Aluminium ENAW-AlMg4.5 Plates & Sheets (EU EN, DIN, WNR)

Product Description

EN AW-AlMg4.5, famously known by its numerical designation 5083, is the highest-strength non-heat-treatable aluminum alloy in common commercial use. Under the DIN and Werkstoff-Nummer (WNr) systems, it is designated as 3.3547.

It is the industry standard for marine and cryogenic engineering due to its exceptional performance in extreme environments and its high structural efficiency.

1. Regulatory & Technical Designations

2. Chemical Composition (EN 573-3)

The name AlMg4.5 identifies the high Magnesium content, which is the primary source of its strength and corrosion resistance.

• Magnesium (Mg) [4.00 “ 4.90 Provides high strength and excellent resistance to seawater.

• Manganese (Mn) [0.40 “ 1.00 Increases fatigue strength and stabilizes grain structure.

• Chromium (Cr) [0.05 “ 0.25 Improves resistance to stress corrosion cracking.

• Aluminium (Al): Remainder.

3. Standard Tempers for Plates & Sheets

Because 5083 is not heat-treatable, its strength is derived from strain hardening (cold working).

• O (Annealed): Softest state, maximum ductility for deep drawing.

• H111: Annealed and slightly work-hardened during leveling. This is the most common temper for plates.

• H116: Specialized marine temper; provides the highest resistance to intergranular corrosion in seawater.

• H321: Strain-hardened and stabilized; often used for high-strength naval applications.

4. Mechanical Properties (EN 485-2)

Typical values for EN AW-5083 H111 plates:

5. Key Engineering Characteristics

🌊 Exceptional Marine Performance

5083 is the premier choice for shipbuilding. It maintains its integrity in salt water indefinitely and is highly resistant to both pitting and stress corrosion (especially in H116/H321 tempers).

„ï Cryogenic Excellence

Unlike most metals, AlMg4.5 does not become brittle at extremely low temperatures. Its mechanical properties actually improve at sub-zero levels, making it the preferred material for LNG (Liquefied Natural Gas) storage tanks and aerospace cryogenic fuel lines.

🔠Superior Weldability

It is designed for welding. Using 5183 or 5356 filler wire, the weld joints retain a high proportion of the base metal's strength, and the alloy is highly resistant to "hot cracking" during the welding process.

6. Typical Applications

• Marine: Ship hulls, decks, offshore rigs, and patrol boats.

• Transport: Un-braked rail cars, tipper truck bodies, and vehicle armor.

• Industrial: Pressure vessels, heat exchangers, and chemical storage tanks.

• Engineering: Precision-sawn blocks for tool and jig making.

7. Comparison: 5083 (AlMg4.5) vs. 6082 (AlSi1MgMn)