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  • Hangzhou FAMOUS Steel Engineering Company
    Donald Mcwayne
    Good team members always offer budget in time and answer questions with patience, great job!
  • Hangzhou FAMOUS Steel Engineering Company
    Joseph Alexander
    I am feeling fully respected when taking with Grace and she always gave the best advice. The first batch of the bridge panels got are great too. thanks all.
Contact Person : Tomy.Gao
Phone Number : +86-180 7273 5884
Whatsapp : +8618072735884

Heavy-Duty Box Girder Steel Bridge Made of ASTM A709 High Strength Structural Steel

  • Heavy-Duty Box Girder Steel Bridge Made of ASTM A709 High Strength Structural Steel
  • Heavy-Duty Box Girder Steel Bridge Made of ASTM A709 High Strength Structural Steel
  • Heavy-Duty Box Girder Steel Bridge Made of ASTM A709 High Strength Structural Steel
  • Heavy-Duty Box Girder Steel Bridge Made of ASTM A709 High Strength Structural Steel
Place of Origin China
Brand Name FASEC
Certification ISO 9001; EN 1090-1 FPC; CE; AWS CWI; AISC IBR/ABR
Model Number Steel Girder Bridge
Minimum Order Quantity 100 MT
Price USD 1,000-1,500/MT
Packaging Details Sea Freight (Container/Bulk Vessel)
Delivery Time 30-60 Days
Payment Terms L/C, D/A, D/P, T/T
Supply Ability 5,000-15,000 MT/Year
Product Details
Product Type Heavy-Duty Box Girder Steel Bridge Material Standard ASTM A709 / A709M
Corrosion Protection Weathering Steel (unpainted), Epoxy Coating, Hot-dip Galvanizing Fracture Control FCM Per AWS D1.5M Clause 12; Charpy V-notch Testing
Welding Inspection AWS-Certified Welding Inspectors (CWIs) Traceability Mill Test Reports (MTRs), Welding Quality Records
Application Highway Overpasses, Railway Crossings, Heavy-load Industrial Infrastructure Customization Custom Span, Width, Depth, Steel Grade, And Coating
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Product Description
The Heavy-Duty Box Girder Steel Bridge is a high-load-bearing steel bridge superstructure adopting professional ASTM A709 bridge-specific steel. With optional weathering steel grades and high-performance HPS steel, it features an outstanding strength-to-weight ratio and extreme durability. Custom engineered for highway overpasses, railway crossings and heavy-load industrial infrastructure, all bridges strictly comply with AASHTO LRFD design specifications and AWS D1.5M bridge welding standards to ensure stable and reliable long-term operation.
 

Material Advantage – ASTM A709​

 
Grade Yield Strength Key Feature
Grade 36 36 ksi Standard carbon structural steel for general bridge projects
Grade 50 50 ksi High-strength low-alloy steel for conventional heavy-load bridges
Grade 50W 50 ksi Weathering steel with excellent natural corrosion resistance
HPS 50W 50 ksi High-performance steel with superior toughness and weldability
HPS 70W 70 ksi Premium high-strength steel, 40% stronger than standard Grade 50
 
HPS 70W allows thinner plate design, reduces self-weight and effectively lowers foundation construction costs. A709 weathering steel forms a dense anti-corrosion layer naturally without paint coating, achieving 75–120 years maintenance-free service life under normal atmospheric environments.
 

Structural Performance


  • Excellent Torsional Stability: Closed box section resists torsion effectively, perfectly suitable for curved bridges and eccentric load working conditions.
  • Flexible Span Design: Single span: 6m–50m; continuous span: up to 8 spans.
  • Standard Load Capacity: Designed for HL-93 live load, fatigue load, thermal deformation and seismic load per AASHTO LRFD.
  • Economical Hybrid Structure: Matched with HPS 70W flanges and Grade 50W webs to balance structural performance and project cost.
  • Strict Fracture Control: Tension members are designed as FCM (Fracture-Critical Members) with standard Charpy V-notch toughness testing.
  • Full Composite Action: Factory pre-welded shear studs realize complete composite cooperation with concrete deck.
     

Key Specifications

 
 
Parameter Specification / Range
Material Grade ASTM A709 / A709M (36, 50, 50W, HPS 50W, HPS 70W)
Yield Strength 36 ksi – 70 ksi
Design Standard AASHTO LRFD
Welding Standard AWS D1.5M
Span Capacity 6m–50m (single span); max 8 continuous spans
Bridge Width 2m–24m (fully customizable)
Girder Depth 0.8m–3.5m
Corrosion Protection Weathering steel (unpainted), epoxy coating, hot-dip galvanizing
Design Life 75 – 120 years
​

Fabrication & Quality – AWS D1.5M Certified


  • Professional NDT Testing: 100% UT inspection for full-penetration tension welds; MT/PT testing for fillet welds and auxiliary welds.
  • Strict FCM Protocol: Implements AWS D1.5M Clause 12 standard, including enhanced inspection, Charpy V-notch testing and complete technical documentation.
  • Professional Supervision: All production procedures supervised by AWS-Certified Welding Inspectors (CWIs).
  • Full Traceability: Complete Mill Test Reports (MTRs) and integrated welding quality records provided.
  • Authoritative Inspection: Support third-party inspection by SGS, BV, TÜV and other international institutions.
     

Conclusion – Maximum Strength, Minimum Maintenance


Our ASTM A709 Heavy-Duty Box Girder Steel Bridge features ultra-high structural strength, natural anti-corrosion performance and low lifecycle maintenance costs. Adopting professional AASHTO & AWS standard fabrication, it adapts to various harsh environments and heavy-load working conditions.
We provide custom grade selection, personalized structural design and budget estimation according to your project span, load standard and site conditions. Contact us to get professional bridge engineering solutions for your infrastructure project.​
 
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