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Hydraulic tubes
 
Uniform for all pressure levels we utilise stainless steel (St 37.4) according to DIN 1630. The tubes are available either zinc-plated or phosphated and lubricated.
 
Every tube has to undergo a material inspection as well as an eddy-current testing. The delivery condition is NBK standard bright-annealed. After the last cold forming procedure the tubes are annealed (above top critical point) under shielding gas.
 
All tubes exceeding 6 m of length (ca. 17 feet) are designated according to standard in order to prove leakproof sealing and to substitute a factory certification according to EN 10204 (previously DIN 50049) before delivery.
 
If desired a certification of goods 3.1B according to EN 10204 can be issued. The certificates always relate to the grade and can not be issued retrospectively. It is necessary to make the request for the 3.1B certificate when placing the purchase order. The HANSA-FLEX product range also includes stainless steel tubes with the material designations 1.4571 as well as 1.4541.
 
HANSA-FLEX hydraulic tubes are seamless precision steel tubes according to DIN 2391, grade C, seamless cold drawn version.