Steel Angle Specifications, Grades & Applications in Structural Engineering

        In the field of steel structure and foundation engineering, steel angles are one of the most basic,common, and critical materials.Whether it's for factory building frames, bridge trusses, warehouse shelving, or mechanical structure support systems, steel angles, with their structural stability and ease of fabrication, serve as important supporting and reinforcing components. Understanding the specifications, properties, and application scenarios of steel angles is crucial not only for engineering designers but also essential basic knowledge for procurement and project planning personnel.

        Ⅰ. What is angle steel and what is its basic structure?

        Angle steel, also known as angle iron, angle bar, or angle rod, is an L-shaped structural steel made from hot-rolled carbon steel or high-strength low-alloy steel. This L-shaped structure consists of two mutually perpendicular "legs," with a standard angle of 90 degrees.Based on whether the two legs are equal in length, it can be classified as follows:

        • Equal angles: Both sides have the same length.

        • Unequal angles: The two sides have different lengths.

        Angle steel specifications are typically expressed as side length × side length × thickness (e.g.,50×50×5 mm), representing the specific dimensions of the side width and thickness.

        Ⅱ. Main specifications and material grades of angle steel

        In Metal's product range, angle steel specifications are extensive and can be further customized according to project needs, including different lengths, thicknesses, and processing methods.This ensures that the products meet the requirements of different engineering structures and load-bearing capacities.

        • Equal-leg angle steel specifications: such as 20×20×3 mm to 75×75×9 mm.

        • Unequal-leg angle steel specifications: such as 75×50×5 mm to 200×100×12 mm.

        • Material Grade: Commonly used Q235 carbon structural steel; higher strength grades or surface-treated versions are also available upon request.

        Ⅲ. Physical and mechanical properties of angle steel

        The L-shaped cross-section design of angle steel provides high strength and excellent load-bearing capacity,making it particularly suitable for structural load bearing components. Its main performance characteristics include:

        • High strength and lightweight: It performs robustly under multi-directional loads such as compression, tension, and bending.

        • Good bending and torsional resistance: The L-shaped cross-section effectively distributes stress, improving the overall stability of the component.

        • Excellent processability and connectivity: It can be easily welded, cut, and drilled,and combined with other steel sections and plates for use in structural systems.

        Ⅳ. Typical applications of angle steel in engineering structures.

        1. Building Structures and Support Frames: Angle steel is commonly used to construct the main frames, support beams, and truss structures of industrial plants, warehouses, and other buildings, providing a sturdy skeletal support for the structures.

        2. Infrastructure and Bridge: In infrastructure projects such as bridges, power transmission towers,and communication tower,angle steel can serve as a load-bearing component, connecting structure, or auxiliary support, withstanding concentrated and dynamic loads.

        3. Machinery and Factory Equipment: Angle steel is commonly used in various heavy machinery, industrial support frames, reaction towers, or equipment frames, where it serves a load-bearing and positioning function.

        4. Everyday facilities and lightweight structures: In lightweight structures such as those used in gardens, furniture, shelving, display stands, and aircraft supports, angle steel is often used as a connecting material or a local support element.

        Conclusion

        As one of the most basic and widely used structural steel components, angle steel plays an irreplaceable role in various engineering projects due to its reliable mechanical properties and high adaptability.

        Metal Company, backed by extensive manufacturing experience, provides customized services to meet clients' engineering needs, helping them achieve high quality and long-lasting engineering structures. For angle steel specifications, pricing, or engineering technical support, please feel free to contact us.