Learn About the Latest ASTM A709 Steel Plate/Sheet Price, Specifications and Dimensions.
ASTM A709 Grade 50 Steel Plate High Strength Structural Steel Plate Supplier for Bridge Construction
Royal Steel Group is a a709 rolled plate supplier, dedicated to providing optimal solutions for high-quality structural steel plates for bridge construction, infrastructure, and heavy engineering applications worldwide.
1. Reliable ASTM Standard Quality
Royal Steel Group's ASTM A709 Grade 50 steel plates are manufactured strictly according to international standards, possessing excellent mechanical properties, weldability, and structural stability to meet the most demanding construction application requirements.
Compliant with A709/A709M standards
Uniform chemical and physical properties
Materials Testing Certificate (MTC) available
Third-party testing services available upon request.
2. Customized Steel Plate Solutions
Not all bridge and infrastructure construction projects have the same requirements. Royal Steel Group offers the following customization services:
Custom thickness, dimensions, and length
CNC cutting and steel plate processing
Surface treatment solutions
Project-based production solutions
3. Strong Supply Chain Capabilities
Royal Steel Group has established a stable steel supply network, ensuring timely delivery of mass production for large-scale collaborative projects.
Continuous large-volume supply of steel plates
Extensive steel product line
Highly competitive factory prices
Reasonable production schedule
4. Professional export experience
Royal Steel Group possesses extensive experience in supplying overseas steel products, enabling us to provide your company with comprehensive export services.
Professional export documentation
Quality inspection arrangements
Safe packaging
Global logistics solutions
5. Everything you need for structural steel
Royal Steel Group offers a full range of structural steel products, including fully articulated box culverts, high-performance flat ducts, 10 types of JIS hot-rolled commercial steel plates, cold-rolled steel coils, and grade II steel ladles, meeting diverse engineering needs.
Structural steel plates
H-beams
Steel columns
Steel pipes
Steel structural components
From steel supply to processing and delivery, Royal Steel Group provides one-stop steel solutions for bridge and construction projects 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) |
Click the Button on The Right
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 or slabs are selected from reliable steel mills. The raw materials are inspected to ensure they meet ASTM A709 chemical composition and quality requirements before production.
2. Steelmaking and Refining
During steelmaking, precise control of alloying elements such as carbon, manganese, silicon, phosphorus, and sulfur is maintained. Advanced refining processes help improve steel cleanliness, toughness, and overall performance.
3. Continuous Casting
The molten steel is cast into slabs through a continuous casting process. Strict temperature and quality control are applied to ensure uniform structure and minimize internal defects.
4. Hot Rolling
The steel slabs are heated and processed through high-temperature rolling mills to achieve the required thickness, width, and mechanical properties of ASTM A709 Grade 50 Steel Plate.
5. Optional Heat Treatment
Normalization or controlled rolling is adopted per project demands to optimize the plate’s strength, toughness, weldability and structural stability.
6. Finishing & Surface Treatment
Complete core finishing procedures including leveling, cutting, edge trimming, shot blasting and surface inspection. Anti-corrosion coating is available on request to ensure flat surface and precise dimensions.
7. Strict Quality Inspection
Full testing is conducted in line with international standards, covering chemical composition analysis, tensile/yield strength test, impact test, ultrasonic testing (UT) and dimensional inspection. Official MTC and third-party inspection reports are provided.
8. Standard Packaging & Delivery
Finished plates are packed per export standards to avoid transportation damage, supporting global shipping for infrastructure and bridge engineering 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 selected and stacked according to size and specifications. Wooden or steel pads are used between layers to keep the plates flat and prevent surface contact and friction. All double-layer strapping is tightly secured with three steel straps, sufficient to ensure stability during transportation and prevent the plates from sliding or loosening.
2. Wooden Crate and Pallet Packaging
Small-sized, high-quality steel plates are packaged in wooden crates or pallets. The packaging is lined with rust-proof paper and plastic film to prevent moisture and rust. This standard export packaging method facilitates loading, unloading, and stacking, and complies with the International Maritime Organization (IMO) requirements for international transport and long-term storage at sea.
3. Bulk Transport Packaging
Large-sized steel plates are transported in bulk by sea or land. Wooden cushioning blocks and specialized protective materials are placed at the contact points of the steel plates. This packaging has the ability to prevent deformation during transportation: "It effectively cushions the compression and impact during transportation, protecting the integrity of the steel plate surface and the entire structure."
Stable cooperation with shipping companies such as MSK, MSC, COSCO efficiently logistics service chain, logistics service chain are we to your satisfaction.
We follow the standards of quality management system ISO9001 in all procedure, and have strict control from packaging material purchase to transport vehicle scheduling.
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.
Write your message here and send it to us
