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K65 Tube for CO2 Applications

Tubes

Product Information

In refrigeration, and in particular in the area of supermarket refrigeration systems, more and more ecology-oriented plant concepts are being implemented.
The modern, environment-friendly refrigerant CO2 that is used here leads to high operating pressures. For these applications the new K65 tube system is available.
Tubes and fittings are made of the high-strength copper alloy K65 which has already been used with success in electrical engineering and the automotive industry.
K65 allows economical installation of refrigeration systems with operating pressures up to 120 bar.
K65 has good processing properties which are similar to those of copper.
K65 tubes may be brazed to K65 fittings in the traditional way.
K65 fittings are manufactured by IBP Conex. Safety ensured by two well-known manufacturers, K65 tubes and K65 fittings fall under a joint system guarantee that includes CO2 applications up to 120 bar for the items listed.

Easy to identify – even after installation

K65 tubes and fittings are marked appropriately, so that the system components can be clearly identified at all times.
The material is slightly magnetic and can easily be distinguished from copper by means of a neodymium magnet – a helpful, practical advantage.

Economical

The main advantage is the mechanical strength of K65. Because of the high strength of the material, the K65 product can be made with comparatively thinner walls. The light weight of tubes made of K65 means not only a saving in material, but also easier handling, for example when mounting the tubes on ceilings.

Instructions for Use

How to Braze Copper Fittings Instructions

Downloads

K65 Data Sheet

Lawton K65 is a high copper alloy with high mechanical strength.

Typical Applications

Tubes for air conditioning and refrigeration, heating and solar engineering, brake line tubing

Temper (DIN EN12449)

R300** soft annealed R420** hard

According to DIN EN 12449

Chemical Composition		Mechanical properties (annealed)
Fe	2.10-2.60 %	Rn	min.>300 N/mm2
Zn	0.05-0.20%	Rn	max.>250 N/mm2
P	0.015-0.15 %	A	min. >25%
Pb	max. 0.03 %
Cu	balance

**Conformity to PED 97/23/EC can be certified through product inspection by a technical inspection agency such as TUV.

Fabrication properties
Cold working	excellent
Electroplating	excellent
Hot-dip tinning	excellent
Machinability	poor

Joining
Brazing	excellent
Soft soldering	excellent
Inert gas shielded
arc welding	excellent
Resistance
welding	good
Laser welding	good

Corrosion resistance

Lawton K65 is insensitive to stress corrosion cracking. Lawton K65 exhibits good resistance in natural atmosphere (also marine atmosphere) and industrial atmosphere. It has a better resistance to erosion and pitting corrosion than Cu-DHP in different types of water and neutral saline solutions.

Sizes available
Type of delivery		Outside diameter mm*	Manufacture	Temper
Straight lengths	plain	7-108	seamless	hard or annealed
(max. 7800 mm)	inner-grooved	7-16	seamless	hard or annealed
Level-wound coils (LWC)	plain	7-20	seamless	hard or annealed
(coil weight on request)	inner-grooved	7-16	seamless	hard or annealed

*Wall thicknesses and other sizes on request

Relevant standards and specifications

DIN EN 12449 Seamless, round tubes for general purposes

Wieland R-1084 Seamless drawn plain or inner-grooved tubes in K65 in LWC for pressure vesels and piping

Wieland R-1085 Seamless drawn plain or inner-grooved copper tubes in K65 in straight lengths for pressure vessels and piping

VdTUV-Werkstoffblatt, new draft 03.2010 Seamless drawn tubes in CuFe2P (CW107C) Wieland K65