Learn About the Latest ASTM A709 Steel Plate/Sheet Price, Specifications and Dimensions.
ASTM A709 Grade 50 Steel Plate | High-Strength Bridge Structural Steel
ASTM A709 Grade 50 is a high‑strength structural steel plate widely adopted for bridge building and other heavy‑duty infrastructure works. Produced to the ASTM A709/A709M specification, this grade balances solid strength, dependable structural performance and good workability, making it ideal for projects requiring robust load‑bearing capability and long‑service‑life performance.
It delivers a minimum yield strength of 345 MPa, with typical tensile strength falling between 450 MPa and 620 MPa. These mechanical properties make A709 Grade 50 well‑suited for highway bridges, viaducts, flyovers and other structures subject to heavy traffic loads.
Royal Steel Group offers A709 Grade 50 steel plates across multiple thickness, width and length options. Custom cut‑to‑size dimensions can also be provided to match individual project specifications.
| Steel Grade | ASTM A709 Grade 50 |
| Applicable Standard | ASTM A709 / A709M |
| Minimum Yield Strength | ≥345 MPa |
| Tensile Strength | 450–620 MPa |
| Standard Thickness | 3/8"–1" (9.53–25.40 mm) |
| Standard Width | 48"–120" (1220–3048 mm) |
| Standard Length | 96"–480" (2438–12192 mm) |
| Maximum Length | Up to 1020" (25,910 mm) |
| Product Type | Hot Rolled Structural Steel Plate |
| Main Applications | Bridges, Viaducts, Highway Structures, Heavy-Traffic Infrastructure |
Note: Actual dimensions, tolerances, mechanical properties and available grades should be confirmed against the applicable ASTM specification and the purchase order. Custom sizes can be discussed according to project requirements.
1. Superior Structural Strength
Boasting a minimum yield strength of 345 MPa, A709 Grade 50 performs reliably for structural parts exposed to heavy static and dynamic loading conditions.
2. Purpose‑Built for Bridge Projects
ASTM A709 sets out structural steel specifications tailored to bridge and associated infrastructure builds. Grade 50 is a frequent choice for load‑carrying bridge members, where consistent strength and structural soundness are non‑negotiable.
3. Ideal for Heavy‑Use Infrastructure
Thanks to its balanced mechanical properties, A709 Gr50 fits well for highway bridges, viaducts, flyovers and other constructions that endure constant heavy traffic.
4. Broad Size Availability
We stock A709 Grade 50 plates across a wide range of thickness, width and length options. Large‑format plates help cut down joint counts and ease on‑site fabrication for properly engineered structures.
5. Customized Supply Solutions
Royal Steel Group supports custom sizing, cutting and processing services. We can align deliveries strictly with project drawings and client purchasing requirements.
The primary mechanical properties specified for this product include:
| Property | A709 Grade 50 |
| Minimum Yield Strength | ≥345 MPa |
| Tensile Strength | 450–620 MPa |
| Steel Type | High-Strength Structural Steel |
For bridge projects, engineers should verify the complete mechanical-property requirements, chemical composition, impact requirements and supplementary requirements against the applicable ASTM A709/A709M edition and project specifications.
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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When sourcing steel for bridge and infrastructure builds, buyers typically evaluate material strength, standard compliance, available sizes, processing needs and dependable delivery performance.
A709 Grade 50 delivers the following key attributes:
Minimum yield strength of 345 MPa
Tensile strength ranging from 450 MPa to 620 MPa
Manufactured in line with ASTM A709/A709M standard
Proven performance for bridge and civil infrastructure applications
Broad selection of plate thickness and width
Long‑length plate supply available
Custom cutting and size adjustments to fit project needs
Full inspection support and complete material test documentation
Royal Steel Group executes a well‑managed production workflow for steel plate manufacturing:
Raw material input → Steel melting → Continuous casting → Reheating → Hot rolling → Controlled cooling → Cutting → Surface quality check → Dimensional verification → Mechanical property testing → Final quality audit → Packing → Dispatch
Every production step is closely monitored, so our steel plates consistently meet agreed technical specifications.
If your project calls for third‑party inspection services, we can coordinate relevant arrangements prior to production kick‑off.
