Strength in numbers

Aluminium Alloy   |   BS-L

L80 '0' Sheet

Commercial5251 - Obsolete

Nameplates, traffic (road) signs, architectural paneling. Welded tubes, chemical industry, irrigation. Offshore applications, welded structures. Pressure vessels, boilermaking.

Characteristic Properties:
Very good corrosion resistance to seawater and marine and industrial atmosphere. Very good weldability. Medium to high strength alloy for sheet products slightly lower than 5086. Medium high fatigue strength. Good cold formability.

Chemical Composition

BS 3L80(1985)
Alloy L80
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Chromium (Cr) 0.15 max
Copper (Cu) 0.15 max
Others (Total) 0.15 max
Titanium (Ti) 0.15 max
Zinc (Zn) 0.15 max
Silicon (Si) 0.4 max
Iron (Fe) 0.5 max
Manganese (Mn) 0.1 - 0.5
Magnesium (Mg) 1.7 - 2.4

The material shall be supplied annealed (O).

Alloy Designations

Aluminium alloy BS L80 - 5251 is covered by standard BS EN 3L80 (1985)

Temper Types

The most common tempers for L80 - 5251 aluminium are:

  • O

Supplied Forms

L80 - 5251 is supplied in the following forms:

  • Sheet
  • Strip

Generic Physical Properties

Physical Property Value
Density 2.69 g/cm³
Melting Point 650 °C
Thermal Expansion 23.6 x10^-6 /K
Modulus of Elasticity 70.0 GPa
Thermal Conductivity 149 W/m.K
Electrical Resistivity 37.5 % IACS

Mechanical Properties

BS 3L80(1985)
Sheet - 0.4mm to 2.6mm
Mechanical Property Value
Tensile Strength 160 Min - 200 Max N/mm2
0.2% Proof Stress 60 Min N/mm2
Elongation A50 mm 18 Min %

Mechanical properties relate to material with a nominal thickness of 0.4mm up to and including 2.6mm. The specification contains other values for different material thicknesses.