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DIN 1725-1 Grade 3.1305 T4 – High‑Strength Al‑Cu‑Mg Alloy

The alloy AlCu2,5Mg0,5 (see also AlCu2,5Mg0,5, material number 3.1124, Werkstoffleistungsblätter der Deutschen Luftfahrt WL 3.1124, part of 1 and part of 100, Ausgn. 12.87) belongs to the type of alloy Al-Cu-Mg, which found of the aluminum wrought machine materials as first in the technology use. Alloys of this type are cold and hot hardenable, reach thereby high mechanical strength and are relatively heat resistant even in the soft condition. In the cold-hardened condition this alloy reaches strength grades to maximally F 31 and lies lowest from the standardised AlCuMg materials. It is not in practice usual for reasons of the corrosion resistance worsening in the warm-hardened material condition. Even in the cold-hardened condition a surface protection is necessary. It is disadvantageous, that even the smallest mistake in heat treatment results in decreasing of strength as well as the bad ability for hot forming and difficult weldability of this alloy. Its particularly good splinter-giving workability is remarkable, whereby screws and rivets are suitable for joining elements. The alloy AlCu2,5Mg0,5 is only as wire in DIN 1790 part of 1 and part of 2 standardised, because there it is exclusively used as rivet material (DIN 59,675). Heat treatment for hardening: solution annealing: 475 to 505 °C, quenching in water cold ageing: 5 to 8 d at ambient temperature hot ageing: 16 to 24 h at 180 to 195 °C Application: Solid rivets

Properties

General

PropertyTemperatureValueConditionRelated StandardsShape

Density

2.75 g/cm³

T4

EN 573-3, EN 1301

20.0 °C

2.74 g/cm³

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

20.0 °C

2.75 g/cm³

T4

WL 3.1124-1, DIN 1725-1

Wire

Mechanical

PropertyTemperatureValueConditionRelated StandardsShapeComment

Elastic modulus

70.0 GPa

T4

EN 573-3, EN 1301

20.0 °C

67.0 GPa

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

20.0 °C

71.1 GPa

T4

WL 3.1124-1, DIN 1725-1

Wire

Elongation

20.0 %

T4

EN 573-3, EN 1301

20.0 °C

5.0 %

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

A100

20.0 °C

10.0 %

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

A10

Hardness, Brinell

20.0 °C

75.0 [-]

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

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

20.0 °C

25.5 GPa

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

Shear strength

20.0 °C

195.0 MPa

T4

WL 3.1124-1, DIN 1725-1

Wire

Tensile strength

260.0 MPa

T4

EN 573-3, EN 1301

20.0 °C

270.0 MPa

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

Thermal

PropertyTemperatureValueConditionRelated StandardsShape

Coefficient of thermal expansion

-50.0 °C

2.18e-05 1/K

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

20 °C

2.38e-05 1/K

T4

EN 573-3, EN 1301

100.0 °C

2.34e-05 1/K

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

100 °C

2.38e-05 1/K

T4

EN 573-3, EN 1301

200.0 °C

2.45e-05 1/K

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

300.0 °C

2.56e-05 1/K

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

Melting point

550.0 - 650.0 °C

T4

EN 573-3, EN 1301

Specific heat capacity

20.0 °C

898.0 J/(kg·K)

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

20.0 °C

920.0 J/(kg·K)

T4

WL 3.1124-1, DIN 1725-1

Wire

Thermal conductivity

155 W/(m·K)

T4

EN 573-3, EN 1301

20.0 °C

150.0 - 180.0 W/(m·K)

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

Electrical

PropertyTemperatureValueConditionRelated StandardsShape

Electrical conductivity

23000000.0 S/m

T4

EN 573-3, EN 1301

20.0 °C

21000000.0 - 25000000.0 S/m

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

Electrical resistivity

4.35e-08 Ω·m

T4

EN 573-3, EN 1301

Chemical properties

PropertyValueConditionRelated StandardsShape

Chromium

0.1 %

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1, EN 1301

Wire

Copper

2.2 - 3.0 %

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1, EN 1301

Wire

Iron

0.7 %

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1

Wire

0.70 %

T4

EN 573-3, EN 1301

Magnesium

0.2 - 0.5 %

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1, EN 1301

Wire

Manganese

0.2 %

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1, EN 1301

Wire

Silicon

0.8 %

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1, EN 1301

Wire

Zinc

0.25 %

T4

DIN 1725-1, EN 573-3, EN 573-4, WL 3.1124-1, EN 1301

Wire

Technological properties

Property
Workability

Moderate Workability


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