A709-50 W Beams

Kloeckner Metals proudly stocks A709 W beams, a popular high-strength low-alloy structural steel product chiefly used in bridge construction.

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Typical Standards

FormatSize range
W beams4" x 13# - 44" - 335"

General Info About A709 W Beams

There are over 600,000 bridges in the U.S. and A709 W beams is one of the primary structural steels used to build them. What makes this structural steel grades one of the most popular beams in modern construction?

The shape. W beams, or wide flange beams, have signature parallel flange surfaces, longer widths than S beams, and they span up to 355 feet. They also have the most standard sections available.

Weathering capabilities and high strength. These are two key considerations for bridge fabrication. The ASTM A709-50W structural steel product grade is a high-strength low alloy (HSLA) steel that demonstrates atmospheric corrosion resistance better than many steels with a corrosion index of 6.0 and higher, while providing a minimum tensile strength of 70 ksi. As a result, A709’s superb mechanical properties offer critical support to pedestrian bridges, railroad bridges, overpasses, highway bridge girders, and other bridge components.

Notch toughness. ASTM A709-50W requires a Charpy V-Notch impact test to further ensure non-fracture and fracture critical properties.

More Details About A709 W Beams

  • Advantages/Disadvantages

    Above average atmospheric corrosion resistance, high strength, and impact resistance make up the main advantages of ASTM A709 50W steel beams. They are most advantageous in the building of bridges and bridge components. This structural steel product grade can run higher in cost. It has fair joining and formability characteristics.

  • Industries

    This structural steel product grade is almost exclusively used to fabricate bridges and bridge components. It’s increasing popularity in the solar industry, as the demand for solar paneling surges to meet new emissions standards.

  • Applications

    Bridge construction and bridge components are the most common application for this structural steel product grade. When it is seen in the solar industry, this structural steel product forms the basis of support as solar panel posts.

  • Machining

    This structural steel product has fair machinability.

  • Welding

    A709 W beams have excellent weldability.

  • Heat Treatment

    Heat treatment is not required for this structural steel product grade.

Chemical Properties

0.19%0.25 - 0.40%0.03%08 - 1.25%0.03%0.3 - 0.65%0.02%0.40%0.40% - 0.65%

Mechanical Properties

Mechanical Properties Grade 50
Tensile Strength, Ultimate450-485 MPa65,400 -70,300 psi
Tensile Strength, Yield345 MPa50,000 psi
Elongation at Break (in 200 mm)18.0%18.0%
Elongation at Break (in 50 mm)21.0%21.0%

Frequently Asked Questions About A709 W Beams

  • What is w shape steel beam?


    W-beams are a type of I-beam. They have a few signature characteristics, including parallel legs at wider lengths than the standard S beam. For this reason, they are also called Wide Flange Beams.

  • What is ASTM A709 steel?


    ASTM International, The American Society for Testing and Materials sets the standard specifications for metal grades. ASTM A709 is a standard specification for structural steel in bridges with weathering capabilities.

  • What does the w stand for in beams?


    The W stands for wide, and refers to the width of the legs.

  • What is stronger I-beam or w-beam?


    W-beams are a type of I-beam. They tend to carry more weight given their wider flanges. However, this can make it much heavier than the standard S beam.

  • Are A709 beams used in the solar industry?


    A709 beams are increasingly used in the solar industry. They make up the steel posts that support the heavy panels on the ground.

Services provided to A709-50 W Beams products

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Branches featuring A709-50 W Beams products

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