A709 Grade 50 plates can be supplied with processing options based on fabrication requirements, including:
Standard hot-rolled surface
Cut-to-length plates
Flame cutting
CNC cutting
Edge preparation
Customized plate dimensions
Additional surface treatment when specified
For structural fabrication, cutting and edge requirements should be provided with the purchase order or engineering drawings.
Highway Bridges
A709 Grade 50 works well for structural members within highway bridge builds, especially for components that must withstand heavy load‑bearing demands.
Viaducts and Overpasses
This steel grade fits structural systems for urban viaducts, elevated road networks and grade‑separated overpass projects.
Heavy‑Traffic Infrastructure
Thanks to its robust high‑strength properties, it is a practical choice for infrastructure constantly subjected to heavy traffic loads.
Bridge Fabrication Works
A709 Grade 50 steel plates can be cut and manufactured into finished structural assemblies, following project engineering drawings and fabrication specifications.
General Transportation Infrastructure
It is also a viable option for large‑scale transportation infrastructure projects calling for ASTM‑certified structural steel materials.
Royal Steel Group supplies structural steel products for construction, infrastructure, bridge and industrial projects. A709 Grade 50 steel plate can be supplied according to agreed ASTM requirements, dimensions and inspection specifications.
Our service can support:
Material Selection → Technical Confirmation → Quotation → Production → Inspection → Documentation → Shipping
For large bridge projects, please provide the required plate thickness, width, length, quantity, delivery destination and applicable specification so that the supply solution can be confirmed accurately.
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
Quality control is a core priority for steel materials used in bridges and civil infrastructure, as these steels serve as permanent load-bearing components that sustain long-term structural safety and stability.
We conduct a full range of quality inspections tailored to diverse project demands, covering the following key testing and verification items:
Chemical composition analysis
Tensile property testing
Yield strength detection
Elongation performance testing
Thickness and overall dimensional verification
Surface condition quality inspection
Custom ultrasonic testing as required by project standards
Authorized third-party inspection services
Official Mill Test Certificate (MTC) provision
All inspection scopes and testing standards are strictly finalized in accordance with relevant ASTM specifications and the purchaser’s technical requirements to ensure full compliance with project standards.
Royal Steel Group applies export‑grade packing solutions to safeguard steel plates throughout handling and cross‑ocean transit.
Standard Packing
Plates bundled or stacked by dimension
Fastened with heavy‑duty steel strapping
Waterproof barrier coverage
Edge guards applied where necessary
Markings complying with export norms
Custom packing options for container or bulk cargo
Transport Options
We support multiple shipping modes:
Container loading
Breakbulk shipment
Bulk carrier
Truck delivery
Combined multimodal transport
Packing and loading plans can be adjusted based on plate sizes, total tonnage, destination port and chosen shipping solution.
1. What is ASTM A709 Grade 50 steel?
ASTM A709 Grade 50 is a high‑strength structural steel defined by the ASTM A709/A709M standard. It finds its main use in bridge construction and various civil infrastructure projects.
2. What yield strength does A709 Grade 50 offer?
A709 Grade 50 features a minimum yield strength of 345 MPa.
3. What is the tensile strength for A709 Grade 50?
Its tensile strength falls within the 450‑620 MPa range.
4. Can A709 Grade 50 be used for bridge projects?
Absolutely. The ASTM A709 standard was developed specifically for bridge‑grade structural steel, and Grade 50 is a widely preferred option for high‑load bridge components.
5. What are the common uses for A709 Grade 50?
It is regularly specified for highway bridges, viaducts, elevated overpasses and other infrastructure exposed to heavy traffic loads.
6. Are custom sizes available for A709 Grade 50 steel plates?
Yes. We accommodate custom dimensions, cutting and additional processing based on project drawings and purchasing requirements.
7. Which documents come with A709 Grade 50 shipments?
Paperwork varies per order and may include Mill Test Certificates (MTC), packing list, commercial invoice, certificate of origin and third‑party inspection reports where applicable.
8. How can I get a quotation for A709 Grade 50 steel plates?
Please share your required thickness × width × length, total quantity, destination port, applicable ASTM requirements and inspection needs. We will then verify stock or production feasibility and outline suitable shipping solutions for your quote.
ROYAL STEEL GROUP
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Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
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