EN AW-5049 -- moderate-Mg general-purpose marine and structural aluminium. Rm 220-270 MPa, good corrosion resistance and weldability at lower cost than 5083. For boat hulls, general marine fabrication and structural sheet where 5083-level strength is not required.
Standards
| Standard Body |
Designation |
Country |
| EN |
EN AW-5049 / AlMg2Mn0.8 |
EU |
| AA |
5049 |
USA |
| ASTM |
B209 Alloy 5049 |
USA |
| UNS |
A95049 |
USA |
| JUS |
AlMg2Mn opca namjena marina; nema JUS |
Yugoslavia/BiH |
Composition (wt.%)
| Element |
Symbol |
Min % |
Max % |
Typical % |
| Magnesium |
Mg |
1.600 |
2.500 |
2.000 |
| Manganese |
Mn |
0.500 |
1.100 |
0.800 |
| Chromium |
Cr |
— |
0.250 |
0.120 |
Physical
Melting Range
600 – 650
°C
Thermal Conductivity
140
W/mK
Thermal Expansion
23.8
×10⁻⁶/K
Machinability
| Rating |
420.0% (B1112=100%) |
| Turning HSS |
430.0 m/min |
| Turning Carbide |
1750.0 m/min |
| Surface Finish |
Ra 0.8-3.2 um |
| Coolant |
Flood or MQL |
Mechanical
| Condition |
Rm (MPa) | Re (MPa) | A (%) |
HB | HRC | KV (J) | E (GPa) |
| H34 -- half hard stabilised (H34) |
220 – 270 |
≥140 |
≥7 |
60 – 80 |
— |
— |
70 |
| O -- Annealed (O) |
190 – 240 |
≥80 |
≥16 |
45 – 60 |
— |
— |
70 |
Heat Treatment
| Process |
Temperature |
Medium |
Duration |
Hardness After |
| Annealing |
340 – 410°C |
Furnace |
1-3 h |
HB 45-60 |
| Stress Relief / Stabilising |
120 – 150°C |
Oven |
2-3 h |
H34 properties maintai |
| NOT precipitation hardenable |
— |
5xxx alloy -- strength from |
N/A |
N/A |
| Good weldability |
— |
GMAW/GTAW with 5183 or 5356 |
N/A |
N/A |
Applications
Boat Hulls: Small-to-medium boat and small craft hull plating.
Marine Fabrication: General marine structural sheet metal work and fittings.
Structural Sheet: General-purpose structural sheet applications requiring moderate strength and good weldability.
Notes
5049 vs 5052 vs 5083 for marine use: 5052: excellent corrosion resistance, good formability, Rm ~230 MPa H32, the most common general marine sheet. 5049: similar strength tier to 5052 with slightly different alloying balance, regionally common alternative. 5083: highest strength of the practical marine 5xxx grades, for larger vessels and structural marine applications. For small craft and general marine fabrication, 5049 and 5052 serve essentially the same role.