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Structural Steel Material Specification

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Just a quick note regarding the current standard for specifcation of 
structural steel.  The following is what AISC recommends engineers to specify 
on the drawings:  (mainly because mills don't produce A36 wide flange shapes 
any longer)

 A572 GR50 (per technical bulletin #3) for wide flange shapes

A36 for plates, channels, and angles.

note that A572 can be specified for plate if needed by design.

Technical bulletin #3 essentially limits the yield to tensile ratio.

Hope this info helps

Lanny J. Flynn S.E.