)

structural steel
    n 1: a strong steel that is rolled into shapes that are used in
         construction

from The Collaborative International Dictionary of English v.0.48

Structural steel \Structural steel\
   (a) Rolled steel in structural shapes.
   (b) A kind of strong mild steel, suitable for structural
       shapes.
       [Webster 1913 Suppl.]