6060-T66

6060 with controlled composition for higher strength: 160 MPa proof and 215 MPa tensile up to 5 mm.

T66 is a European temper (EN 515): higher properties than T6, reached with a little more Mg and Si. That is also why its HAZ values are slightly higher than T6's. Eurocode 9 still uses the 3 mm band of the older EN 755-2.

Wall thicknessmm

0.2 % proof strength Rp0.2: ≥ 150MPa
Corroborated5–25 mm
Tensile strength Rm: ≥ 195MPa
Corroborated5–25 mm
Elongation after fracture A: ≥ 8%
Corroborated5–25 mm · A (L₀ = 5.65√S₀)
Characteristic proof strength fo: 150MPa
From the standard3–25 mm
Characteristic ultimate strength fu: 195MPa
From the standard3–25 mm
HAZ proof strength fo,haz: 65MPa
From the standard3–25 mm
HAZ ultimate strength fu,haz: 110MPa
From the standard3–25 mm

All values

Identity and composition 8
Mechanical 6
Design values 8
Physical not yet
Thermal not yet
Fire not yet
Chemical and durability not yet

Mechanical

Strength

0.2 % proof strength Rp0.2

Minimum 0.2 % proof strength guaranteed by the product standard.

Condition	Value	Evidence
	≥ 160MPa	Single source1
	≥ 150MPa	Corroborated

Tensile strength Rm

Ultimate tensile strength. Product standards give a range or a minimum.

Condition	Value	Evidence
	≥ 215MPa	Single source1
	≥ 195MPa	Corroborated

Ductility

Elongation after fracture A

Minimum elongation; depends on gauge length and test direction.

Condition	Value	Evidence
	≥ 8%	Single source
	≥ 8%	Corroborated

Design values

Characteristic proof strength fo

fo for design to Eurocode 9 (before partial factors).

Condition	Value	Evidence
	160MPa	From the standard
	150MPa	From the standard

Characteristic ultimate strength fu

fu for design to Eurocode 9.

Condition	Value	Evidence
	215MPa	From the standard
	195MPa	From the standard

HAZ proof strength fo,haz

0.2 % proof strength in the heat-affected zone of a weld (Eurocode 9).

Condition	Value	Evidence
	65MPa	From the standard
	65MPa	From the standard

HAZ ultimate strength fu,haz

Ultimate strength in the heat-affected zone of a weld (Eurocode 9).

Condition	Value	Evidence
	110MPa	From the standard
	110MPa	From the standard

Chemical composition

Show on the periodic table

EN AW-6060, % by mass (EN 573-3, per Hydro)

Element	Applies to	Max %	Evidence
Si	all thicknesses	0.60	Single source
Fe	all thicknesses	0.30	Single source
Cu	all thicknesses	0.10	Single source
Mn	all thicknesses	0.10	Single source
Mg	all thicknesses	0.60	Single source
Cr	all thicknesses	0.050	Single source
Zn	all thicknesses	0.15	Single source
Ti	all thicknesses	0.10	Single source

Sources here are public pages that reproduce EN 755-2. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence. Design factors are recommended values; your National Annex may set others.