2024 T3 T351 Aerospace High Strength Aluminum Alloy Sheet Plate 0.5mm-200mm for Aircraft Structural Components

This 2024 aluminum alloy sheet in T3 and T351 tempers represents the premier high-strength aerospace aluminum product, engineered for critical structural applications where maximum strength-to-weight ratio and fatigue resistance are paramount. The 2024 alloy belongs to the aluminum-copper-magnesium system (2xxx series), with a nominal composition of 4.4% copper, 1.5% magnesium, and 0.6% manganese. This carefully balanced chemistry enables precipitation hardening through solution heat treatment followed by natural aging, developing tensile strengths exceeding 400 MPa in thin gauges while maintaining approximately one-third the density of steel. The T3 temper designation indicates solution heat treatment, cold working, and natural aging to a substantially stable condition, providing an optimal combination of strength, ductility, and fracture toughness. The T351 temper variant adds stress-relief by controlled stretching after solution heat treatment, reducing residual stresses in plate products and improving dimensional stability during subsequent machining operations. Each production lot is fully traceable to the original cast ingot and accompanied by a comprehensive mill test certificate documenting chemical composition, tensile properties, hardness, electrical conductivity, and ultrasonic inspection results where applicable.

For applications requiring enhanced corrosion protection without compromising structural performance, we offer Alclad 2024 sheet products. Alclad 2024 consists of a 2024 core alloy metallurgically bonded on one or both sides with a thin layer of high-purity aluminum (typically 1050 or 1230 alloy), providing galvanic protection to the corrosion-susceptible 2024 core. The cladding layer, comprising 1.5% to 5% of the total sheet thickness per side, sacrificially corrodes to protect the core alloy while contributing minimal strength loss. Alclad products are the industry standard for aircraft fuselage skin panels and other external airframe structures exposed to atmospheric corrosion during service. Bare (unclad) 2024 sheet and plate is specified for internal structural components, machined fittings, and applications where the part will receive a complete protective coating system such as chromic acid anodizing with epoxy primer. All Alclad products are identified with distinctive cladding thickness markings and are supplied with a protective interleaving material to prevent surface damage during handling and transport.

• Exceptional Strength-to-Weight Ratio: Yield strength of 290-345 MPa in T3/T351 temper at only 2.78 g/cm³ density, providing structural efficiency unattainable with steel or titanium alternatives.
• Precipitation Hardened Microstructure: Solution heat treated at 493±6°C followed by controlled quenching and natural aging to develop fine S-phase (Al2CuMg) precipitates that maximize strength while maintaining adequate ductility.
• Alclad Corrosion Protection: Metallurgically bonded 1050 or 1230 pure aluminum cladding provides cathodic protection to the 2024 core, dramatically improving resistance to exfoliation, intergranular, and pitting corrosion in atmospheric service.
• T351 Stress-Relieved Option: Controlled stretching after solution treatment eliminates quench-induced residual stresses, ensuring dimensional stability during high-precision CNC machining of complex structural components.
• Aerospace Certification: Manufactured and tested in accordance with AMS-QQ-A-250/4, AMS 4037, and ASTM B209 standards, with full chemical and mechanical traceability documentation for every production lot.
• Ultrasonic Inspection Available: Plate products in thicknesses ≥6mm undergo ultrasonic immersion testing per AMS-STD-2154 Class A or B, detecting internal discontinuities as small as 1.2mm flat-bottom hole equivalent.
• Fatigue and Fracture Performance: Excellent fatigue crack growth resistance and fracture toughness (KIC typically 25-35 MPa√m in T351 plate) make 2024 the alloy of choice for tension-dominated airframe structures subject to cyclic loading.

2024 aluminum alloy is the historical backbone material of aerospace construction, selected for the majority of tension-dominated structural applications in both commercial and aircraft since its introduction in the 1930s. Primary airframe applications include fuselage skin panels on Boeing 737 and Airbus A320 family aircraft, where Alclad 2024-T3 sheet provides the optimal combination of fatigue resistance, damage tolerance, and atmospheric corrosion protection for pressurized fuselage structures. Wing lower skin panels and wing tension members utilize 2024-T351 plate for its superior tensile strength and fatigue crack growth resistance under the repeated tensile loading cycles experienced during takeoff, cruise, and landing operations. Aircraft internal structural components fabricated from bare 2024 plate include fuselage frames, wing ribs, spar webs, floor beams, and bulkhead fittings, where the high strength permits thinner sections and weight savings that directly translate to increased payload or fuel efficiency. applications extend to armored personnel carrier hull plates, missile airframe components, artillery shell bodies, and naval vessel superstructure panels where ballistic protection and structural integrity must be achieved at minimum weight. In the motorsport industry, 2024-T351 plate is machined into Formula One suspension uprights, gearbox casings, and brake caliper components where every gram of weight reduction contributes to lap time improvement. Industrial applications include high-speed machine components, robotic arm segments, optical bench structures, and precision tooling plates for plastic injection molds requiring thermal conductivity and lightweight construction. We maintain AS9100 aerospace quality management system certification and provide full material traceability from cast ingot through finished product for every shipment.

Our aerospace-grade 2024 aluminum sheet and plate products are manufactured and tested under a quality management system certified to AS9100 Revision D, the international standard for aerospace supplier quality assurance. Chemical composition verification uses optical emission spectrometry on samples taken from each cast ingot, with results compared against AMS-QQ-A-250/4 limits for all 12 regulated elements. Solution heat treatment is performed in furnaces calibrated to AMS 2750 Class 2 (±6°C uniformity), with continuous time-at-temperature recording for each load. Quenching utilizes polymer-glycol quenchants with controlled concentration and temperature to achieve specified cooling rates while minimizing distortion. Post-quench conductivity testing per ASTM E1004 verifies complete solution treatment on every sheet and plate. Tensile testing per ASTM E8/E8M is performed on specimens taken from each production lot in both longitudinal and long-transverse orientations. Alclad products undergo additional metallographic examination to verify cladding thickness and interface bond integrity. Plate products 6mm and above receive ultrasonic immersion testing per AMS-STD-2154. Packaging consists of interleaving each sheet with neutral pH VCI paper, stacking on steel-reinforced ISPM 15 fumigated wooden crates, vacuum sealing in aluminum barrier foil with desiccant packs for Alclad products, and securing with steel strapping. Each crate is marked with alloy, temper, heat number, dimensions, net and gross weight, purchase order reference, and handling instructions. Documentation includes the aerospace material test certificate (EN 10204 3.1), certificate of conformity, ultrasonic test report (where applicable), packing list, commercial invoice, and certificate of origin. Air freight, sea freight LCL, and full container load shipping options are available with Incoterms FOB, CIF, or DAP as required.