Technical Informationen - cold-rolled Bronze Foils & Bronze Strips CW452K CuSn6

Basic information and applications CW452K CuSn6

The bronze alloy CW452K with approx. 6% tin content is the most common type of bronze.

Typical application examples are connectors, contact pins as well as general stamped and bent parts and springs where good electrical conductivity is important.

In contrast to brass, bronze can also be used in vacuum technology.

The material CuSn6 is approved as a spring material (see DIN 1654).

Copper beryllium should be used for high demands on mechanical stress or electrical conductivity.

Delivery condition

Structure: cold rolled, not hardenable

Surface: bright

Tensile strength:> 560 N / mm²

Tolerances

Thickness tolerance: +/- 10% at 0.05mm; +/- 0.004mm at 0.10mm; +/- 0.015mm at 0.15-0.30mm

Width tolerance: -0 / + 0.40mm (not for cuts)

Straightness: normal

Flatness: wave height max. 1.0 mm

Mechanical details

Elongation limit Rp0.2:> 450N/mm² with R560

Elongation A80: >8% with R560

Hardness: 160-190 HV at R500

With good edge processing after cutting (e.g. by surface grinding) the following values can be achieved:

Alternating bending stress (medium stress = 0): The alternating bending strength is defined as the maximum bending stress amplitude at which a material can withstand 10 ^ 7 load cycles under symmetrical alternating loading without breaking. It depends on the tested strength condition and is about 30% of the tensile strength Rm.

Tension threshold tension (minimum stress = 0): With higher tensile strengths, the yield strength increases and the elongation decreases.

Since the fatigue strength depends on various factors such as the ambient conditions and the nature of the edges, no values can be guaranteed.

In the case of heavy loads or bending that are not perpendicular to the rolling direction, the use of copper beryllium is required.

The highest application temperature is between 150 and 200 ° C depending on the stress on the springs (see information sheet of the German Copper Institute).

Alloy Designations

German Norm:	2.1020
EN:	CuSn6
UNS:	C 51900
Engl. Norm:	CW452K
AFNOR:	CuSN6P
Japan. Norm:	JIS C5191

Material - Composition *

Cu:	Rest
Fe:	<0,1 %
Pb:	<0,05 %
Ni:	<0,3 %
P:	<0,35 %
Sn:	5,5 - 7,0 %
Zn:	<0,3 %

* for the exact composition can be documented in the form of a test certificate 2.2 or 3.1 (according to DIN 10 204) for each batch.

Physical Information

Density:	8,8 g/cm³
Heat conduction:	75 W/(m °C) in Abhängigkeit von der Temperatur
Heat capacity:	0,377 J/(Kg °C) mittlere Werte bei 50 - 100 °C
Thermal expansion:	18,5x10 -6 (zwischen 30 - 100 °C)
Electric conductivity:	9 mS/m (entspricht 16% IACS)
Modulus of elasticity:	118 000 MPa bei 20°C
Relative permeability µr:	1,00 (unmagnetisierbar)

Processing information CW452K CuSn6

Punching: The cutting gap should correspond to approximately 10% of the strip thickness. The corner radii should be at least 0.25 and the punch diameter min. be twice the tape thickness. For stamped parts, post-treatment by slide grinding is necessary to achieve good fatigue strength.

Laser cutting: This material can be easily laser cut.

Etching: The material is very easy to etch.

Bending: Since the high strength of the material is achieved through cold forming during rolling, the rolling direction has a major influence on bending.

Bending transversely (perpendicular) to the rolling direction:

	R500	R560	R640	R720
to 0,5 mm	0,5 x t	1 x t	1 x t	2 x t

t = thickness

Bending lengthways (parallel) to the rolling direction:

	R500	R560	R640	R720
to 0,5 mm	0,5 x t	1 x t	4 x t	9 x t

t = thickness

The recommended minimum bending radius also depends on the tensile strength.

Surface grinding and polishing: Since bronze cannot be magnetized, it cannot be clamped on magnetic chucks of grinding machines. Bronze is easy to polish.

Welding and soldering: The material can be easily welded using all methods. However, the heat input at the weld seam can lead to a structural change that reduces the strength. Bronze is very suitable for soft soldering.

Chemical resistance CW452K CuSn6

Resistant to sea water and industrial atmosphere. Largely insensitive to stress corrosion cracking.

Important NOTE

The technical information listed above or the information provided on the nature or use of the materials serve for description and are not a guarantee of properties. The information with which we want to advise you corresponds to our experience and that of our upstream suppliers. We cannot guarantee the results of processing and application. (03/2024)

thickness 0,05 - 0,3mm

width 150mm

Bronze Foils CW452K 150 x 500 mm - (5 pc./PU)

Bronze Foil - Bronze Sheet Bronze is an alloy of copper (Cu) and tin (Sn). A distinction is made between wrought and cast alloys depending on the processing. Typical application examples are connectors, contact pins, as well as general stamped and bent parts and springs, where good electrical conductivity is necessary In contrast to brass, bronze can also be used in vacuum technology. Properties material CW452K - 2.1020 The bronze alloy CW452K - also called two-alloy - is the most frequently used type of bronze with a tin content of approx. 6%. The alloy CW452K is characterized by a particularly favorable combination of cold formability, strength and hardness. In addition, bronze is very corrosion and wear-resistant as well as seawater-resistant and has good tinnability. Technical information Bronze cannot be magnetized and therefore cannot be clamped on grinding machines. Bronze plates can be laser cut well and are very easy to etch. CuSn6 is easy to weld with all processes. However, the heat input at the weld seam can lead to a structural change that reduces the strength. Bronze is very suitable for soft soldering. The high strength of the bronze plates or the material is achieved by cold forming during rolling. Therefore, the direction of rolling has a great influence on bending. Other applications / properties:

Content: 0.375 m² (€132.40 / 1 m²)

From €39.88

Details

thickness 0,05 - 0,3mm

width 150mm