Machinery's Handbook, 31st Edition
530 ALUMINUM AND Aluminum Alloys -T2, annealed (cast products only): Designates a type of annealing treatment used to improve ductility and increase dimensional stability of castings. -T3, solution heat treated and then cold-worked: Applies to products that are cold- worked to improve strength, or in which the effect of cold-work in flattening or straighten ing is recognized in applicable specifications. -T4, solution heat treated and naturally aged to a substantially stable condition: Applies to products that are not cold-worked after solution heat treatment, or in which the effect of cold-work in flattening or straightening may not be recognized in applicable specifications. -T5, artificially aged only: Applies to products that are artificially aged after an elevated- temperature rapid-cool fabrication process, such as casting or extrusion, to improve mechanical properties or dimensional stability, or both. -T6, solution heat treated and then artificially aged: Applies to products that are not cold-worked after solution heat treatment, or in which the effect of cold-work in flattening or straightening may not be recognized in applicable specifications. -T7, solution heat treated and then stabilized: Applies to products that are stabilized to carry them beyond the point of maximum hardness, providing control of growth or resid ual stress or both. -T8, solution heat treated, cold-worked, and then artificially aged: Applies to products that are cold-worked to improve strength, or in which the effect of cold-work in flattening or straightening is recognized in applicable specifications. -T9, solution heat treated, artificially aged, and then cold-worked: Applies to products that are cold-worked to improve strength. -T10, artificially aged and then cold-worked: Applies to products that are artificially aged after an elevated-temperature rapid-cool fabrication process, such as casting or extrusion, and then cold-worked to improve strength. Additional digits may be added to designations -T1 through -T10 to indicate a variation in treatment that significantly alters the characteristics of the product. These may be arbi trarily assigned and registered with The Aluminum Association for an alloy and product to indicate a specific treatment or specific mechanical property limits. These additional digits have been assigned for wrought products in all alloys: -T___51, stress-relieved by stretching: Applies to products that are stress-relieved by stretching the following amounts after solution heat treatment: Plate 1 1 ⁄ 2 to 3 percent permanent set Rod, Bar and Shapes 1 to 3 percent permanent set Drawn tube 0.5 to 3 percent permanent set Applies to extruded rod and bar shapes and tube when designated as follows: -T___510 : Products that receive no further straightening after stretching. -T___511: Products that receive minor straightening after stretching to comply with standard tolerances. -T___52, stress-relieved by compressing: Applies to products that are stress-relieved by compressing after solution heat treatment to produce a nominal permanent set of 2 1 ⁄ 2 percent. -T___54, stress-relieved by combined stretching and compressing: Applies to die forg ings that are stress relieved by restriking cold in the finish die. The following two-digit -T temper designations have been assigned for wrought prod ucts in all alloys: Applies directly to plate and rolled or cold-finished rod and bar. These products receive no further straightening after stretching.
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