Strength in numbers

Aluminium Alloy   |   BS-L

5L34 'F' / 'O'

Commercial1200 - Obsolete

Metal work, license plates, identification plates. Kitchenware, packaging foils, containers, automotive trim, heat exchanger strip, radiator tubes. Aircraft and military highly stressed structures.

Characteristic Properties:
Very good atmospheric corrosion resistance and workability. High thermal conductivity and reflectivity but lower than for 1050A. Very good weldability. Slightly higher strength than 1050A.

Chemical Composition

BS 5L34(1985)
Alloy L34
Chemical Element % Present
Titanium (Ti) 0.05 max
Manganese (Mn) 0.05 max
Copper (Cu) 0.05 max
Other (Each) 0.05 max
Zinc (Zn) 0.1 max
Others (Total) 0.15 max
Silicon + Iron (Si+Fe) 1 max
Aluminium (Al) 99 min

Cast billets & slabs for hot working and extruded bars, sections and hot-rolled plate for forging shall be supplied non-heat treated. Bars for machining & extruded sections shall be supplied in one of the following conditions: Extruded; Extruded & Drawn; Rolled & Drawn and subsequently straightened. Forgings, unless otherwise agreed in accordance with BS L100, shall be supplied as forged or annealed. No heat treatment is required.

Alloy Designations

Aluminium alloy 5L34 - 1200 is covered by Standard BS EN 5L34 (1985) - Now Obsolete.

Temper Types

The most common tempers for 5L34 - 1200 aluminium are as forged 'F' or fully annealed 'O'

  • F
  • O

Supplied Forms

5L34-1200 aluminium is supplied as forging stock and forgings made from cast billet, extruded stock or rolled plate

  • Bar
  • Extrusions
  • Forgings
  • Plate
  • Castings

Generic Physical Properties

Physical Property Value
Density 2.59 g/cm³
Melting Point 657 °C
Thermal Expansion 23.4 x10^-6 /K
Modulus of Elasticity 69 GPa
Thermal Conductivity 225 W/m.K
Electrical Resistivity 58.5 % IACS

Mechanical Properties

BS 5L34(1985)
Mechanical Property Value
Elongation A50 mm 18 Min %
Tensile Strength 65 Min MPa

The specification covers forging stock, bars, extruded sections and forgings of 99% aluminium. This specification was declared obsolescent on 01 April 1999. It is no longer recommended for use on new designs.