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Grade AASHTO M270 0.5 in. x 120 in. x 480 in. steel plate front view.
Grade AASHTO M270 0.5 in. x 120 in. x 480 in. steel plate right view.
Grade AASHTO M270 0.5 in. x 120 in. x 480 in. steel plate top view.

AASHTO M270 Structural Steel Plate

AASHTO M270 steel plate is a structural steel plate certified to meet American Association of State Highway and Transportation Officials specifications for use in vehicle bridges. Leeco® Steel stocks and supplies AASHTO M270 plate in Grades 50 and 50W.
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Features

  • 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.

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Product Details

Grade Thickness Width Length
AASHTO M270-50 3/16" – 4" 48" – 120" Up to 480"
AASHTO M270-50W 3/16" – 4" 48" – 120" Up to 480"
Grade Yield Point (ksi) Tensile Strength (ksi) Min. 8” Elongation %
50 50 65 18
50W 50 70 18
Carbon max 0.23%
Manganese max 1.35%
Phosphorus max 0.030%
Sulfur max 0.030%
Silicon, > 1 1/2" thick 0.15-0.40%
Silicon max, plates ≤ 1 1/2" thick 0.40%
Columbium 0.005-0.05%
Vanadium 0.01-0.15%
Carbon max 0.19%
Manganese 0.80-1.25%
Phosphorus max 0.030%
Sulfur max 0.030%
Silicon 0.30-0.65%
Copper 0.25-0.40%
Vanadium 0.02-0.10%
Chromium 0.40-0.65%
Nickel max 0.40%
Carbon max 0.20%
Manganese 0.75-1.35%
Phosphorus max 0.030%
Sulfur max 0.030%
Silicon 0.15-0.50%
Copper 0.20-0.40%
Vanadium 0.01-0.10%
Chromium 0.40-0.70%
Nickel max 0.50%

Multi-Certification

AASHTO M270 and ASTM A709 are closely related bridge steel specifications issued by different organizations. When material satisfies both specifications, steel plate can be dual-certified to meet both ASTM and AASHTO requirements, which is often requested for bridge fabrication projects. 

Product MTRs commonly also certify the plate for
AASHTO M270 ASTM A709

Grade Comparison

Frequently Asked Questions

Learn more about AASHTO M270 steel plate.
ASTM A709 is a steel plate specification used for bridge applications. AASHTO M270 is a similar bridge steel specification governed by the American Association of State Highway and Transportation Officials and is commonly used for vehicle bridge projects. The two specifications are closely related, so steel plate may be dual-certified to meet both ASTM A709 and AASHTO M270 when the material satisfies both standards.
AASHTO M270 steel plate is certified to meet American Association of State Highway and Transportation Officials specifications for use in vehicle bridges. It is commonly specified for bridge projects that require structural steel plate with defined strength, certification, Charpy testing or climate-related requirements.
M270 Grade 50 and M270 Grade 50W are both bridge steel grades with a 50 ksi yield strength level, but Grade 50W has enhanced atmospheric corrosion resistance. The “W” grade is typically considered when a bridge project requires improved resistance to atmospheric exposure.
Charpy impact testing may be required for AASHTO M270 steel plate depending on the bridge application, climate zone, project specification and fracture-critical or non-fracture-critical requirements. M270 grades can be specified to meet Charpy test requirements for specific zones and climates when the plate is ordered.