Details about ASTM A709/A709M Grade 50S Carbon and Low-alloy High-strength Steel Coil

Chemical Composition and Mechanical Properties of ASTM A709 Grade 50S Steel

Chemical Composition:

Element Percentage
C 0.19% Max
Mn 0.80 – 1.25%
P 0.030% Max
S 0.030% Max
Si 0.30 – 0.65%
Cu 0.25 – 0.40%

Mechanical Properties:

Property Metric Imperial
Tensile Strength (min) 485 MPa 65 ksi
Yield Strength (min) 345 MPa 50 ksi
Elongation in 200mm/8″ 18% 18%
Elongation in 50mm/2″ 21% 21%

Applications and Uses in Bridge Construction

ASTM A709 Grade 50S steel is primarily used in:

  • Bridge girders and components
  • Structural members in bridge building
  • Highway and railroad bridges
  • Pedestrian bridges

Manufacturing Process and Available Dimensions

Available dimensions for ASTM A709 Grade 50S steel:

Thickness Width Length
0.1875 to 3 inch 72 to 120 inch 240 to 1200 inch

Comparison of ASTM A709 Grade 50S with Other Grades

Grade Yield Strength (min) Tensile Strength (min) Corrosion Resistance
50 50 ksi (345 MPa) 65 ksi (450 MPa) Standard
50S 50 ksi (345 MPa) 65 ksi (450 MPa) Enhanced
50W 50 ksi (345 MPa) 70 ksi (485 MPa) Improved

Corrosion Resistance and Weathering Properties

ASTM A709 Grade 50S offers enhanced corrosion resistance compared to standard grades. It is suitable for use in environments where additional corrosion protection is required.

Welding and Fabrication Considerations

ASTM A709 Grade 50S steel has excellent weldability and can be welded using conventional methods. It has fair machinability and formability, requiring more force for forming compared to plain carbon steels.At HL Steel Company, we offer high-quality ASTM A709 Grade 50S steel coils tailored for bridge construction and other structural applications, ensuring optimal performance and durability for your projects.

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