Wieland-K65 is a high-strength copper alloy with a considerably higher thermal conductivity than that of stainless steel or aluminium. This alloy is particularly suitable for heat-exchanger tubes and has good processing properties. K65 tubes have been developed in line with the trend towards natural refrigerants CO₂ and the resulting higher pressures.

April 2012 Umicore BraceTec confirms solderability of K65

Jan 2012 Now fittings available

Mar 2011 Characteristics: Light, pressure- and high-temperature resistant

Now fittings available

In addition to the tubes in K65 that can already be delivered in series, fittings made of this high-strength material are now also available. Already at the ISH in Frankfurt the cooperation with our partner, Conex | Bänninger, has been presented.

The fitting components have been developed for applications with operating pressures up to 120 bar.
K65 is, therefore,
particularly suitable for use as high-pressure piping systems for the natural refrigerant CO₂. Application examples are refrigeration systems in supermarkets or heat pumps.

So, K65 is now available as "system solution".
The sizes available as well as individual components can be found in the attached brochure (PDF, 0.4 MB) .

In case of questions regarding the system, please do not hesitate to contact us.

Light, pressure- and high-temperature resistant

With these characteristics our all-rounder Wieland-K65 follows the trend towards natural refrigerants and with its low weight it counteracts the ever rising copper prices. In addition, K65 has very good processing properties.

High strength alloy
K65 - CuFe2P according to EN12449 - is a high-strength copper alloy with approximately 2 % iron. Known for many years in the automotive and electrical industries, it is now also being used in air conditioning and refrigeration. This alloy is characterised by very high thermal conductivity (factor 20 compared to stainless steel or factor 2 compared to aluminium). It is, therefore, particularly suitable as heat exchanger tube. Especially in the field of heat pumps and industrial refrigeration units there is great potential for K65. The good processing properties of K65 are similar to those of Cu-DHP. The corrosion resistance of K65 is equivalent to that of high purity copper. This makes K65 the first choice for connecting tubes.

Light means low priced
The main advantage of K65, however, lies in its mechanical strength: depending on the dimension and pressure, a reduction in wall thickness and consequently weight per metre by up to 40 % is possible compared to Cu-DHP. For example, in the case of a 3/8“ tube in CO2 refrigeration units with supercritical operation this means a reduction in wall thickness from 1.12 mm for copper to approx. 0.64 mm for K65. This significantly reduces material input on the one hand, and on the other saves money.

Your benefits of using K65 at a glance:

• cost reduction through weight reduction
• very good heat transfer
• common processing technologies
• existing processing equipment can be used
• TÜV certified

Please contact us!

Information for downloading: The tube system for high-pressure applications (PDF, 0.4 MB)