What's the performances and applications of 5251 Aluminum Sheets?

You are here: Home » Blog » What's the performances and applications of 5251 Aluminum Sheets?

What's the performances and applications of 5251 Aluminum Sheets?

Views: 0 Author: Site Editor Publish Time: 2025-07-29 Origin: Site

Aluminum alloy 5251 is a medium-strength alloy with good ductility, thus exhibiting excellent formability. It is known for rapid work hardening and is easy to weld. Additionally, it boasts high corrosion resistance, especially in marine environments.

Applications

Aluminum alloy 5251 is typically used in:

Ships

Panels and stampings
Marine structures
Aircraft parts
Vehicle panels
Furniture tubes
Silos
Container

The following mechanical properties apply to the H22 temper.

Chemical Elements	(%) (Content)
Manganese, Mn	0.10 - 0.50
Copper, Cu	0.0 - 0.15
Magnesium, Mg	1.70 - 2.40
Silicon, Si	0.0 - 0.40
Zinc, Zn	0.0 - 0.15
Chromium, Cr	0.0 - 0.15
Titanium, Ti	0.0 - 0.15
Others, each	0.0 - 0.05
Others, total	0.0 - 0.15
Iron, Fe	0.0 - 0.50
Aluminum, Al	Remain

5251 Aluminum sheets Physical Properties

Physical Properties	Value
Density	2.69 g/cm³
Melting Point	625°C
Thermal Expansion	25 x 10⁻⁶ /K
Elastic Modulus	70 GPa
Thermal Conductivity	134 W/mK
Electrical Resistivity	0.044 x 10⁻⁶ Ω·m

Specification: BS EN 485-2:2008
Sheets and Plates - 0.2mm to 25mm

Mechanical Properties	Value
Proof Stress	Min. 120 MPa
Tensile Strength	190 - 230 MPa
Brinell Hardness	56 HB

Alloy

Aluminum alloy 5251 corresponds to the following standard names and specifications, but may not be directly equivalent:

Aluminium Magnesium 2

Aluminium 2.0Mg 0.3Mn

5251 Aluminum sheet Temper

Temper Types	Description
H24	Work-hardened by rolling, then annealed to half-hard
H26	Work-hardened by rolling, then annealed to three-quarter hard
O	Soft
H22	Work-hardened by rolling, then annealed to quarter hard

5251 Aluminum sheet Weldability

Aluminum alloy 5251 is an easily weldable alloy.

When welding alloy 5251 to itself, 6XXX series alloys, 7XXX series alloys, and most other 5XXX alloys, the recommended filler wire is 5356.

When welding alloy 5251 to 5005, 5020, 1XXX series, or 3XXX series alloys, the recommended filler wire is 4043.

Weldability - Gas: Very good

Weldability - Arc: Very good

Weldability - Resistance: Very good

Brazability: Poor

5251 Aluminum sheet Manufacturing

Machinability - Cold: Very good

Machinability: Average

Aluminum alloy 5251 stands out as a versatile medium-strength alloy, offering a favorable balance of formability, corrosion resistance, and weldability. Its well-defined chemical composition, reliable mechanical and physical properties across common tempers (such as H22, H24, H26, and O), and adaptability in manufacturing processes make it suitable for a wide range of applications—from marine and automotive components to furniture and industrial containers. For specific project requirements or further details on temper variations, welding techniques, or material sourcing, feel free to consult us or for tailored guidance.