EN 573-3 Grade 3.1655 O3 Aluminum Alloy – Characteristics & Applications

Aluminum DIN 3.1655 is a popular age-hardenable alloy known for its free-machining characteristics and mechanical properties. It can be machined to very close tolerances while still maintaining a smooth and bright finish. Unlike other aluminum alloys, DIN 3.1655 does not offer good corrosion resistance or weldability.

Properties

General

Property	Value	Condition	Related Standards
Density	2.82 g/cm³	O3	EN 573-3, EN 1715-3
	2.83 g/cm³	O3	EN 573-3, EN 1715-3

Mechanical

Property	Value	Condition	Related Standards	Comment
Elastic modulus	70.0 GPa	O3	EN 573-3, EN 1715-3
	72.5 GPa	O3	EN 573-3, EN 1715-3
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	27.3 GPa	O3	EN 573-3, EN 1715-3
Tensile strength	110.0 - 170.0 MPa	O3	EN 573-3, EN 1715-3

Thermal

Property	Temperature	Value	Condition	Related Standards
Coefficient of thermal expansion	-50 °C	2.14e-05 1/K	O3	EN 573-3, EN 1715-3
	20 °C	2.14e-05 1/K	O3	EN 573-3, EN 1715-3
	20 °C	2.2899999999999998e-05 1/K	O3	EN 573-3, EN 1715-3
	20 °C	2.3399999999999996e-05 1/K	O3	EN 573-3, EN 1715-3
	20 °C	2.4e-05 1/K	O3	EN 573-3, EN 1715-3
	20 °C	2.4999999999999998e-05 1/K	O3	EN 573-3, EN 1715-3
	100 °C	2.2899999999999998e-05 1/K	O3	EN 573-3, EN 1715-3
	100 °C	2.3399999999999996e-05 1/K	O3	EN 573-3, EN 1715-3
	200 °C	2.4e-05 1/K	O3	EN 573-3, EN 1715-3
	300 °C	2.4999999999999998e-05 1/K	O3	EN 573-3, EN 1715-3
Melting point		540.0 - 645.0 °C	O3	EN 573-3, EN 1715-3
		585.0 - 650.0 °C	O3	EN 573-3, EN 1715-3
Specific heat capacity		864.0 J/(kg·K)	O3	EN 573-3, EN 1715-3
Thermal conductivity		151.0 - 172.0 W/(m·K)	O3	EN 573-3, EN 1715-3
		170.0 - 220.0 W/(m·K)	O3	EN 573-3, EN 1715-3

Electrical

Property	Value	Condition	Related Standards
Electrical conductivity	23000000.0 - 26000000.0 S/m	O3	EN 573-3, EN 1715-3
	24000000.0 - 32000000.0 S/m	O3	EN 573-3, EN 1715-3
Electrical resistivity	3.13e-08 - 4.17e-08 Ω·m	O3	EN 573-3, EN 1715-3
	3.85e-08 - 4.35e-08 Ω·m	O3	EN 573-3, EN 1715-3

Chemical properties

Property	Value	Condition	Related Standards
Bismuth	0.2 - 0.8 %	O3	EN 573-3, EN 1715-3
Copper	5.0 - 6.0 %	O3	EN 573-3, EN 1715-3
Iron	0.70 %	O3	EN 573-3, EN 1715-3
Lead	0.2 - 0.6 %	O3	EN 573-3, EN 1715-3
Silicon	0.4 %	O3	EN 573-3, EN 1715-3
Zinc	0.3 %	O3	EN 573-3, EN 1715-3

Technological properties

Property
Anodizing	decorative: not suitable, Protective: poor
Brazing	hard brazing (with flux/ without flux): not suitable /, friction soldering: sufficient
Corrosion properties	Seawater: poor, weathering: sufficient
Workability	Deep drawing / upsetting (Condition) - / acceptable

EN 573-3 Grade 3.1655 H18 Aluminum Alloy – Superior Machining & Mechanical Strength WL 3.1754 T6 Alloy – Premium Material for Gearboxes & Air Inlet Systems

Metal