Strength in numbers

Aluminium Alloy   |   BS-L

L98 T4 Plate

Commercial2024 - Obsolete

High strength fabricated or machined items in aircraft industries, general engineering, machinery, military equipment, truck wheels. Screw machine products. Structural applications. Rivets.

Characteristic Properties:
Heat treatable alloy. Very good machining characteristics. High strength alloy with a strength slightly higher than 2014(A) and 2017A and 2030. High fatigue strength. Suitable for welding only by resistance welding. Corrosion resistance only with cladding or other protection.

Chemical Composition

BS 2L98(1971)
Alloy L98
Chemical Element % Present
Aluminium (Al) balance
Tin (Sn) 0.05 max
Lead (Pb) 0.05 max
Nickel (Ni) 0.05 max
Chromium (Cr) 0.1 max
Zinc (Zn) 0.2 max
Titanium + Zirconium (Ti+Zr) 0.2 max
Iron (Fe) 0.5 max
Silicon (Si) 0.5 max
Manganese (Mn) 0.3 - 0.9
Magnesium (Mg) 1.2 - 1.8
Copper (Cu) 3.8 - 4.9

Heat Treatment Materail shall supplied solution treated, and aged at room temperature. If agreed between the manufacturer and the purchaser, the material shall be supplied in one of the following conditions, as stated on the order. As rolled Annealed Heat treatment shall be carried out as follows: Solution treat by heating at a temperature of 495C +/- 5C and quenching in water at a temperature not exceeding 40C. Age at room temperature for not less than 48 hours.

Alloy Designations

Aluminium alloy L98 - 2024 is covered by standard BS 2L98 (1971) - (now obsolete)

Temper Types

The most common temper for L98 - 2024 aluminium is:

  • T4

Supplied Forms

L98 - 2024 aluminium is supplied in the following forms:

  • Plate

Generic Physical Properties

Physical Property Value
Density 2.79 g/cm³
Melting Point 640 °C
Thermal Expansion 23.10 x10^-6 /K
Modulus of Elasticity 73 GPa
Thermal Conductivity 121 W/m.K

Mechanical Properties

BS 2L98(1971)
Plate - 6mm to 12.5mm
Mechanical Property Value
Elongation A50 mm 10 Min %
Tensile Strength 410 Min N/mm2
0.2% Proof Stress 260 Min N/mm2

This specification covers plate of aluminium- copper-magnesium-manganese alloy solution treated and aged at room temperature:not controlled stretched. The mechanical property values specified apply to tests carried out in the long transverse direction for material with nominal thickness over 6mm up to and including 12.5mm. Different values for additional nominal thicknesses and test conditions are shown in the specification