Strength in numbers

Aluminium Alloy   |   BS-L

L158 T4 Sheet


Aluminium alloy L158 – 2014A is a medium strength sheet and strip specification.

Chemical Composition

BS L158(1978)
Alloy L158
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Chromium (Cr) 0.1 max
Nickel (Ni) 0.1 max
Titanium (Ti) 0.15 max
Others (Total) 0.15 max
Titanium + Zirconium (Ti+Zr) 0.2 max
Zinc (Zn) 0.25 max
Iron (Fe) 0.5 max
Magnesium (Mg) 0.2 - 0.8
Silicon (Si) 0.5 - 0.9
Manganese (Mn) 0.4 - 1.2
Copper (Cu) 3.9 - 5

Alloy Designations

Aluminium alloy L158 has similarities to the following standard designations and specifications but may not be a direct equivalent:


Temper Types

The most common tempers for L158 aluminium are as rolled and:

  • T4

Supplied Forms

L158 aluminium is supplied as Clad Sheet and Strip.

  • Sheet
  • Strip

Generic Physical Properties

Physical Property Value
Density 2.80 g/cm³
Melting Point 640 °C
Thermal Expansion 22.8 x10^-6 /K
Modulus of Elasticity 73 GPa
Thermal Conductivity 155 W/m.K
Electrical Resistivity 40 % IACS

Mechanical Properties

BS L158(1978)
Sheet -
Mechanical Property Value
Proof Stress 255 Min MPa
Tensile Strength 400 Min MPa
Elongation A50 mm 14 Min %