Custom aluminum sunflower radiator

Product name: Custom aluminum sunflower radiator
Material: 6063-T5
Processing: Precision machining, standard sandblasted oxidation
Features: Energy saving and environmental protection, easy to machine, excellent surface treatment, lightweight, and high strength.

Why do we use T5 instead of T6 for the radiators?
T5 is extruded after air-cooled aging, its Wechsler hardness reaches 9-12 degrees, T6 is extruded after water-cooled aging, its Wechsler hardness will reach 12-15 degrees, but it will lead to deformation of the radiator base plate and radiator teeth.