Learn About the Latest ASTM A709 Steel Plate/Sheet Price, Specifications and Dimensions.
ASTM A709 Structural Steel Plate | Heavy Hot Rolled MS Plate | Black HR Steel Plate for Bridge Construction
| Product Specifications | Processing Capability | Quality Assurance | Supply & Service |
| Full Grade & Size Coverage ASTM A709 Gr.36 / Gr.50 / Gr.50W available. Thickness 6–200mm, custom sizes supported to fit various infrastructure projects. | One-stop Custom Processing Professional cutting, drilling, welding and CNC machining services. Precision finished parts for direct on-site installation. | International Authoritative Certification ISO 9001 certified. Third-party inspected by SGS, BV, TUV. MTC EN10204 3.1 provided for every batch. | Project-oriented Application Ideal for bridge construction, municipal infrastructure and heavy steel structure works with excellent weather resistance and stability. |
| Large In-stock Supply Mass spot inventory of standard A709 steel plates, supporting bulk orders and urgent project demands. | High-precision Manufacturing Strict dimensional tolerance control and smooth surface treatment, ensuring high construction accuracy and structural safety. | Full-process Traceable Quality Strict raw material inspection and whole production monitoring, zero quality risk for global engineering projects. | Fast Delivery & Global Export 7–15 days fast shipment. Rich international export experience, supporting stable global project supply. |
| Item | Details |
| Material Standard | ASTM A709 |
| Grade | Grade 36, Grade 50, Grade 50W, Grade HPS 70W, Grade HPS 100W |
| Typical Width | 1,000 mm – 2,500 mm |
| Typical Length | 6,000 mm – 12,000 mm (customizable) |
| Tensile Strength | 400–895 MPa (85–130 ksi) |
| Yield Strength | 250-690 MPa (36-100 ksi) |
| Advantage | High Strength, Excellent Toughness, and Superior Durability for Bridge and Structural Applications |
| Quality Inspection | Ultrasonic Testing (UT), Magnetic Particle Testing (MPT), ISO 9001, SGS/BV Third-Party Inspection |
| Application | Bridges, Highways, and Heavy Structural Applications Requiring High Strength and Durability |
| Item | Details |
| Material Standard | ASTM A709 |
| Grade | Grade 36, Grade 50, Grade 50W, Grade HPS 70W, Grade HPS 100W |
| Typical Width | 1,000 mm – 2,500 mm |
| Typical Length | 6,000 mm – 12,000 mm (customizable) |
| Tensile Strength | 400–895 MPa (85–130 ksi) |
| Yield Strength | 250-690 MPa (36-100 ksi) |
| Advantage | High Strength, Excellent Toughness, and Superior Durability for Bridge and Structural Applications |
| Quality Inspection | Ultrasonic Testing (UT), Magnetic Particle Testing (MPT), ISO 9001, SGS/BV Third-Party Inspection |
| Application | Bridges, Highways, and Heavy Structural Applications Requiring High Strength and Durability |
Chemical Composition (Typical Range)
ASTM A709 Steel Plate/Sheet Chemical Composition
| Element | Grade 36 | Grade 50 / 50S | Grade 50W (Weathering) | HPS 50W / HPS 70W |
| Carbon (C) | ≤ 0.23% | ≤ 0.23% | ≤ 0.23% | ≤ 0.23% |
| Manganese (Mn) | 0.80–1.35% | 0.85–1.35% | 0.85–1.35% | 0.85–1.35% |
| Silicon (Si) | 0.15–0.40% | 0.15–0.40% | 0.15–0.40% | 0.15–0.40% |
| Phosphorus (P) | ≤ 0.035% | ≤ 0.035% | ≤ 0.035% | ≤ 0.035% |
| Sulfur (S) | ≤ 0.040% | ≤ 0.040% | ≤ 0.040% | ≤ 0.040% |
| Copper (Cu) | 0.20–0.40% | 0.20–0.40% | 0.20–0.50% | 0.20–0.50% |
| Nickel (Ni) | – | – | 0.40–0.65% | 0.40–0.65% |
| Chromium (Cr) | – | – | 0.40–0.65% | 0.40–0.65% |
| Vanadium (V) | ≤ 0.08% | ≤ 0.08% | ≤ 0.08% | ≤ 0.08% |
| Columbium/Niobium (Nb) | ≤ 0.02% | ≤ 0.02% | ≤ 0.02% | ≤ 0.02% |
ASTM A709 Steel Plate/Sheet Mechanical Property
| Grade | Tensile Strength (MPa) | Tensile Strength (ksi) | Yield Strength (MPa) | Yield Strength (ksi) |
| A709 Grade 36 | 400–552 MPa | 58–80 ksi | 250 MPa | 36 ksi |
| A709 Grade 50 | 485–620 MPa | 70–90 ksi | 345 MPa | 50 ksi |
| A709 Grade 50S | 485–620 MPa | 70–90 ksi | 345 MPa | 50 ksi |
| A709 Grade 50W (Weathering Steel) | 485–620 MPa | 70–90 ksi | 345 MPa | 50 ksi |
| A709 HPS 50W | 485–620 MPa | 70–90 ksi | 345 MPa | 50 ksi |
| A709 HPS 70W | 570–760 MPa | 80–110 ksi | 485 MPa | 70 ksi |
| A709 HPS 100W | 690–895 MPa | 100–130 ksi | 690 MPa | 100 ksi |
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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1.Raw Material Selection
High-quality iron ore or scrap steel is chosen to ensure the chemical composition meets ASTM A709 requirements.
