DIN 1725-1: High-Strength Al‑Zn‑Mg‑Cu Alloy 3.4345 T5 – Optimal for Precision Applications

The alloy AlZnMgCu0,5 belongs to the aluminum materials, which achieve very high mechanical strength. With hot ageing the strength grade F 49 is attainable. This alloy is good splinter-giving machinably. The alloy is weldable with consideration of certain conditions, especially a heat influence zone with small strength appears there. One should not weld therefore if possible. A good corrosion resistance can be only guaranteed, if an appropriate protective surface layer is present. The corrosion resistance improves noticeably also by hot ageing. Roll-plating of sheet metals of this alloy e.g. with AlZn1 will support the small corrosion resistance with exhaust the high mechanical strenght fully. Thus the area of application extends noticeably. This alloy possesses well splinter-giving workability. Heat treatment for hardening: solution annealing: 470 to 480 °C, quenching in water hot ageing: 12 to 24 h at 115 to 125 °C, 4 to 6 h at 165 to 180 °C (two stage ageing) cold ageing is uncommon Application: In mechanical engineering for devices, tools. Predominantly tension-poor strained sheet metals for baseplates, head and stamp retaining plates as well as in the automobile engineering for safety-related parts and bumpers.

Properties

General

Property	Temperature	Value	Condition	Related Standards	Shape
Density	20.0 °C	2.78 g/cm³	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire

Mechanical

Property	Temperature	Value	Condition	Related Standards	Shape	Comment
Elastic modulus	20.0 °C	72.0 GPa	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Hardness, Brinell	20.0 °C	125.0 [-]	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Plane-Strain Fracture Toughnes		22.0 - 35.0 MPa·√m				Typical for Wrought 7000 Series Aluminium
Poisson's ratio		0.33 [-]				Typical for Wrought 7000 Series Aluminium
Shear modulus	20.0 °C	27.5 GPa	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Tensile strength	20.0 °C	460.0 MPa	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire

Thermal

Property	Temperature	Value	Condition	Related Standards	Shape	Comment
Coefficient of thermal expansion		2.1e-05 - 2.4e-05 1/K				Typical for Wrought 7000 Series Aluminium
Melting point		465.0 - 655.0 °C				Typical for Wrought 7000 Series Aluminium
Specific heat capacity		795.0 - 1050.0 J/(kg·K)				Typical for Wrought 7000 Series Aluminium
Thermal conductivity	20.0 °C	130.0 - 160.0 W/(m·K)	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire

Electrical

Property	Temperature	Value	Condition	Related Standards	Shape	Comment
Electrical conductivity	20.0 °C	19000000.0 - 23000000.0 S/m	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Electrical resistivity		2.9e-08 - 5.6e-08 Ω·m				Typical for Wrought 7000 Series Aluminium

Chemical properties

Property	Value	Condition	Related Standards	Shape
Chromium	0.1 - 0.3 %	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Copper	0.5 - 1.0 %	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Iron	0.5	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Magnesium	2.6 - 3.7 %	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Manganese	0.1 - 0.4 %	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Silicon	0.5	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire
Zinc	4.3 - 5.2 %	T5	DIN 1725-1, EN 573-3, EN 573-4	Wire

Technological properties

Property
Brazing	Excellent

Property

Brazing

Excellent

DIN 1725-1 Grade 3.4345 H14 – High-Strength AlZnMgCu0.5 Alloy Specifications DIN 1725-1 Grade 3.4345 T8 – High Strength AlZnMgCu0.5 Alloy

Metal