EN AW-5049 (Marine-Grade General Purpose Al-Mg)

Description

EN AW-5049 (AlMg2Mn0.8) per EN 573-3. Mg (1.6-2.5%) gives a practical mid-tier 5xxx alloy -- better strength than 5052 (1.8-2.8% Mg overlaps but 5049 adds Mn for grain refinement and formability), good weldability and marine corrosion resistance, at lower cost than the higher-Mg 5083/5086. Standard for general marine fabrication, boat hulls in the small-to-medium size range, and structural sheet metal work where full 5083 strength is not required.

Key Properties — H34 -- half hard stabilised

Rm (Tensile Strength)

220 – 270

MPa

Re / Rp0.2 (Yield)

140

MPa

A₅ (Elongation)

≥ 7.0

Hardness

60 – 80

E (Young's Modulus)

GPa

Density

2.68

g/cm³

Main Designations (5)

Standard Body	Designation	Country / Region	Note
EN	EN AW-5049 / AlMg2Mn0.8	EU
AA	5049	USA
ASTM	B209 Alloy 5049	USA
UNS	A95049	USA (UNS)
JUS	AlMg2Mn opca namjena marina; nema JUS	Yugoslavia/BiH	5049 opca marinska Al legura

Standards (5)

#	Standard Body	Designation	Country / Region	Note
1	EN	EN AW-5049 / AlMg2Mn0.8	EU	—
2	AA	5049	USA	—
3	ASTM	B209 Alloy 5049	USA	—
4	UNS	A95049	USA (UNS)	—
5	JUS	AlMg2Mn opca namjena marina; nema JUS	Yugoslavia/BiH	5049 opca marinska Al legura

All values in wt.%

Magnesium

1.6000 – 2.5000

Manganese

0.5000 – 1.1000

Chromium

≤ 0.2500

Element	Symbol	Min %	Max %	Typical %
Magnesium	Mg	1.6000	2.5000	2.0000
Manganese	Mn	0.5000	1.1000	0.8000
Chromium	Cr	—	0.2500	0.1200

Mechanical Properties

Condition	Code	Rm min MPa	Rm max MPa	Re min MPa	Re max MPa	A₅ min %	Z %	KV J	HB min	HB max	HRC min	HRC max	E GPa
H34 -- half hard stabilised	H34	220	270	140	—	7.0	—	—	60	80	—	—	70.0
O -- Annealed	O	190	240	80	—	16.0	—	—	45	60	—	—	70.0

Physical Properties

Density

2.680

g/cm³

Melting Point

600–650

°C

Young's Modulus

70.0

GPa

Poisson's Ratio

0.330

—

Thermal Conductivity

140.0

W/m·K

Thermal Expansion

23.80

×10⁻⁶ /K

Specific Heat

900

J/kg·K

Electrical Resistivity

0.0510

µΩ·m

Magnetic

Heat Treatment

Annealing

Temperature:340°C – 410°C

Medium:Furnace

Duration:1-3 h

Cooling:Air or water cool

Hardness After:HB 45-60

Stress Relief / Stabilising

Temperature:120°C – 150°C

Medium:Oven

Duration:2-3 h

Cooling:Air cool

Hardness After:H34 properties maintained

Prevents age-softening in service.

NOT precipitation hardenable

Medium:5xxx alloy -- strength from Mg content and cold work only

Duration:N/A

Cooling:N/A

Hardness After:N/A

Good weldability

Medium:GMAW/GTAW with 5183 or 5356 filler -- standard marine aluminium welding practice

Duration:N/A

Cooling:N/A

Hardness After:N/A

Machinability

Machinability Rating

relative to AISI B1112 = 100%

420.0%

Excellent

Turning Speed (HSS)

430

m/min

Turning Speed (Carbide)

1,750

m/min

Feed Rate (Turning)

0.680

mm/rev

Drilling Speed (HSS)

390

m/min

Milling Speed (Carbide)

1,750

m/min

Coolant	Flood or MQL
Chip Formation	Medium ductile chips
Tool Material	Carbide K10/K20; HSS M2 acceptable
Surface Finish	Ra 0.8-3.2 um

Good machinability.

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.

Technical 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.