Structural, Carbon & HSLA Steel Plate

A709 Grade 36, Grade 50, Grade 50W
A709 is the specification used for steel plate used in the manufacture of bridges. Chapel Steel stocks A709 Grade 36, A709 Grade 50 and A709 Grade 50W. These grades are often specified with charpy tests referencing the specific zone (or climatic region) in which the bridge will be in use. The charpys are specified as non-fracture critical which is a per heat test (frequency “H”), or fracture critical which is a per plate test (Frequency “P”). Bridge steels can also be ordered to the ASSHTO M270 Spec referenced as AASHTO M270 Grade 36, AASHTO M270 Grade 50, AASHTO M270 Grade 50W.

Mechanical Properties 709 Gr 36:
Tensile: 58 to 80 ksi
Yield: 36 ksi min
Elongation: 18% min in 8” 21% min in 2”

Mechanical Properties 709 Gr 50:
Tensile: 58 min ksi
Yield: 50 ksi min
Elongation: 16% min in 8” 19% min in 2”

Mechanical Properties 709 Gr 50W:
Tensile: 65 min ksi
Yield: 50 ksi min
Elongation: 16% min in 8” 19% min in 2”