ASTM A 709 Gr.50W Weather-resistant steel sheet

ASTM A709 Grade 50W is a high-strength, low-alloy structural steel specifically designed for bridges and structures exposed to the elements, with enhanced atmospheric corrosion resistance.

Weather-Resistant: Contains additional alloying elements (like Cu, Cr, Ni) that form a protective rust-like patina when exposed to air and moisture. This patina prevents further corrosion, reducing the need for painting or coatings.

High Strength: Minimum yield strength of 50 ksi (345 MPa) and tensile strength of 65 ksi (450 MPa), suitable for structural applications.

Durability: Designed to withstand dynamic loads, extreme weather, and temperature variations in bridges and civil infrastructure.

Low Maintenance: The natural weathering process forms a protective layer, minimizing long-term maintenance.

Bridges (highways, railways, pedestrian)

Structural components exposed to outdoor environments

Marine and industrial structures

Retaining walls and large-scale civil engineering projects

Carbon (C): ≤ 0.23%

Manganese (Mn): 1.35% max

Copper (Cu): ≥ 0.20%

Sulfur (S) & Phosphorus (P): ≤ 0.03%

Enhanced corrosion resistance compared to plain A709 Grade 50.

Forms a stable protective patina that improves aesthetics and longevity.

Ideal for long-term outdoor exposure without the need for surface coatings.

ASTM: A709 Grade 50W

EU Equivalent: S355J2W

Japan: SMA50CP

Germany: WTSt52-3

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What is A709 grade 50W steel?

ASTM A709-50W is a standard specification for structural steel primarily in the fabrication of steel bridges. ASTM A709-50W covers high strength, low allow steel structural shapes, plates and bars.

What is ASTM A709 steel grade?

The ASTM A709 is the Standard Specification for Structural Steel for Bridges and encompasses carbon, high-strength low-alloy, and quenched and tempered alloy steels used as structural plates in the construction of bridges. SSAB offers the following five grades of A709; 36, 50, 50W, HPS 50W and HPS 70W.

What is the difference between ASTM A572 Grade 50 and ASTM A709 Grade 50?

A572 Grade 50: Used in a wide range of structural applications, including buildings, transmission towers, equipment, and general construction. It's not specifically optimized for bridges. A709 Grade 50: Primarily used for bridge construction and other structures where enhanced toughness and weldability are critical.

What is the yield strength of ASTM A709 grade 50?

Grade 50 steel of this specification requires a minimum yield strength of 50 ksi. Used as structural members in bridge building or for similar structures.

What is the difference between ASTM A36 and A709?

ASTM A709 grade 36 is a bridge material wherein carbon adds to the strength and hardenability of the steel. A36 has less than0. 30% carbon and thus, do not possess high hardenability. ASTM A709 grade 36 steel plate has improved corrosion resistance and can be used in outdoor applications.

What is ASTM A572 grade 50 equivalent to?

ASTM A572 Grade 50 is equivalent to several other steel grades, with the most common international equivalents being S355JR (European standard) and Q345B (Chinese standard). The best equivalent depends on the specific project requirements, so it is always best to consult material specifications and a specialist to confirm compatibility.

What is the difference between ASTM A36 and ASTM A572 GR 50?

As mentioned earlier, A36 is steel that has a minimum yield strength of 36,000 PSI. This grade derives its strength from a combination of carbon and manganese. On the other hand, A572-50, for example, is a type of steel with a minimum yield strength of 50,000 PSI.

What is the difference between A572 and s355?

In summary, both ASTM A572 Grade 50 and S355JR are excellent choices for structural steel applications, with ASTM A572 Grade 50 providing higher strength capabilities and S355JR offering versatility and widespread use in European construction projects.

Is A572 steel corrosion resistant?

A572 steel is typically used in structural applications due to its high strength, ductility, weldability and corrosion resistance. These applications include structural sections, reinforcing bars, bridges, skyscrapers and houses.