5083-O Aluminum Alloy: Marine & Cryogenic Structural Plate
ASTM B209 / ASTM B928 · Published: 2026-06-02 · Updated: July 2026
5083 is the highest-strength non-heat-treatable aluminum alloy in commercial use, containing 4.0-4.9% magnesium, 0.4-1.0% manganese, and 0.05-0.25% chromium. The high magnesium content provides exceptional solid-solution strengthening; manganese...
5083 ist der highest-strength non-heat-treatable aluminum alloy in commercial verwenden, containing 4.0-4.9% magnesium, 0.4-1.0% manganese, und 0.05-0.25% chromium. Der hoch magnesium content provides exceptional fest-solution strengthening; manganese und chromium steuerung grain structure und improve stress corrosion cracking widerstand. Unlike 5xxx-series alloys mit <3% Mg (5052, 5454) which can be used at temperatures up to 150°C, 5083 with >4% Mg ist susceptible zu sensitization — continuous exposure zu temperatures über 65°C causes Mg2Al3 (beta phase) precipitation bei grain boundaries, leading zu intergranular corrosion und stress corrosion cracking in seawater.
5083 ist der standard hull plate material für hoch-geschwindigkeit aluminum ferries, military patrol boats, LNG (liquefied natural gas) carrier spherical tanks, und cryogenic storage vessels. Der alloy retains excellent toughness bei cryogenic temperatures — Charpy V-notch impact values actually increase bei -196°C compared zu room temperature, making 5083 approved für LNG containment systems operating bei -162°C. O-temper (annealed) ist used für applications requiring maximum formability; H321 (strain-hardened und stabilized) provides approximately 60% higher yield strength mit gut formability und ist der standard temper für hull plate. Welding mit 5183 oder 5356 filler rod — 5183 provides higher weld strength (matching 5083 base metal strength).
Quick Facts
| Kategorie | Aluminum Alloy |
| Norm | ASTM B209 / ASTM B928 |
| Density | 2660 kg/m³ |
| Yield Strength | 145 MPa (O temper) / 230 MPa (H321) |
| Tensile Strength | 300 MPa (O) / 320 MPa (H321) |
Global Equivalents & Cross-Reference
| Alternative Norm / Güte | Action |
|---|---|
| AA 5083-O | Compare |
| AlMg4.5Mn0.7 (EN AW-5083) | Compare |
| A95083 (UNS) | Compare |
Verwandt Materials
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Frequently Asked Questions
Warum können't 5083 sein used über 65°C?
Der hoch magnesium content (4.0-4.9%) in 5083 causes Mg2Al3 (beta phase) zu precipitate bei grain boundaries wenn der alloy ist held bei 65-200°C für extended periods (>100 hours). Der beta phase ist anodic relative zu der aluminum matrix, causing intergranular corrosion in seawater. Für applications requiring continuous exposure über 65°C, specify 5454 (2.4-3.0% Mg, immune zu sensitization) oder 6061-T6 (heat-treatable, Mg2Si precipitates, nein sensitization).
References & International Standards
- ASTM International. Norm Specifications für Stahl & Metal Alloys. astm.org
- International Organization für Standardization (ISO). Metallic Materials — Cross-Referenz Database. iso.org
- American Iron und Stahl Institute (AISI). Stahl Güte Designations & Equivalents. steel.org
- European Committee für Standardization (CEN). EN Stahl Standards & Numbering System. cencenelec.eu