EN 573-3 Grade 3.1655 H13 – High-Performance Aluminum Alloy for Precision Machining

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	H13	EN 573-3, EN 1301
	2.83 g/cm³	H13	EN 573-3, EN 1301

Mechanical

Property	Value	Condition	Related Standards	Comment
Elastic modulus	70.0 GPa	H13	EN 573-3, EN 1301
	72.5 GPa	H13	EN 573-3, EN 1301
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	H13	EN 573-3, EN 1301
Tensile strength	155.0 - 225.0 MPa	H13	EN 573-3, EN 1301

Thermal

Property	Temperature	Value	Condition	Related Standards
Coefficient of thermal expansion	-50 °C	2.14e-05 1/K	H13	EN 573-3, EN 1301
	20 °C	2.14e-05 1/K	H13	EN 573-3, EN 1301
	20 °C	2.2899999999999998e-05 1/K	H13	EN 573-3, EN 1301
	20 °C	2.3399999999999996e-05 1/K	H13	EN 573-3, EN 1301
	20 °C	2.4e-05 1/K	H13	EN 573-3, EN 1301
	20 °C	2.4999999999999998e-05 1/K	H13	EN 573-3, EN 1301
	100 °C	2.2899999999999998e-05 1/K	H13	EN 573-3, EN 1301
	100 °C	2.3399999999999996e-05 1/K	H13	EN 573-3, EN 1301
	200 °C	2.4e-05 1/K	H13	EN 573-3, EN 1301
	300 °C	2.4999999999999998e-05 1/K	H13	EN 573-3, EN 1301
Melting point		540.0 - 645.0 °C	H13	EN 573-3, EN 1301
		585.0 - 650.0 °C	H13	EN 573-3, EN 1301
Specific heat capacity		864.0 J/(kg·K)	H13	EN 573-3, EN 1301
Thermal conductivity		151.0 - 172.0 W/(m·K)	H13	EN 573-3, EN 1301
		170.0 - 220.0 W/(m·K)	H13	EN 573-3, EN 1301

Electrical

Property	Value	Condition	Related Standards
Electrical conductivity	23000000.0 - 26000000.0 S/m	H13	EN 573-3, EN 1301
	24000000.0 - 32000000.0 S/m	H13	EN 573-3, EN 1301
Electrical resistivity	3.13e-08 - 4.17e-08 Ω·m	H13	EN 573-3, EN 1301
	3.85e-08 - 4.35e-08 Ω·m	H13	EN 573-3, EN 1301

Chemical properties

Property	Value	Condition	Related Standards
Bismuth	0.2 - 0.8 %	H13	EN 573-3, EN 1301
Copper	5.0 - 6.0 %	H13	EN 573-3, EN 1301
Iron	0.70 %	H13	EN 573-3, EN 1301
Lead	0.2 - 0.6 %	H13	EN 573-3, EN 1301
Silicon	0.4 %	H13	EN 573-3, EN 1301
Zinc	0.3 %	H13	EN 573-3, EN 1301

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 3.1355 O3 Aluminum Alloy – Aircraft‑Grade Strength & Machinability EN 573-3 Grade 3.1655 H18 Aluminum Alloy – Superior Machining & Mechanical Strength

Metal