EN 573-3 Grade 3.1355 T651 – High-Strength Aluminum Alloy for Aerospace

Aluminum DIN 3.1355, known for its use in aircraft industry, is an alloy that offers excellent strength. When in the annealed condition it is readily formed and has good machinability. Though it has a relatively low level of corrosion resistance, it can be machined to a high finish.

Properties

General

Property	Value	Condition	Related Standards
Density	2.77 g/cm³	T651	EN 573-3, EN 754
	2.78 g/cm³	T651	EN 573-3, EN 754

Mechanical

Property	Value	Condition	Related Standards	Comment
Elastic modulus	73.0 GPa	T651	EN 573-3, EN 754
Plane-Strain Fracture Toughnes	22.0 - 35.0 MPa·√m			Typical for Wrought 2000 Series Aluminium
Poisson's ratio	0.33 [-]			Typical for Wrought 2000 Series Aluminium
Shear modulus	27.4 GPa	T651	EN 573-3, EN 754
Tensile strength	425.0 MPa	T651	EN 573-3, EN 754

Thermal

Property	Temperature	Value	Condition	Related Standards
Coefficient of thermal expansion	-50 °C	2.11e-05 1/K	T651	EN 573-3, EN 754
	20 °C	2.11e-05 1/K	T651	EN 573-3, EN 754
	20 °C	2.2899999999999998e-05 1/K	T651	EN 573-3, EN 754
	20 °C	2.3199999999999998e-05 1/K	T651	EN 573-3, EN 754
	20 °C	2.38e-05 1/K	T651	EN 573-3, EN 754
	20 °C	2.4699999999999997e-05 1/K	T651	EN 573-3, EN 754
	100 °C	2.2899999999999998e-05 1/K	T651	EN 573-3, EN 754
	100 °C	2.3199999999999998e-05 1/K	T651	EN 573-3, EN 754
	200 °C	2.38e-05 1/K	T651	EN 573-3, EN 754
	300 °C	2.4699999999999997e-05 1/K	T651	EN 573-3, EN 754
Melting point		505.0 - 640.0 °C	T651	EN 573-3, EN 754
		505.0 - 635.0 °C	T651	EN 573-3, EN 754
Specific heat capacity		875.0 J/(kg·K)	T651	EN 573-3, EN 754
Thermal conductivity		121.0 - 193.0 W/(m·K)	T651	EN 573-3, EN 754
		130.0 - 150.0 W/(m·K)	T651	EN 573-3, EN 754

Electrical

Property	Value	Condition	Related Standards
Electrical conductivity	17000000.0 - 29000000.0 S/m	T651	EN 573-3, EN 754
	18000000.0 - 21000000.0 S/m	T651	EN 573-3, EN 754
Electrical resistivity	3.45e-08 - 5.88e-08 Ω·m	T651	EN 573-3, EN 754
	4.76e-08 - 5.56e-08 Ω·m	T651	EN 573-3, EN 754

Chemical properties

Property	Value	Condition	Related Standards
Chromium	0.1 %	T651	EN 573-3, EN 754
Copper	3.8 - 4.9 %	T651	EN 573-3, EN 754
Iron	0.50 %	T651	EN 573-3, EN 754
Magnesium	1.2 - 1.8 %	T651	EN 573-3, EN 754
Manganese	0.3 - 0.9 %	T651	EN 573-3, EN 754
Silicon	0.5 %	T651	EN 573-3, EN 754
Titanium	0.15 %	T651	EN 573-3, EN 754
Zinc	0.25 %	T651	EN 573-3, EN 754

Technological properties

Property
Anodizing	decorative: not suitable, Protective: good
Brazing	hard brazing (with flux/ without flux): not suitable / not suitable, friction soldering: acceptable, soft brazing with flux: not suitable
Corrosion properties	Seawater: poor, weathering: poor
Workability	Bending / Spinning (cold): sufficient (O) / acceptable (O), Impact extrusion (cold): acceptable (O), Deep drawing / upsetting (Condition) acceptable (O) / sufficient (O)

EN 573-3 Grade 3.1355 T3511 Aluminum Alloy – High Strength for Aerospace Applications EN 573-3 Grade 3.1355 T8510 – Premium Aircraft‑Grade Aluminum Alloy

Metal