5083-H116 Aluminum: Ultimate Marine-Grade Weldable Plate
ASTM B928/B209 · Updated: 2026-05-25
5083-H116 is the premier marine-grade aluminum alloy with 4.0-4.9% Mg and 0.4-1.0% Mn, providing the highest strength among non-heat-treatable aluminum alloys. The H116 temper is specially processed to resist exfoliation corrosion and intergranular attack—critical for continuous seawater immersion. Used for naval vessel hulls (including littoral combat ships), LNG tanker spherical tanks, cryogenic applications (-196°C service), and high-speed ferry construction. Excellent weldability with ER5183 filler produces joints with 90%+ of base metal strength in the as-welded condition.
Quick Facts
| Category | Aluminum Alloy |
| Standard | ASTM B928/B209 |
| Density | 2.66 g/cm³ |
| Yield Strength | 228 MPa (33 ksi) |
| Tensile Strength | 317 MPa (46 ksi) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| EN AW-5083 | Compare |
| AlMg4.5Mn0.7 | Compare |
| A5083 | Compare |
| AA5083-H116 | Compare |
| ISO AlMg4.5Mn | Compare |
Related Materials
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Calculate the weight based on this material's density: 2.66 g/cm³
Frequently Asked Questions
What makes H116 temper different from standard H321?
H116 undergoes additional processing controls during hot rolling and annealing to prevent precipitation of beta-phase (Mg2Al3) at grain boundaries, which causes intergranular corrosion and exfoliation in marine service. H116 is mandatory for US Navy and Coast Guard aluminum structures per MIL-DTL-46027. For non-marine applications, H321 provides equivalent mechanical properties at lower cost.