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AASHTO M270 Structural Steel Plate
Leeco® Steel stocks and supplies AASHTO M270 structural steel plate.
Overview:
- 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.
| GRADE | THICKNESS | WIDTH | LENGTH |
| 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
The following composition properties are ASTM specifications for the ASTM A709 grades. Note that the composition of chemicals ranges depending on the thickness of the material.
| Grade 50 (max 4" thick) | |
| Carbon max | 0.23% |
| Manganese max | 1.35% |
| Phosphorus max | 0.030% |
| Sulfur max | 0.030% |
| Silicon | 0.15-0.40% |
| Columbium | 0.005-0.15% |
| Vanadium |
0.01-0.15% |
| Grade 50W | Type A | Type B |
| Carbon | 0.19% max | 0.20% max |
| Manganese | 0.80-1.25% | 0.75-1.35% |
| Phosphorus | 0.030% max | 0.030% max |
| Sulfur | 0.030% max | 0.030% max |
| Silicon | 0.30-0.65% | 0.015-0.50% |
| Nickel | 0.40% max | 0.50% max |
| Chromium | 0.40-0.65% | 0.40-0.70% |
| Copper | 0.25-0.40% | 0.20-0.40% |
| Vanadium | 0.02-0.10% | 0.01-0.10% |
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