AASHTO M270 Structural Steel Plate

Leeco® Steel stocks and supplies AASHTO M270 structural steel plate.


  • Certified to meet the American Association of State Highway and Transportation Officials (AASHTO) specifications for use in vehicle bridges.
  • Available in two grades: 50 and 50W.
  • Guaranteed to meet AASHTO M270 specifications, but may also be dual certified with similar ASTM grades.
  • Charpy test requirements for specific zones and climates may be requested.


Available Sizes

Leeco Steel stocks the following standard sizes, but other sizes may be available for special orders.

M270 50 & 50W 3/16" – 4" 48" – 120" Up to 480"

Material Properties

The following material properties are ASTM specifications and will be confirmed on the Mill Test Report.

Grade Yield Point (ksi) Tensile Strength (ksi) Min. 8” Elongation %
50 50 65 18
50W 50 70 18

Chemical Composition

Please reference ASTM A709 for similar material composition specifications.