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Hydraulic Line Tubes (HPL)

Hydraulic Line Tubes (HPL) from Salzgitter Mannesmann Precision (SMP) are a high quality Seamless Cold Drawn precision tube predominantly for use as pressure lines in hydraulically or pneumatically operated equipment though they can also be used for a wide range of other applications.

Size Range:

  • Outside Diameter: 4mm to 80mm
  • Wall thickness: 0.75mm to 12.50mm
  • Technical standards: EN 10305-4 (Previously DIN 2391 and DIN 1630)
  • Tolerances: According to table HPL Tubes
  • Steel grades: E235 (ST37.4) and E355 (ST52.4)
  • Delivery condition: +N (NBK) Normalised
  • Design of wall thickness: DIN 2413-1 Load case I, II or III

Cold Workability:

The final heat treatment gives HPL tubing good cold workability such as bending & flaring. When bending is performed, the associated reduction in wall thickness on the outer bend and out of roundness on the inner bend must be taken into consideration.

Weldability:

The tubes are weldable without preheating and post-weld heat in accordance with current procedures.

Corrosion protection:

All tubes are provided with corrosion protection:

HPL Tubes Black

  • 2mm di <6mm: internal and external surface is lubricated
  • di >6mm : internal and external surface phosphatized and lubricated or only lubricated

HPL Tubes Galvanised - Cr 6 free high performance passivation

Externally galvanised tubes with a Zinc coating of 8 to 12 micron and subsequently passivated or chromated, plus temporary corrosion protection (inhibitor containing mineral), resistance against white corrosion.

Other details as standard:

  • In fix lengths as required
  • Ends square cut, un-worked, tubes with OD < 8 mm resp. ID <= 4 mm also ends square cut, un-worked and sealed with plugs or caps
  • ID <= 6 mm internal and external surface lubricated ( only for non-pinched off ends )
  • ID >= 6 mm internal and external surface phosphated and lubricated resp. only lubricated ( only for non-pinched off ends )
  • Tubes with inside diameter <= 4 mm sealed with plastic caps
  • Tubes with inside diameter < 4 mm sealed with plastic plugs
  • Eddy current tested acc. to DIN EN 10246, Part 3, class E3H
  • Marking: continuously marked along a line parallel to the tube axis with manufacturer, steel grade, dimension ( OD and wall ) and test code
  • Mill Test Certificate 3.1. acc. DIN EN 10204:2005
  • Packed in seaworthy fumigated wooden boxes
hydraulic line tubes (HPL)
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