◎The hardness is for reference only
◎T4:Solution heat-treated 4 and naturally aged to a substantially stable condition;T42: solution heat-treated from annealed or F temper and naturally aged to a substantially stable condition;
◎T6: Solution heat treated 4 and then artificially aged;T62:solution heat-treated from annealed or F temper and artificially aged;
◎T61: solution heat-treated and then artificially aged in underageing conditions to improve formability
◎T451、T651:Stretched the indicated amounts after solution heat-treatment or after cooling from an elevated temperature shaping process,For example, plates: 1.5 to 3% permanent set (deformation)
◎T6151: solution heat-treated, stress-relieved by stretching a controlled amount (permanent set 0,5 % to 3 % for sheet, 1,5 % to 3 % for plate) and then artificially aged in underageing conditions to improve formability. The products receive no further straightening after stretching。