Copper strip rolling mills - Import export

State-of-the-art technology and extensive knowledge in the processing of steel characterise our location in Bad Salzungen, Germany. For us, performance means a wide range of cold-rolled steels of the highest quality at competitive prices, flexibility and a high degree of readiness to deliver while adhering precisely to the specified chemical and mechanical values. Surface finishing by electrolytic galvanizing and/or subsequent customisation of your goods are possible for us. We offer all our customers spooled materials with volumes of over 200,000 metres of metal strip per spool. This further development means a considerable advantage for our customers. Personnel-intensive set-up times and machine downtimes are avoided.

Constantan® is a copper-nickel alloy that contains specific minor amounts of additional elements to achieve precise values for the temperature coefficient of resistivity. Careful control of melting and conversion practices results in a very low level of pinholes at ultra-thin thicknesses. The alloy is used extensively for foil resistors and strain gauges. The TCR can be adjusted from the furnished cold rolled values by using a low temperature heat treatment to achieve compensation for all types of spring elements. The foil is normally supplied with 90% cold reduction and a smooth bright surface. The foil is reasonably flat at 4” wide and nearly free of pinholes. The cold rolled foil can be produced with a TCR between +10 to –35 PPM/°C. The heat treatment will shift the foil TCR to the desired value. A typical heat-treat curve for Constantan® shows decreasing resistivity but increasing TCR with increased heat-treating temperature.