Tempers of aluminum alloys, are achieved various kinds of heat treatment, designated in the international standardization and practice of the letter T followed by one, two, sometimes three or more digits.
Tx status – thermally hardenable alloys
State T applies to all products (semi-finished products) from deformable aluminum alloys 2xxx, 6and xxx 7xxx. It also applies to products made of special alloys with lithium, such as 2090 and 8090, which is subjected to thermal hardening State T applies to all products (semi-finished products) from deformable. Embodiments Tx state designated by the addition of the letter T digits 1 to 9.
The important point is a method for achieving tempered condition and control the natural aging between operations or after. Formally alloy tempered condition shall be achieved in the heat treatment furnace at a sufficient heating duration, components which would allow the aging process enter into solid solution, and sufficiently rapid cooling, to hold these components in solid solution.
Hardening in the press with separate heating and
but it is believed, Some alloys 6xxx and 7xxx series reach the same mechanical properties matter, whether they are prepared by quenching furnace heating and subsequent cooling or by cooling with hot fabrication process temperature at a rate, sufficient to keep the aging of the components in the solid solution. Therefore, for these alloys designate T3 states, T4, T6, T7, T8 and T9 are used for both these treatment options. This expanded definition quench is particularly important for manufacturers of extruded sections, which are used on a press hardening alloys 6xxx and 7xxx with hot pressing furnace temperature instead of heat treatment to achieve quenching and receiving states T3, T4, T6, T7, T8 and T9 at the minimum of their strength properties. Of these the most important conditions for producers is, apparently, T6.
Condition T6: on the press and with separate heating
Is there any difference in the properties of extruded sections in the state, for example, Condition T6: on the press and with separate heating, do not provide any pressing process temperature to obtain a solid solution and does not press on any cooling ensure retention hardening components in solution. therefore, in USA, for example, there was a long-standing practice in the supply of hardened media profiles from alloys 6xxx and 7xxx alloys, some in a state of T6, when they find, that the properties of processed profiles for both options are equivalent, and prices on the press-hardened slightly lower.