5251 Aluminum Sheet
5251 aluminum sheet is a medium-strength non-heat-treatable Al-Mg alloy belonging to the 5xxx series, formulated with magnesium and chromium additions to deliver balanced mechanical strength, excellent corrosion resistance and reliable weldability. As a versatile aluminum material, it serves as a cost-effective solution for shipbuilding, container manufacturing, mechanical parts, architectural decoration and other industrial sectors.
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Overview
5251 aluminum sheet is a non-heat-treatable, medium-strength Al-Mg alloy known for its excellent ductility, formability, weldability, and corrosion resistance. Strengthened through cold working rather than heat treatment, it's suitable for stamping, bending, and spinning processes. Its lightweight nature, high plasticity, and marine-grade durability make it a versatile, cost-effective choice for shipbuilding, offshore platforms, transportation, container manufacturing, mechanical parts, and architectural decoration.
Specification
Alloy: 5251
Temper: O, H22, H26, H32, H34, H321
Thickness: 0.2-250mm
Width: 900-3800mm
Length: Customized
Feature
Excellent marine corrosion resistance: The Al-Mg matrix with chromium addition forms a stable passive oxide film, delivering outstanding resistance to seawater, salt spray and chloride ion corrosion, suitable for long-term service in coastal and offshore marine environments.
Outstanding weldability: Compatible with MIG, TIG and other mainstream welding processes, with high weld joint strength retention and good sealing performance, ensuring structural integrity of welded assemblies.
Balanced strength and formability: Medium structural strength matches good ductility; O temper supports deep drawing, bending and stamping processes, adapting to the fabrication of components with complex shapes.
Good fatigue resistance: Effectively resists cyclic alternating loads caused by vibration and fluid impact, suitable for long-term service of pressure vessels and ship structures under dynamic working conditions.
Good machinability: Supports cutting, milling, punching and other precision processing, with high dimensional accuracy, meeting the processing requirements of diverse industrial scenarios.
Significant lightweight advantage: With a density only about one-third that of steel, it effectively reduces structural dead weight, lowering transportation, installation and maintenance costs.
Application
5251 aluminum sheet is widely used across multiple sectors. In marine engineering, its seawater corrosion resistance makes it ideal for small vessel hulls, decks, and railings. In construction, it serves in roofing, curtain walls, decorative panels, and modern lightweight designs. In aerospace, it forms non-structural aircraft components like ceiling panels. It is also common in stamped parts, containers, electrical panels, and automotive non-load-bearing body parts for weight reduction. Additionally, its food-safe, corrosion-resistant, and easy-to-clean properties make it a preferred material for food processing equipment and packaging systems.
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