Learn About the Latest ASTM A709 Steel Plate/Sheet Price, Specifications and Dimensions.
ASTM A709 High-Performance Structural Steel Plate | Grade 36 / 50 / 50W / HPS 70W / HPS 100W
| 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 Bundles
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Steel plates are stacked neatly by size.
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Wooden or steel spacers are placed between layers.
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Bundles are secured with steel straps.
2. Crate or Pallet Packaging
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Small-size or high-grade plates can be packed in wooden crates or on pallets.
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Moisture-proof materials like rust-preventive paper or plastic film can be added inside.
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Suitable for export and easy handling.
3. Bulk Shipping
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Large plates may be transported by ship or truck in bulk.
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Wooden pads and protective materials are used to prevent collision.
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. This guarantees the H-beams from the factory all the way to the project site, helping you build on a solid foundation for a trouble free project!
1. What is ASTM A709 steel plate?
ASTM A709 is a high-strength, low-alloy structural steel plate primarily used in bridges, heavy construction, and infrastructure projects. It offers excellent toughness, weldability, and durability in outdoor and high-stress environments.
2. Can ASTM A709 steel be welded?
Yes. All grades are weldable, but proper preheating and post-weld treatment may be required for thick plates or low-temperature environments. Weathering grades require careful welding to maintain corrosion resistance.
3. What sizes and thicknesses are available?
Plate thickness: Usually 6 mm – 250 mm
Width: Up to 4,000 mm depending on manufacturer
Length: Typically 12,000 mm, but can be customized
4. What is the difference between ASTM A709 and ASTM A36?
ASTM A709 has higher strength, better toughness, and optional weathering properties.
ASTM A36 is a standard carbon steel, mainly for general structural applications, not optimized for bridges or harsh environments.
5. How is ASTM A709 steel plate tested?
Tensile tests to verify yield and ultimate strength
Charpy impact tests for toughness at low temperatures
Chemical analysis to confirm alloy composition
Flatness and dimensional checks
6. Why choose ASTM A709 steel plate?
High-strength for reduced weight
Excellent weldability and fabrication performance
Optional weathering grades for long-term durability
Suitable for both low-temperature and high-stress environments
Contact Details
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Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
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