751.3 Structural Steel Design Properties

751.3.1 Structural Steel (AASHTO M270/ASTM A709)

All structural steel will be AASHTO M270/ASTM A709 Grade 36 ($\,F_{y}$ = 36 ksi) or Grade 50 ($\,F_{y}$ = 50 ksi) except where weathering steel (AASHTO M270/ASTM A709 Grade 50W steel) is indicated on the Design Layout or in special cases. See Project Manager for use of structural steel with $\,F_{y}$ greater than 50 ksi.

Available Material

Grade	Minimum Yield Strength, $\,F_{y}$(ksi)	MaximumPlateThickness(inches)	Shapes
36	36	4 (*)	All
50	50	4	All
50W	50	4	All
HPS70W	70	2" TMCP (**)	N/A
		4" Q & T (***)

(*) Thickness of plate up to 8 inches may be used when fabricating bearings using ASTM A709 Grade 36 steel.

(**) TMCP, Thermo Mechanical Controlled Process

(***) Q&T, Quenched & Tempered