Learn About the Latest ASTM A709 Steel Plate/Sheet Price, Specifications and Dimensions.
ASTM A709 Grade 36 50 50W 70W Structural Steel Plate for Bridge Projects
High-Quality ASTM Standard Steel Plate
Royal Steel Group supplies ASTM A709 Grade 36, Grade 50, Grade 50W, and Grade 70W Steel Plates for bridge construction and heavy structural projects. Products meet ASTM A709/A709M standards with excellent strength, toughness, and weldability.
Customized Specifications & Processing
We provide customized steel plate solutions with various sizes, thicknesses, and processing services, including:
Cutting
Drilling
Surface treatment
Custom fabrication
Reliable Quality Control
Each astm a709 steel plate is strictly inspected with:
Chemical composition testing
Mechanical property testing
Mill Test Certificate (MTC)
Third-party inspection support
One-Stop Steel Supply Service
Beyond steel plates, Royal Steel Group supplies complete structural steel products, including:
H Beam
I Beam
Steel Pipe
Steel Profiles
Fabricated Steel Structures
Global Export Capability
With extensive international export experience, Royal Steel Group provides competitive pricing, stable supply, professional logistics, and complete documentation support for global construction projects.
Royal Steel Group delivers reliable ASTM a709 steel plate solutions for bridges, infrastructure, and heavy-duty structural applications worldwide.
| Item | Description |
| Product Name | ASTM A709 Grade 50 Steel Plate |
| Standard | ASTM A709 / A709M |
| Grade | Grade 50 |
| Type | High Strength Structural Steel Plate |
| Thickness | Customized according to project requirements |
| Width | Customized |
| Length | Customized |
| Production Process | Hot Rolled |
| Surface Treatment | Shot Blasting, Painting, Galvanizing (Optional) |
| Certification | MTC, SGS Inspection Available |
Chemical Composition (Typical Range)
ASTM A709 Grade 50 Steel Plate / Sheet Chemical Composition
| Element | Maximum / Range |
| Carbon (C) | ≤ 0.23% |
| Manganese (Mn) | ≤ 1.35% |
| Phosphorus (P) | ≤ 0.04% |
| Sulfur (S) | ≤ 0.05% |
| Silicon (Si) | ≤ 0.40% |
ASTM A709 Steel Plate / Sheet Mechanical Property
| Property | ASTM A709 Grade 50 |
| Yield Strength | ≥ 345 MPa (50 ksi) |
| Tensile Strength | 450–620 MPa |
| Elongation | ≥ 18% |
| Material Type | High Strength Low Alloy Structural Steel |
ASTM A709 Steel Plate/Sheet Sizes
| Parameter | Range |
| Thickness | 2 mm – 200 mm |
| Width | 1,000 mm – 2,500 mm |
| Length | 6,000 mm – 12,000 mm (custom sizes available) |
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ASTM A709 Grade 50 Steel Plate Production Process
Royal Steel Group follows strict quality control procedures throughout the manufacturing process of ASTM A709 Grade 50 Steel Plate to ensure excellent strength, toughness, weldability, and dimensional accuracy for bridge construction and heavy structural applications.
1. Raw Material Selection
High-quality steel billets and plates are sourced from reputable steel mills. Before processing, raw materials undergo testing, and the results meet the chemical composition and quality requirements of ASTM A709 standards.
2. Refining and Steelmaking
During the steelmaking process, molten steel maintains a certain protein content to precisely control the content of alloying elements such as carbon, manganese, silicon, phosphorus, and sulfur. Higher levels of refining improve the cleanliness, toughness, and performance of the final product.
3. Continuous Casting
The molten steel is cast into billets using a continuous casting process. Strict temperature and quality control ensures uniform billet microstructure and minimizes internal defects.
4. Hot Rolling
The billets are heated and rolled in a hot rolling mill, with dimensions and mechanical properties conforming to the ASTM A709 Grade 50 steel plate standard.
5. Optional Heat Treatment
Normalizing or controlled rolling treatments are available for the steel plates, depending on project requirements, to achieve the optimal balance of strength, toughness, weldability, and structural stability.
6. Finishing and Surface Treatment
Complete core material finishing services are provided, including leveling, splicing, cutting, trimming, shot peening, and surface inspection. If needed, surface anti-rust spraying can be performed to prevent rust and ensure dimensional accuracy.
