Strength in numbers

Aluminium Alloy   |   BS-L

L44 'F'

Commercial5251 - Obsolete

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

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

Chemical Composition

BS 5L44(1985)
Alloy L44
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Others (Total) 0.15 max
Zinc (Zn) 0.15 max
Titanium (Ti) 0.15 max
Copper (Cu) 0.15 max
Chromium (Cr) 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

Forging stock: Cast billets and slabs for hot working and extruded bars, sections and hot-rolled plate for forging shall be supplied non-heat treated. Bars for machining and extruded sections shall be supplied in one of the following conditions: Extruded and subsequently straightened; Extruded and drawn and subsequently straightened; Rolled and drawn and subsequently straightened. Note: The material may be annealed before or after straightening.

Alloy Designations

Aluminium alloy L44 - 5251 is covered by Standard BS EN 5L44 (1985) - Now Obsolete

Temper Types

The most common tempers for L44 - 5251 aluminium forging stock as as-forged ('F')

  • F

Supplied Forms

L44 - 5251 aluminium is supplied as forging stock made from cast billet, extrusion or rolled plate

  • Bar
  • Extrusions
  • Forgings
  • Castings
  • Plate

Mechanical Properties

BS 5L44(1985)
Forging Stock -
Mechanical Property Value
Elongation A50 mm 14 Min %
Elongation A 16 Min %
Tensile Strength 170 Min N/mm2
0.2% Proof Stress 60 Min N/mm2

Forgings, unless otherwise agreed in accordance with BS L100, shall be supplied as forged or annealed. No heat treatment is required. This specification covers forging stock, bars, extruded sections and forgings of aluminium - 2.25% magnesiom alloy.