In the area of strip products, we not only offer standardized off-the-shelf solutions but also the possibility to individually adapt our products and their properties to specific customer requirements. In order to do so, we need to optimize cold forming strain and subsequent annealing parameters, depending on chemical composition.
The following copper-based alloys are available for strip:
- Nickel silver
- Special and high-performance alloys
- Coin alloys
We offer special alloys which, due to their special properties, may be put to optimum use in various application areas.
Our strip for connectors fulfil the high requirements with respect to thermal stability and the spring bending limit. At the same time, sufficient conductivity is ensured.
For the area of electrical engineering, we supply strip with medium to high conductivity, depending on requirements. The requirements relating to temperature resilience and mechanical properties are usually not relevant here.
Our strip for leadframe applications fulfil the stringent requirements regarding electrical and thermal conductivity.
Roll-cladded materials are frequently used in connectors, electrical contacts, bi-metals and coins. Here, we offer composite materials which consist of a base material of low metal value and a functional material as a coating.
For cups we offer strip which demonstrates good deep-drawing properties and a low texture in the later product. Our strip for coins and medals is highly suitable for stamping, milling, embossing and polishing.
Note: The deep-drawing properties and texture are required to generate the product. These properties do not have any influence on the later product.
Depending on the desired alloy, strip thicknesses are possible which may be up to 50µm thin.
- Bright pre-rolled strip 1.0–5.0 mm
- Precision strip thicknesses 0.05–1.2 mm
- Strip widths 3.0–600 mm, but at least 10 x strip thickness
Larger strip widths upon request.
The form of delivery for our products is aligned to the technical facilities of our customers. There are three basic versions available. These are adapted to the existing facilities of our customers.
For the broad portfolio in the area of flat products, we not only offer different physical and technological characteristics of the base material but also hot-dip tinned and electroplated surfaces. In the case of hot-dip tinned surfaces, coating thickness ranges of between 1.0 and 13 µm are available. For electroplated surfaces, the coating thickness is limited to a maximum of 4 µm. Besides the standard tin coating, other coatings are available upon request. These include nickel, silver, gold or combinations thereof.
- Hot-dip tinning
In a large number of technical applications, the coating of surfaces becomes a crucial element when metallic materials are used. This applies in particular to the coating of copper-based materials with tin. In addition to corrosion protection, tin plating is used for secure contacting of plug connections and improved solderability.
Hot-dip tinned surfaces form intermetallic phases inherent in the system and are therefore largely resistant - even without post-treatment - to the occurrence of whisker effects, which can lead to possible failure of electrical components.
Depending on the further processing and use of tin-coated strip, the thickness of the intermetallic phase can be precisely adjusted by means of heat treatment. The insertion and withdrawal forces as well as the surface hardness and solderability are influenced accordingly.
Hot-dip tinning is a cost-effective alternative to coating with precious and semi-precious metal.
Besides hot-dip tinning, Diehl Metal Applications also offers a broad range of electroplated coating technologies for various requirements.
These are used in applications where narrow coating thickness tolerances or a combination of different coatings are required. Strip that has been coated with tin or nickel demonstrates a full-surface and even coating layer. This can be given a matte or glossy finish. Tin plating is particularly suitable for heat-sensitive materials, as the coating process does not generate any thermal load on the base material.
With three roll stands, we not only have a high rolling capacity but also the ability to ensure minimum rolling tolerances as part of the Sundwiger fine tolerance. By using two 20-roll stands, we can offer even the thinnest material thicknesses with minimum tolerances.
Individual production steps: