Equal Angle Steel 40*40*5 Mild Steel A36 Angle Steel

The equal angle steel featured here is a precision-engineered structural component defined by its 40mm×40mm×5mm dimensions-indicating two identical legs of 40mm in length and a uniform thickness of 5mm across the L-shaped cross-section. Classified as mild steel (low-carbon steel) and conforming to the A36 grade (an ASTM International standard), this product balances mechanical performance, processability, and cost-effectiveness, making it a staple in industrial and construction applications requiring reliable load support and structural stability.

Material Properties of A36 Mild Steel

As an A36-grade mild steel product, it exhibits key material characteristics that underpin its usability:

Mechanical Strength: Boasts a minimum yield strength of 36 ksi (250 MPa) and a tensile strength range of 58–80 ksi (400–550 MPa), enabling it to withstand static and moderate dynamic loads without permanent deformation.

Low-Carbon Composition: With a carbon content typically ranging from 0.25% to 0.29%, it offers excellent weldability-compatible with common welding methods (MIG, TIG, arc welding) without requiring pre-heat or post-heat treatments, simplifying on-site assembly.

Ductility & Toughness: Features an elongation rate of at least 20% in 203mm (8-inch) specimens, allowing for bending, forming, and fabrication into custom shapes (e.g., curved supports, reinforced brackets) without cracking. It also maintains impact resistance at temperatures as low as -18°C (0°F), suitable for outdoor or cold-environment projects.

Corrosion Resistance: While mild steel is not inherently rust-proof, the A36 base material accepts protective finishes (hot-dip galvanizing, painting, powder coating) effectively, extending service life in humid, coastal, or industrial environments.

Structural Advantages of 40405 Equal Angle Design

The 40mm×40mm×5mm equal-angle profile delivers targeted structural benefits for specific load requirements:

Symmetrical Load Distribution: The identical leg length ensures uniform stress transfer across both sides of the L-shape, preventing localized stress concentrations when used as supports, frames, or bracing. This symmetry is critical for applications like wall studs or truss components, where balanced load-bearing is essential.

Optimal Thickness-to-Size Ratio: The 5mm thickness provides sufficient rigidity for the 40mm leg length, avoiding excessive weight while maintaining structural integrity. This makes the product lightweight enough for easy handling and transportation, yet robust enough to replace thicker, heavier sections in low-to-medium load scenarios.

Versatile Integration: The compact 40mm leg size is ideal for applications with space constraints (e.g., narrow machine frames, small-scale storage racks) while still offering enough surface area for fastening (drilling, bolting) to other structural elements (beams, plates, concrete anchors).

Typical Applications

Given its dimensions, material grade, and properties, this 40405 A36 mild steel equal angle steel is commonly used in:

Light to Medium Construction: Interior wall framing, ceiling joists, and residential/commercial truss components; small-scale building extensions or renovation projects.

Industrial Manufacturing: Machinery bases, equipment frames (for small to mid-sized machines), conveyor system supports, and storage rack uprights or cross-braces.

Infrastructure & Utility: Signage poles, guardrail posts, electrical conduit supports, and lightweight bridge deck bracing (for pedestrian or small vehicle bridges).

Custom Fabrication: Handrails, safety barriers, display stands, and architectural details (e.g., decorative metalwork in commercial spaces), where formability and aesthetic finish are priorities.

Quality Compliance & Certification

This product adheres to strict quality standards to ensure consistency and reliability:

ASTM A36 Compliance: Manufactured in accordance with ASTM A36/A36M, the global benchmark for carbon structural steel, ensuring compliance with international material and performance requirements.

Dimensional Precision: Meets ASTM dimensional tolerances for angle steel (ASTM A6/A6M), with leg length variations within ±1.5mm and thickness deviations within ±0.3mm, guaranteeing compatibility with standard fasteners and seamless assembly.

Quality Documentation: Each batch is accompanied by a Material Test Certificate (MTC) verifying chemical composition, mechanical properties (yield strength, tensile strength, elongation), and manufacturing process-enabling traceability and regulatory compliance for critical projects.

Surface Quality: The hot-rolled surface (standard finish) is free from cracks, laminations, or excessive scale, providing a clean base for subsequent finishing or direct use in indoor, low-corrosion environments.