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Although the properties and characteristics of wrought aluminium alloy products are significantly influenced by their complete thermal history, including the heating associated with hot working, the most important effects are those established by the final heat treating operations...
Heat treating, defined broadly, includes all of the controlled heating and cooling operations performed on a metal or alloy in the solid state for the purpose of altering its structure or properties. The thermal processes applied to ingots prior to working and during the intermediate stages of fabrication, as well as those employed after the final working operation, come under this broad definition.
Although the properties and characteristics of wrought aluminium alloy products are significantly influenced by their complete thermal history, including the heating associated with hot working, the most important effects are those established by the final heat treating operations.
The temper designation system, according to ANSI H35.1(M), is used for all forms of wrought and cast aluminium and aluminium alloy, except ingot. It is based on the sequences of basic treatments used to produce the various tempers. The temper designation follows the alloy designation, the two being separated by a hyphen.
Basic temper designations consist of letters. Subdivisions of the basic tempers, where required, are indicated by one or more digits following the letter. These designate specific sequences of basic treatments, but only operations recognized as significantly influencing the characteristics of the product are indicated. If some other variation of the same sequence of basic operations is applied to the same alloy, resulting in different characteristics, additional digits are added to the designation.
The basic temper designations are as follows:
The T is always followed by one or more digits. Numerals 1 through 10 indicate specific sequences of treatments:
A period of natural aging may occur between the operations listed for tempers T3 through T10. Control of this period may be necessary to achieve the desired characteristics.
The following designations involving additional digits are assigned to stress-relieved tempers of wrought products:
(a) The letter x represents digits 3, 4, 6, or 8, whichever is applicable.
The following temper designations are assigned to some wrought products that are heat treated by the user:
(b) Exceptions not conforming to these definitions are 4032-T62 and 6101-T62.
Date Published: Feb-2001
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