Aluminum 5251 (annealed) Material Data Sheet

Aluminum 5251 Designation

5251, wrought
Condition	O (Annealed)
UNS number	A95251
EN name	EN AW-5251 (EN AW-Al Mg2)
EN number	3.3525

Aluminum 5251 Typical uses

Sheet metal work, marine applications – seawater desalination equipment, cryogenic use, welded pressure vessels, commercial vehicle trim, shipbuilding applications – hulls & superstructures, can manufacture & cooking utensils, HGV manufacture

Aluminum 5251 Composition detail

Al (aluminum)	95.4	–	98.2	%
Cr (chromium)	0	–	0.15	%
Cu (copper)	0	–	0.15	%
Fe (iron)	0	–	0.5	%
Mg (magnesium)	1.7	–	2.4	%
Mn (manganese)	0.1	–	0.5	%
Si (silicon)	0	–	0.4	%
Ti (titanium)	0	–	0.15	%
Zn (zinc)	0	–	0.15	%
Other	0	–	0.15	%

Aluminum 5251 Physical properties

Density

2.66

–

2.72

g/cm³

Aluminum 5251 Mechanical properties

Young’s modulus	70	–	74	GPa
Specific stiffness	26	–	27.6	MN.m/kg
Yield strength (elastic limit)	60	–	76	MPa
Tensile strength	160	–	200	MPa
Specific strength	22.3	–	28.3	kN.m/kg
Elongation	14	–	25	% strain
Compressive strength	60	–	76	MPa
Flexural modulus	70	–	74	GPa
Flexural strength (modulus of rupture)	60	–	76	MPa
Shear modulus	25	–	27	GPa
Bulk modulus	65	–	72	GPa
Poisson’s ratio	0.325	–	0.335
Shape factor	42
Hardness – Vickers	44	–	48	HV
Hardness – Brinell	45	–	50	HB
Elastic stored energy (springs)	25.3	–	39.7	kJ/m³
Fatigue strength at 10^7 cycles	40	–	50	MPa
Fatigue strength model (stress range) _{Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles}	35.2	–	56.9	MPa

Aluminum 5251 Impact & fracture properties

Fracture toughness	34	–	36	MPa.m^0.5
Toughness (G)	16	–	18.1	kJ/m²

Aluminum 5251 Thermal properties

Melting point	605	–	650	°C
Maximum service temperature	150	–	170	°C
Minimum service temperature	-273			°C
Thermal conductivity	146	–	152	W/m.°C
Specific heat capacity	882	–	918	J/kg.°C
Thermal expansion coefficient	23	–	24.2	µstrain/°C
Thermal shock resistance	35.2	–	45	°C
Thermal distortion resistance	6.11	–	6.52	MW/m
Latent heat of fusion	384	–	393	kJ/kg

Aluminum 5251 Electrical properties

Electrical resistivity	4.5	–	4.7	µohm.cm
Electrical conductivity	36.7	–	38.3	%IACS
Galvanic potential	-0.81	–	-0.73	V

Aluminum 5251 Magnetic properties

Magnetic type

Non-magnetic

Aluminum 5251 Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	5100	–	5250	m/s
Mechanical loss coefficient (tan delta)	1e-4	–	0.002

Aluminum 5251 Processing properties

Metal casting	Unsuitable
Metal cold forming	Acceptable
Metal hot forming	Limited use
Metal press forming	Acceptable
Metal deep drawing	Limited use
Machining speed	168 m/min
Weldability _{Notes: Preheating and post weld heat treatments are not required}	Good

Aluminum 5251 Durability

Water (fresh)	Excellent
Water (salt)	Acceptable
Weak acids	Excellent
Strong acids	Excellent
Weak alkalis	Acceptable
Strong alkalis	Unacceptable
Organic solvents	Excellent
Oxidation at 500C	Unacceptable
UV radiation (sunlight)	Excellent
Galling resistance (adhesive wear) _{Notes: Aluminum alloys perform poorly when self-mated but can be processed without galling when mated with steels.}	Limited use
Flammability	Non-flammable