751.3 Structural Steel Design Properties
Structural Steel (AASHTO M270/ASTM A709)
All structural steel will be AASHTO M270/ASTM A709 Grade 36 (Fy = 36 ksi) or Grade 50 (Fy = 50 ksi) except where weathering steel (AASHTO M270/ASTM A709 Grade 50W steel) is indicated on the Design Layout or in special cases. Welded or seamless steel shell (pipe) for CIP pile will be ASTM A252 Modified Grade 3 (Fy = 50 ksi). For pipe common available nominal wall thicknesses, see EPG 751.36.2.2.2. See Project Manager for use of structural steel with Fy greater than 50 ksi.
Note: ASTM A709 Grade 50S shall not be specified for HP piles or other structural shapes without prior confirmation of the availability of the material.
| Grade | Minimum Yield Strength, Fy, ksi |
Maximum Plate Thickness, inches |
Shapes |
|---|---|---|---|
| 36 | 36 | 41 | All |
| 50 | 50 | 4 | All |
| 50W | 50 | 4 | All |
| HPS70W | 70 | 2" TMCP2 | N/A |
| 4" Q&T3 | |||
| 1 Thickness of plate up to 8 inches may be used when fabricating bearings using ASTM A709 Grade 36 steel. | |||
| 2 TMCP, Thermo Mechanical Controlled Process | |||
| 3 Q&T, Quenched & Tempered | |||