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Heat treatment of aluminum alloys

Heat treatment of aluminum alloys

To achieve the maximum strength of alloys of the 6xxx group, the following sequence of heat treatments is applied:

  • heating of aluminum during pressing until all particles are completely dissolved;
  • hardening (rapid cooling (usually to the temperature of the production room, workshop);
  • hardening by aging (due to the precipitation of hardening phases).

Strict temperature control during the entire production process allows to achieve the maximum mechanical properties of aluminum profiles.

There are the following types of state of the profile material (heat treatment) according to GOST):

Designation of the grade and condition of the profile material
Condition of profile material 
Wall thickness or profile's shelf, mm
Ultimate resistance, MPa (kgf / mm2)
Yield strength, MPa (kgf /mm2)
Relative extension, %
AD31Without heat treatmentAll sizes78 (8)-16
AD31THardened and naturally aged
The same127 (13)69 (7)13
AD31T1Hardened and naturally aged
196 (20)147 (15)8
AD31T4Partially hardened and naturally aged
Up to 10 incl.108 (11)59 (6)15
АД31Т5Partially hardened and naturally aged
The same157 (16)118 (12)8


Comparison of the mechanical properties of the profiles at different heat treatments of the AD-31, 6060 and 6063 alloys.

Heat treatment type
Ultimate resistance, MPa
 Yield strength, MPa
Relative extension, %
AD-31 Т5GOST1571188
Real19015013,5
6060 Т5140-160100-1208
6063 Т5160-175110-1307-8
6060 Т6418012012
6063 Т6418012012
AD-31 Т1GOST
1961478
Real21018012,5
6060 Т6170-190140-1508
6063 Т6195-215160-1708
6060 Т66195-215150-1608
6063 Т66225-245180-2008



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Tags: Heat treatment of aluminum alloys