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A709 Grade 50W

A709 Grade 50W is a weathering structural steel designed for bridges and other structural applications, offering good strength, weldability, and resistance to atmospheric corrosion.
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ASTM A709 Grade 50W is a high-strength, low-alloy structural steel that is primarily used in structural applications such as bridges. It is known for its enhanced atmospheric corrosion resistance, making it suitable for outdoor environments. Grade 50W refers to the minimum yield strength of 50,000 psi (345 MPa), and the “W” stands for weathering steel, indicating its ability to withstand exposure to weathering elements such as rain, snow, and atmospheric conditions. This steel grade is often used in bridge construction to provide durability and long-term performance, particularly in areas with high corrosion potential.
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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 Chrome Nickel Copper Vanadium
min - 0.75 - - 0.15 0.40 - 0.20 0.01
max 0.20 1.35 0.03 0.03 0.50 0.70 0.50 0.40 0.10
Mechanical Properties
- Yield Strength Tensile Strength Elongation (up to 2in) Elongation (up to 8in)
min 50 ksi [345 MPa] 70 ksi [483 MPa] 21% 18%

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