7. Rigorous Quality Inspection
All tests are conducted strictly according to international standards, including: chemical composition analysis, tensile/yield strength testing, impact testing, ultrasonic testing (UT), and dimensional inspection. Official Material Testing Certificates (MTC) and third-party inspection reports are provided.
8. Standard Packaging and Delivery
Finished steel plates are packaged according to export standards to prevent damage during transportation. We also provide global shipping services for infrastructure and bridge projects.
ASTM A709 steel plate is a general-purpose high-strength low-alloy steel plate suitable for structural applications such as bridges and other heavy structures. Its combined advantages in strength, toughness, and weldability make it ideal for critical infrastructure projects.
Common Applications:
Bridge Construction Technology
Main Beams and Ribs
Bridge Deck Riveting
Orthotropic Bridge Deck
Highway, Railway, and Pedestrian Bridges
Large-scale Construction Projects
Factory, industrial buildings and warehouses
Giant cranes and booms
Transmission line towers and utility towers.
Marine and Offshore Structures
Docks and Berths
Offshore Platforms
Coastal Protection Structures
Other Specific Applications
Retaining wall construction
Heavy-load site protection
High-toughness, low-temperature resistant components
1) Branch Office - Spanish-speaking support, customs clearance assistance, etc.
2) Over 5,000 tons of stock in stock, with a wide variety of sizes
3) Inspected by authoritative organizations such as CCIC, SGS, BV, and TUV, with standard seaworthy packaging
| No. | Inspection Item | Description / Requirements | Tools Used |
| 1 | Document Review | Verify MTC, material grade, standards (ASTM/EN/GB), heat number, batch, size, quantity, chemical & mechanical properties. | MTC, order documents |
| 2 | Visual Inspection | Check for cracks, folds, inclusions, dents, rust, scale, scratches, pits, waviness, edge quality. | Visual check, flashlight, magnifier |
| 3 | Dimensional Inspection | Measure thickness, width, length, flatness, edge squareness, angle deviation; confirm tolerances meet ASTM A6/EN 10029/GB standards. | Caliper, tape measure, steel ruler, ultrasonic thickness gauge |
| 4 | Weight Verification | Compare actual weight with theoretical weight; confirm within allowable tolerance (typically ±1%). | Weighing scale, weight calcula |
1. Double-Layer Strapping Packaging
Steel plates are sorted and stacked uniformly by size and specification. Wooden or steel spacers are placed between each layer to keep the plate surface flat, avoiding direct contact and friction that may cause surface damage. The double-layer stacked plates are firmly fastened with three sets of steel straps. This strapping method delivers reliable overall stability during transit, effectively preventing plate displacement and loosening.
2. Wooden Crate & Pallet Packaging
Small-size and high-grade steel plates adopt wooden crate or pallet packaging. The inner side of the package is wrapped with rust-proof paper and plastic film to block moisture and resist rust formation. As a standard export packaging solution, it enables easy loading, unloading and stacking. Meanwhile, it fully meets IMO international shipping standards, suitable for long-distance ocean transportation and long-term marine storage.
3. Bulk Transport Packaging
Oversized steel plates are delivered via sea or land bulk transportation. Custom wooden cushion blocks and professional protective materials are installed at all contact stress points of the steel plates. The cushioning structure can well buffer compression and impact forces during shipment, prevent plate deformation, and fully protect the surface finish and structural integrity of the steel plates throughout the transportation process.
1. What is ASTM a709 steel plate?
High-strength structural steel plate for bridges and heavy infrastructure. Available in double/triple widths, fit for spinning & flanging. Features superior strength, hardness, toughness and weather resistance for outdoor & harsh environments.
2. Is astm a709 steel plate weldable?
Yes, compatible with conventional welding. Thick plates or low-temperature welding require preheating & post-weld heat treatment; stricter welding standards apply to weather-resistant grades.
Standard dimensions
Thickness: 6–250 mm; Max width: 4000 mm; Max length: 12000 mm; custom sizes available.
3. ASTM A709 vs ASTM A36
A709 delivers higher strength and toughness, ideal for bridges and heavy structures. A36 is for common general construction.
4. Required inspection tests
Tensile test, low-temperature impact test, chemical composition analysis, dimension & surface inspection.
5. Advantages of astm a709 steel sheet
Engineered for high-demand bridge and key infrastructure projects. Boasts high strength, reliable weldability and long service life, performing excellently under severe working conditions.
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