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A709 Grade 50

ASTM A709 Grade 50 is a high-strength structural steel plate designed for bridge construction and other demanding structural applications, offering excellent strength, durability, and weldability.
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ASTM A709 Grade 50 is a high-strength structural steel plate manufactured to meet the requirements of ASTM A709/A709M for structural steel used in bridges. With a minimum yield strength of 50 ksi (345 MPa), it provides greater strength than Grade 36 while maintaining good weldability and durability. A709 Grade 50 is commonly used for bridge girders, structural components, highway infrastructure, and other applications where high strength and reliable performance are required. Its combination of strength, toughness, and weldability makes it a suitable choice for demanding structural projects.
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Typical specification data

Technical reference

Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.

Chemical Properties
% Carbon Manganese Phosphorus Sulfur Silicon Copper Niobium + Vanadium
min - - - - - 0.2 0.005
max 0.23 1.35 0.03 0.03 0.4 - 0.05
Mechanical Properties
- Yield Strength Tensile Strength Elongation (up to 2in) Elongation (up to 8in)
min 50 ksi [345 MPa] 65 ksi [448 MPa] 21% 18%

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