High-Strength Wide Flange Beam for Structural Applications
The W6×9 ASTM A572 Grade 50 H Beam is a high-strength wide flange structural steel section engineered for load-critical and durability-demanding applications.
Manufactured in accordance with ASTM A572 / A572M, this beam delivers a minimum yield strength of 50,000 psi (345 MPa), enabling superior load resistance while maintaining excellent weldability and fabrication performance.
The "W" (Wide Flange) designation indicates parallel flange surfaces and a wide flange geometry, which provides improved load distribution, higher bending efficiency, and enhanced structural stability compared with traditional I-beams.
This makes the W6×9 A572GR50 beam especially suitable for modern structural designs where strength optimization and weight efficiency are essential.
Key Features & Advantages
High Strength-to-Weight Ratio
A minimum yield strength of 50 ksi allows lighter structural sections while maintaining load-bearing capacity, reducing overall steel consumption.
Wide Flange Geometry
Improves moment resistance and load transfer, enhancing performance in beams, columns, and framing systems.
Excellent Weldability
Low carbon content and controlled alloying elements ensure good weldability using standard welding procedures.
Durable and Reliable Performance
Suitable for long-term service in demanding environments, including heavy loads and dynamic stresses.
Cost-Efficient Structural Solution
Optimized section design helps lower fabrication, transportation, and installation costs.
Products Description
General Information
| Parameter | Details |
|---|---|
| Steel Grade | ASTM A572 Grade 50 |
| Section Type | W (Wide Flange) |
| Standard | ASTM A572 / A572M |
| Tolerance | Conforms to ASTM dimensional and weight tolerances |
| Surface Finish | Mill Finish, Shot Blasted, or Custom Finish |
| Supply Length | Standard lengths or cut-to-length upon request |
Section Dimensions – W6×9
| Dimension | Value |
|---|---|
| Nominal Depth | 6 inches |
| Flange Width | 6 inches |
| Web Thickness | 0.23 inches |
| Flange Thickness | 0.41 inches |
| Weight | 9 lbs per foot |
Chemical Composition (Typical, %)
| Element | Content |
|---|---|
| Carbon (C) | 0.23 – 0.28 |
| Manganese (Mn) | 1.35 – 1.65 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Silicon (Si) | 0.15 – 0.40 |
| Copper (Cu) | 0.20 – 0.35 |
| Vanadium (V) | 0.02 – 0.08 |
| Nickel (Ni) | 0.40 – 0.70 |
| Chromium (Cr) | ≤ 0.20 |
Note: Chemical composition may vary slightly depending on mill practice while remaining compliant with ASTM A572 requirements.
Typical Applications
Bridge Construction
The high yield and tensile strength of the W6×9 A572GR50 H beam make it well-suited for bridge beams, girders, and structural supports, where load-bearing capacity and fatigue resistance are critical.
Building Frameworks
Widely used in commercial, industrial, and multi-story buildings, this beam provides reliable structural integrity for columns, floor beams, and framing systems.
Heavy Machinery & Industrial Facilities
Its strength and dimensional stability make it ideal for machinery supports, crane frameworks, platforms, and warehouse structures subjected to heavy static and dynamic loads.
Why Choose W6×9 A572 Grade 50 H Beams?
Compared with conventional carbon steel beams (such as ASTM A36), A572 Grade 50 W-beams allow engineers to achieve higher strength with less material, resulting in more efficient structural designs and long-term cost savings.
The W6×9 section is particularly suitable for projects requiring compact size, moderate weight, and high structural reliability.
Q What makes A572 steel high strength and weldable?
A A572 is a high-strength, low-alloy (HSLA) steel that achieves enhanced yield strength through controlled addition of manganese, vanadium, and sometimes niobium. Its fine-grain microstructure ensures both toughness and excellent weldability, making it suitable for structural applications that require on-site welding without extensive preheating.
Q How does welding affect A572 steel?
A Although A572 has a low carbon equivalent, excessive heat input during welding can lead to localized softening in the heat-affected zone (HAZ) or distortion in thick plates. Using low-hydrogen electrodes and controlling interpass temperature ensures that the welded joint maintains the specified mechanical properties.
Q What are the impact toughness limitations of different A572 grades?
A Impact toughness decreases as the steel's yield strength increases. For instance, Grade 50 provides sufficient toughness for building frames, whereas Grade 70 is better suited for heavy industrial structures or bridges, especially in cold environments, where low-temperature fracture resistance is critical.
Q How does A572 compare with conventional mild steels like A36?
A Compared with A36, A572 offers significantly higher yield strength (50–70 ksi vs 36 ksi) and improved toughness. This allows structural members to be thinner and lighter, reducing material costs and overall weight while maintaining structural performance. However, higher-strength plates require stricter welding and fabrication control.
Q Where is A572 typically used?
A A572 is widely applied in bridges, high-rise buildings, stadiums, and heavy industrial structures. Its combination of strength, weldability, and toughness makes it a versatile choice for projects requiring high-performance steel with reliable structural integrity.
Q What fabrication considerations should engineers keep in mind?
A Even though A572 is easier to weld than quenched-and-tempered steels, engineers must consider preheating for thick plates, carefully plan welding sequences to reduce residual stresses, and perform inspection on critical welds and HAZ to ensure compliance with mechanical specifications.