Material Data sheet                                                                               Issue: October 2015

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Hard-rolled bronze strip, mat. no. 2.1020 (CuSn6)

1. Applications:

With zinc content of 6%, the bronze alloy CuSn6 is the most frequently used

type of bronze. Examples of typical applications are connectors, contact pins and general sheet metal parts and springs that require good electrical conductivity.

Unlike brass, bronze can also be used in vacuum technology.

Further applications:

pieces for electrical engineering and precision mechanics

Bronze is suitable for springs (see DIN EN 1654). At high demands on the mechanical strength or electrical conductivity we suggest Copper-Beryllium.

3.  Chemical composition: *

Cu:                                 balance

Zn:                                 max. 0.30%

Ni:                                  max. 0.30%

Pb:                                 max. 0.05%

Fe:                                 max. 0.10 %

Sn:                                 max. 5.5-7.0 %

P:                                   max. 0.35 %

* the exact composition of each batch can be documented by a material certificate

2.2 or 3.1 according to DIN EN 10 204.

4.  Delivery condition:

Condition:                     temper rolled, not hardenable

Surface:                        bright

Flatness:                       according to EN-Norms Ultimatetensile str.:           > 560 N/mm²

Further mechanical data: see chapter 7 and 8.

5.  Sizes:

Thicknesses:                0.05 – 0,30mm Standardsizes:         150 + 300-305mm

Edges:                           cut

Lenghts:                        individual lengths from 5 to 10 000mm or as coil

The following sizes are available from stock (without obligation), status: October 2015:

6.  Tolerances:

Thickness tolerance: +/- 10% at 0,05mm,

+/- 0,004mm at 0,10mm,

+/- 0,015 mm at 0,15-0,30mm Widthtolerance:      -0/+0.40mm

Straightness:                normal

Flatness:                       wave height max. 1mm

7.  Further mechanical data:

Yield str. Rp0,2 :         >530 N/mm² at R560 ElongationA 50:         >5% at R560

If good tumbling is done, the following values can be achieved: Reversed bending stress (Mean stress = 0):

The maximum value is approx. 30% of the tensile strength for brass if bending direction is at a 90° angle to the rolling direction

Fluctuating bending stress (Minimum stress = 0):

no data available, but the maximum value is lower than for the reversed bending stress.

As the fatigue strength depends on different factors like the corrosive conditions and the edge treatment, no definitive endurance limit values can be guaranteed.

At high forces or bending not in the right angle to the rolling direction the alloy CuBe2 is recommended (or hardened steels like 1.1274 or 1.4031Mo).

The maximum temperature depends on the load of the springs and is between 150 – 200 ° Celsius (see datasheet of the Deutsches Kupferinstitut).

8.  Physical properties

Density:                                 8.80 g/cm³

Thermal conductivity:          75 W/(m °C) depending on the temperature Spec. heatcapacity:  377 J/(kg °C) mean value at 50 – 100 °C Thermal expansion:        18.5 x 10 -6 (between 30 - 100 °C)

Electric conductivity:           9 mS/m (equivalent to 16% IACS)

Modus of elasticity:             118 000 MPa at 20 °C Relativepermeability µr:        bronze is not magnetisable