BS L 115:1971 pdf download.Plate of aluminium- magnesium-silicon- manganese alloy .
NOTE 1 This British Standard covers plate, including that which has been forged as an intermediate operation, which is finished by hot or cold rolling. It does not cover forged plate which should be ordered to BS L 112.
NOTE 2 If material to this British Standard is re-solution treated but not again controlled stretched, it must be regarded as being in the solution treated and precipitation treated, but not controlled stretched, condition, even though the specified mechanical properties are obtained.
NOTE 3 Other forms of material of similar composition and in the same heat treatment condition are covered by the following British Standards:
BS L 111, Bars and extruded sections.
BS L 112, Forging stock and forgings.
BS L 113, Sheet and strip.
BS L 114, Tube.
1 Inspection and testing procedure
This British Standard shall be used in conjunction with Sections 1 and 14 of BS L 100.
2 Quality of material
The material shall be made from aluminium and alloying constituents, with or without approved
scrap, at the discretion of the manufacturer.
4 Condition
4.1 Except as provided in 4.2, the material shall be supplied solution treated, controlled stretched, to a permanent extension of not less than 1" % nor more than 3 %, and precipitation treated.
4.2 If agreed between the manufacturer and the purchaser and stated on the order, the material
shall be supplied solution treated and controlled stretched to a permanent extension of not less
than 1" % nor more than 3 %. No other alternative condition of supply is permissible.
5 Heat treatment
The material shall be heat treated as follows:
1) Solution treat by heating uniformly at a temperature between 510 °C and 540 °C and
quenching in water.
2) Precipitation treat by heating uniformly at a temperature between 165 °C and 195 °C
for 3 hours to 12 hours.
6 Mechanical properties
6.1 Tensile test. The mechanical properties obtained from test pieces selected and prepared in
accordance with the relevant requirements of BS L 100 shall be not less than the following values:BS L 115 pdf download.