1.1 This practice is intended to cover the controls necessary to press solution heat treat some 6XXX and 7XXX series aluminum alloys at extrusion facilities when the alloy design permits them to be so treated; specific alloys are shown in Table 1. For the alloys listed in Table 1, this practice is an alternate process to solution heat treatment in a furnace, such as specified in Practice B597 for the attainment of T3, T4, T6, T7, T8 and T9-type tempers.