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: 1.00 to 2.50 mm
- Precision strip thicknesses: 0.05 to 1.20 mm
- Strip widths: 3.00 to 600 mm
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
Surface coatings often resolve the conflict of interests between the technological requirements placed on the base material and the application conditions. A hot-dip tinned surface increases the reliability of connectors and stamping grids with respect to solderability and corrosion-resistance. At the same time, these reduce the contact resistance in electrical engineering applications.
The intermetallic phase generated during hot-dip tinning renders surfaces largely resistant to whisker formation, even without subsequent treatment. In addition, the thickness of the intermetallic phase can be defined by downstream heat treatment.
With hot-dip tinning, we provide a cost-efficient alternative to coating using precious or 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: