Aluminium alloy 5251 is a medium strength alloy with good ductility and good formability. Alloy 5251 is known for work hardening rapidly and is readily weldable. It has a high corrosion resistance particularly in marine environments.
This material is used for containers, durniture tubing, marine structures, boats, panelling and pressings, aircraft parts, silos and vehicle panels.
The most common tempers for 5251 aluminium are:
- H24 - Work hardened by rolling then annealed to half hard
- H26 - Work hardened by rolling then annealed to three quarter hard
- H22 - Work hardened by rolling then annealed to quarter hard
- O - Soft.
- Weldability - Gas: Very Good
- Weldability - Arc: Very Good
- Weldability - Resistance: Very Good
- Brazability: Poor
- Workability - Cold: Very Good
- Machinability: Average
Aluminium alloy 5251 is a readily weldable alloy. The recommended filer wire is 5356 when welding alloy 5251 to itself, 6XXX series alloys, 7XXX series alloys and most other 5XXX series alloys. When welding alloy 5251 to 5005, 5020, 1XXX series or 3XXX series alloys, the recommended filler wire is 4043.
|Manganese (Mn)||0.1 - 0.50|
|Iron (Fe)||0.50 Typical|
|Copper (Cu)||0.15 Typical|
|Magnesium (Mg)||1.7 - 2.40|
|Silicon (Si)||0.40 Typical|
|Zinc (Zn)||0.15 Typical|
|Chromium (Cr)||0.15 Typical|
|Titanium (Ti)||0.15 Typical|
Mechanical properties at room temperature
|Proof Strength||165 MPa|
|Tensile Strength||210 MPa|
|Shear Strength||125 MPa|
|Hardness Vickers||65 HV|
Reference data for some physical properties (for guidance only)
|Melting Point||625 °C|
|Thermal Expansion||25 x 10-6 /K|
|Modulus of Elasticity||70 GPa|
|Electrical Resistivity||0.044 x 10-6 Ω .m|
thyssenkrupp Materials (UK) Ltd
Information given in this data sheet about the condition or usability of materials respectively products are no warranty for their properties, but act as a description. The information, we give on for advice, comply to the experiences of the manufacturer as well as our own. We cannot give warranty for the results of processing and application of the products.