Our high-pressure tubes are made of cold-worked stainless steel. When annealed, the material is relatively soft. 1.4571 has a yield strength of only 220N/mm². By cold drawing, this yield strength is increased to 700 to 800 N/mm². In some newer materials even to 1200 N/mm².
To maintain this condition, the tubes must not be heated above 700°C. Therefore, the tubes must not be welded or bent warm. Although there are relatively few with bending a tube, the bend radius should be at least six times the tube diameter.
We have had our high-pressure tubes manufactured to strict specifications. These essentially cover the following groups:
- Mechanical material properties
- Interior and exterior surface quality
- Chemical material properties
- Mechanical material testing
The test pressure beyond the operating pressure should be chosen after consultation according to the conditions of use, since in most cases already a – sometimes desirable – material consolidation takes place. For some applications – e.g. with strong pressure fluctuations – it makes sense to autofrettage the tubes. We will gladly provide you with further information on request. We can also supply tubes made of other materials.
We supply high pressure connections for 60° and for 120° cones. The 60° cones are a worldwide standard. The 120° cones are relatively new. They have the following advantages:
- They seal better, especially at higher pressures.
- The cone is shorter and more stable.
- The tendency of the 60° cone to crack due to the wedge effect of the more acute angle is replaced by a stabilizing effect.
- The production is easier. The amount of material that needs to be cut is reduced up to 77% compared to a 60° cone.
- A single cone cutting knife can be used for all tube diameters.
To make a screw connection, a tube must be provided with a cone and a thread. With a tube bending tool the tube can be bent into the desired shape. Damaged cones can be reworked by means of a cone finishing tool. For details about the tools, see section Accessories.
The tube is provided with a pressure ring and a pressure screw and can then be screwed without rotation into the counterpart. If stronger vibrations or pressure surges occur, a Vibro fitting should be used. For details about the Vibro-screw-connection see section Screwed connections.
Our tube assortment includes:
- Pressures up to 14,000 bars
- Nominal diameter from 0.6mm to 23.8mm
- Tubes in lengths of 4-7 m, shorter pieces on request