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  Tubing guide
Seamless precision steel tube St 37.4
We recommend the use of seamless precision steel tubes with dimensions to DIN 2391, part 1, material St 37.4 to DIN 1630, type NBK. The following tube wall thickness are suitable for use:

.Reinforce tube inserts are recommended where thinwalled tubes are subject to severe strains.
* Permissible variation in wall thickness (DIN 2391)
Note. For a diameter ratio of O.D/I.D > 1.35, calculation made to DIN 2413 part III and based on a pulsating fatigue limit of 235 N/mm2
Temperature range : -40°C to +120°C without reduction in pressure.
 
Seamless precision stainless steel 1.4571
Stainless steel tubes (e.g. 1.4571), code X6CrNiMoTi 171 22, must be cold-drawn and seamless, heat - treated without formation of scales, type m to Din 17458, provide tolerances to DIN 2391, Part 1. The following tube wall thickness are suitable for use :

- Reinforced tube inserts are recommended where thinwalled tubes are subject to severe strains.
* Permissible variation in wall thickness (DIN 2391)
 
Note. For a diameter ratio of O.D/I.D > 1.35, calculation made to DIN 2413 part III and based on a pulsating fatigue limit of 225 N/mm2
Temperature range : -60°C to +400°C
Reduction in pressure for higher temperatures.