2.Steelmaking
Basic Oxygen Furnace (BOF) or Electric Arc Furnace (EAF) methods are used to melt the raw materials.
Alloying elements such as manganese, silicon, copper, nickel, and chromium are added to achieve the desired grade and properties.
3.Casting
The molten steel is cast into slabs using continuous casting or ingot casting methods.
4.Hot Rolling
Slabs are heated to high temperatures (~1200°C) and rolled into plates of the required thickness and width.
Controlled rolling and cooling enhance mechanical properties like yield strength and toughness.
5.Heat Treatment (if required)
Some grades (e.g., HPS) may undergo quenching and tempering to improve strength, toughness, and weldability.
6.Surface Treatment
Plates are descaled (pickling, shot blasting) to remove oxide layers and prepare for further processing or coating.
7.Cutting and Finishing
Plates are cut to specified sizes, inspected, and tested for mechanical properties, chemical composition, and dimensional accuracy according to ASTM A709 standards.
8.Quality Control & Inspection
Each plate undergoes rigorous testing:
Tensile & yield strength tests
Charpy impact tests
Ultrasonic or ultrasonic testing for internal defects
Dimensional and surface inspection
9.Packaging & Delivery
Finished plates are bundled, labeled, and prepared for shipment to customers or construction sites.
STM A709 steel plates are primarily high-strength, low-alloy structural steel plates designed for use in bridges and other heavy structural applications. Their combination of strength, toughness, and weldability makes them ideal for critical infrastructure projects.
Common Applications:
Bridge Construction
Main girders and stringers
Deck plates
Orthotropic bridge decks
Highway, railway, and pedestrian bridges
Heavy Construction Projects
Industrial buildings and warehouses
Large-scale cranes and support structures
Transmission towers and utility structures
Marine and Offshore Structures
Piers and wharves
Offshore platforms
Coastal protective structures
Other Specialized Uses
Retaining walls
Protective structures in high-impact areas
Components requiring high toughness and low-temperature performance
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. Stacked Bundle Packaging
Steel plates are sorted and stacked neatly according to different sizes and specifications. Wooden or steel spacers are inserted between each layer to keep the plates flat, avoid direct contact and prevent surface friction damage. All stacked bundles are tightly fastened with steel straps to ensure overall stability during transit and avoid shifting or loosening.
2. Crate & Pallet Packaging
Small-sized and high-grade steel plates adopt wooden crate or pallet packaging solutions. Rust-proof paper and plastic film are lined inside the packages for moisture and corrosion protection. This standard export packaging method simplifies loading, unloading and warehouse handling, and fully adapts to international transportation and long-term overseas storage.
3. Bulk Shipment Packaging
Oversized and large-size steel plates are delivered in bulk by sea or land transport. Wooden cushion blocks and professional protective materials are applied at the contact positions of the plates. This effectively buffers extrusion and collision during transportation, protecting the steel plate surface and overall structural integrity.
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?
ASTM A709 is a high-strength structural steel plate commonly used in the construction of bridges and heavy infrastructure. It offers good strength, toughness, and weather resistance, making it suitable for outdoor and harsh environments.
2. Can ASTM A709 steel plate be welded?
Yes. It can be welded using conventional methods. For thicker plates or welding at low temperatures, preheating and post-weld heat treatment may be required. Weather-grade plates require more stringent welding controls.
3. What sizes and thicknesses are available?
Thickness: 6–250 mm; Width: Maximum 4000 mm; Length: Maximum 12000 mm, or other sizes can be cut to order.
4. What is the difference between ASTM A709 vs ASTM A36?
Due to its higher strength and better toughness, ASTM A709 is considered a more suitable choice for bridges and heavy structures. ASTM A36 is suitable for structural and general applications.
5. How is testing conducted?
Tensile strength testing, impact (low temperature) testing, chemical composition analysis, dimensional and surface inspection.
6. Why choose ASTM A709?
“Because it is designed for high-performance applications in bridges and demanding infrastructure. ASTM A709 offers superior strength, good weldability, and high quality, and its excellent overall performance makes it suitable for general bridges, advanced bridges, and heavy-duty structures,” Bagwell stated. Its combination of high strength, durability, and proven performance makes it ideal for bridge and long-life structural applications, especially in harsh environments.
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