ASTM A709 Grade 50W Steel Plates
ASTM A709 Grade 50W Steel Plates are a high-performance steel grade widely used in the construction of bridges and other structural applications. These plates are specifically designed for improved durability, enhanced resistance to corrosion, and excellent weldability. Manufactured under the ASTM A709 specification, these steel plates are known for their exceptional strength and adaptability, making them a preferred choice in challenging environments.
What is ASTM A709 Grade 50W?
ASTM A709 Grade 50W, also referred to as ASTM A709 50W, is a weathering steel grade with a unique composition that allows it to form a protective rust layer over time. This layer prevents further corrosion, eliminating the need for paint or additional coatings in most applications. The grade combines strength, toughness, and atmospheric corrosion resistance, making it suitable for exposed applications like bridge construction and other outdoor structures.

ASTM A709 Grade 50W Steel Properties
ASTM A709 Grade 50W Steel Plates exhibit the following properties:
- High Strength: The steel has a minimum yield strength of 345 MPa (50 ksi) and a tensile strength ranging from 485 to 630 MPa (70 to 90 ksi).
- Weathering Resistance: The steel’s alloying elements, such as copper, chromium, and nickel, provide superior resistance to atmospheric corrosion.
- Toughness: The material demonstrates excellent impact resistance, even in low-temperature conditions.
- Weldability: ASTM A709 50W steel is readily weldable using conventional welding techniques.
- Durability: The steel’s resistance to fatigue and environmental damage ensures long service life.
Advantages of ASTM A709 Grade 50W Steel Plates
- Cost-Effectiveness: Reduced maintenance costs due to its weathering capabilities.
- Environmental Sustainability: No need for paints or coatings that may contain harmful chemicals.
- Aesthetic Appeal: Develops a natural patina over time, offering a rustic and modern look.
- Durability: Long service life, even in harsh environments.
- High Strength: Withstands heavy loads and harsh conditions.
Applications of ASTM A709 Grade 50W Steel Plates
The versatility of ASTM A709 Grade 50W Corten Steel Plates makes it a sought-after material for several applications, including:
- Bridge Construction: Widely used for constructing bridges due to its high strength, durability, and weathering resistance.
- Highway Structures: Ideal for guardrails, signposts, and other highway infrastructure exposed to the elements.
- Buildings: Used in the construction of modern architectural designs requiring exposed steel elements.
- Railway Applications:Suitable for railway cars and components due to its superior wear resistance.
- Industrial Equipment: Applicable in the fabrication of industrial equipment that operates in harsh environments.


ASTM A709 Schedule and Size Chart
Plate Thickness (mm) | Width (mm) | Length (mm) |
6 – 25 | Up to 3500 | Up to 12000 |
25.1 – 50 | Up to 3000 | Up to 15000 |
50.1 – 100 | Up to 2500 | Up to 18000 |
100.1 – 300 | Up to 2000 | Custom lengths |
ASTM A709 Plates Mechanical Properties
Property | Value |
Yield Strength | 345 MPa (50 ksi) min |
Tensile Strength | 485-630 MPa (70-90 ksi) |
Elongation (% in 50 mm) | 18% min |
Impact Energy | 15 J at -40°C |
ASTM A709 Grade 50 Steel Plate Specification
Property | Specification |
Standard | ASTM A709/A709M |
Grade | 50W |
Heat Treatment | Normalized or TMCP |
Thickness Range | 6 mm to 300 mm |
Width Range | Up to 3500 mm |
Length Range | Up to 18000 mm |
Surface Finish | Mill finish, shot-blasted |
Grade 50W Physical Properties Chart
Property | Value |
Density | 7.85 g/cm³ |
Modulus of Elasticity | 200 GPa |
Thermal Conductivity | 40.2 W/m-K (at 20°C) |
Specific Heat | 486 J/kg-K (at 20°C) |
Electrical Resistivity | 0.6 µΩ-m |
ASTM A709 Chemical Composition
Element | Composition (%) |
Carbon (C) | 0.19 max |
Manganese (Mn) | 0.80-1.25 |
Phosphorus (P) | 0.04 max |
Sulfur (S) | 0.05 max |
Silicon (Si) | 0.40 max |
Copper (Cu) | 0.25-0.40 |
Chromium (Cr) | 0.40-0.65 |
Nickel (Ni) | 0.40 max |
Heat Treatment Chart
Heat Treatment Method | Description |
Normalizing | Heating to austenitizing temperature and air cooling |
TMCP | Combination of controlled rolling and cooling processes |
Stress Relieving | Heating to 540-600°C and holding, followed by cooling |
ASTM A709 Grade 50W Weathering Steel
ASTM A709 Grade 50W is classified as weathering steel or corten steel due to its ability to naturally resist corrosion. This property reduces maintenance costs and enhances the aesthetic appeal of structures over time. The material’s protective patina, which develops when exposed to the atmosphere, acts as a barrier against moisture and oxygen.
This self-healing property makes ASTM A709 Grade 50W an eco-friendly alternative to traditional steel grades that require protective coatings or frequent maintenance. It is widely utilized in environments where exposure to moisture and pollutants is unavoidable, such as coastal and industrial areas.
Why Choose ASTM A709 Grade 50W from ASC LLP?
At ASC LLP, we pride ourselves on being a leading supplier and manufacturer of ASTM A709 Grade 50W Steel Plates. Our products meet the highest quality standards and are available in various dimensions and specifications to cater to diverse industrial needs. Here’s why you should choose us:
- Quality Assurance: All our products undergo rigorous quality checks to ensure compliance with ASTM standards.
- Customization Options: We offer plates in various sizes, finishes, and heat treatments to meet specific requirements.
- Global Supply Network: With a robust supply chain, we deliver products to clients worldwide, ensuring timely deliveries.
- Competitive Pricing: Our pricing strategy ensures value for money without compromising quality.
ASTM A709 Grade 50W Steel Plates are an excellent choice for construction and structural applications, thanks to their exceptional strength, durability, and weathering resistance. At ASC LLP, we provide high-quality ASTM A709 Grade 50W plates tailored to meet your specific needs. Contact us today to learn more about our products or to request a quote.
Global Reach
Amardeep Steel Centre boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality ASTM A709 Grade 50W Steel Plates. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.

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