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 ( = 36 ksi) or Grade 50 ( = 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 greater than 50 ksi.

Available Material
Grade Minimum Yield Strength, (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