3mm Thickness 8x4 Aluminum Sheet 5083 For Boat

Marine builders choose materials that survive salt spray, wave impact, and years of cyclic loading without becoming a maintenance burden. 3mm thickness 8x4 aluminum sheet 5083 is a proven marine-grade plate/sheet option used worldwide for boat hulls, decks, bulkheads, and structural panels. With strong resistance to seawater corrosion and excellent weldability, 5083 is often selected when reliability matters more than cosmetic perfection.

5083 is a non-heat-treatable aluminum-magnesium alloy designed for high performance in aggressive environments. In marine use, its strengths show up in three ways:

• it resists saltwater corrosion better than many general-purpose alloys
• it welds well with common marine filler wires
• it retains good strength after welding compared with some alternatives

An 8x4 sheet format is commonly specified because it suits standard cutting plans, nesting, and shop handling. At 3mm thickness, it is frequently used for skins, internal panels, superstructure parts, and light structural components, depending on design and classification rules.

Features for Boatbuilding

Typical Marine Applications

Material selection should always follow the vessel's scantling rules, design loads, and welding procedure requirements. For critical hull structure, confirm temper, quality standard, and inspection requirements with your yard or surveyor.

Chemical Composition (Typical Limits)

5083 is defined by controlled magnesium and manganese content, supporting marine corrosion resistance and strength. Values below are typical specification limits; exact limits depend on the governing standard.

Temper Options and What They Mean

Because 5083 is non-heat-treatable, strength is achieved primarily through work hardening (strain hardening). The right temper depends on whether you prioritize forming, strength, or a balance.

Availability of H116 and H321 may vary by mill and region, but they are frequently requested for marine hull plating because they are optimized for seawater exposure.

Mechanical Properties (Typical)

Actual mechanical properties depend on product thickness, mill practice, and standard. The values below are widely used typical ranges for guidance only.

For design-critical work, confirm minimums to the governing standard and request mill test certificates.

3mm 8x4 Sheet Technical Specifications

"8x4" typically refers to 8 ft × 4 ft sheet size. In metric supply chains, this is often close to 2440 mm × 1220 mm. Confirm exact cut size and tolerances for CNC nesting.

Reference Weight (Helps with Logistics)

Weight can vary slightly with actual cut size and thickness tolerance.

Corrosion Performance in Marine Service

5083 is widely respected for seawater exposure, especially in H116/H321 tempers. In real boats, corrosion performance is influenced as much by design and workmanship as by alloy choice. Good outcomes typically come from:

• avoiding crevices that trap stagnant saltwater
• isolating dissimilar metals to reduce galvanic corrosion
• using correct weld filler and cleaning practices
• sealing lap joints and keeping drainage paths open

If the boat will see elevated temperatures for long periods, discuss sensitization considerations and temper selection with your supplier or welding engineer.

Fabrication Notes for Customers

Ordering Checklist (Quick Confirmation)