751.3 Structural Steel Design Properties

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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
GradeMinimum Yield Strength, \,F_y(ksi)MaximumPlateThickness(inches)Shapes
36364 (*)All
50504All
50W504All
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
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