Strength in numbers

Aluminium Alloy   |   BS-L

L61 '0' Sheet


Equipment for heating and cooling: heat exchangers, air condition evaporators, motor vehicle radiators, freezer linings, office equipment. Tubing, piping, containers, closures. Cladding alloy. Pressure vessels, aircraft and military components.

Characteristic Properties:
Very good resistance to atmospheric corrosion. Very good weldability. Good formability by pressing, drawing and roll forming. Medium strength alloy. Better mechanical properties (in particular at elevated temperatures) than 1xxx-alloys. Properties very close to those of 3003.

Precautions and Warnings:
Actual performance requires careful design of tools, lubrication and metal surface condition.

Chemical Composition

BS 4L61(1985)
Alloy L61
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Copper (Cu) 0.1 max
Chromium (Cr) 0.1 max
Titanium + Zirconium (Ti+Zr) 0.1 max
Others (Total) 0.15 max
Zinc (Zn) 0.2 max
Magnesium (Mg) 0.3 max
Silicon (Si) 0.5 max
Iron (Fe) 0.7 max
Manganese (Mn) 0.9 - 1.5

The material shall be supplied annealed (O).

Alloy Designations

Aluminium alloy L61 - 3103 is covered by standard BS EN 4L61 (1985)

Temper Types

The most common tempers for L61 - 3103 aluminium is:

  • O

Supplied Forms

L61 - 3103 aluminium is supplied in the following forms:

  • Sheet
  • Strip

Generic Physical Properties

Physical Property Value
Density 2.73 g/cm³
Melting Point 655 °C
Thermal Expansion 23.1 x10^-6 /K
Modulus of Elasticity 69.5 GPa
Thermal Conductivity 160 W/m.K
Electrical Resistivity 42 % IACS

Mechanical Properties

BS 4L61(1985)
Sheet - 0.4mm to 0.8mm
Mechanical Property Value
Tensile Strength 90 Min - 130 Max N/mm2
Elongation A50 mm 20 Min %

Mechanical properties relate to material with a nominal thickness of 0.4mm up to and including 0.8mm. The specification contains other values for different material thicknesses.