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Precision tubes for hydraulic and pneumatic cylinders

Features that precision steel pipes used for hydraulic cylinders should have:

  • high dimensional accuracy – pipes should have very accurate dimensions to ensure precise matching to other elements of the hydraulic cylinder;
  • high surface quality – the inner and outer surface of the pipes should be very smooth, without burrs, scratches and other damage, which affects the tribological properties of the cylinder (referring to friction forces);
  • high tensile and bending strength, which affects the durability and stability of the hydraulic cylinder;
  • high resistance to fatigue – pipes should have a very good resistance to cyclical loads, which is especially important in the case of hydraulic cylinders operating in dynamic conditions;
  • high corrosion resistance – to ensure a long life of the hydraulic cylinder in harsh environmental conditions;
  • exact chemical parameters;
  • high pressure resistance – pipes should withstand the high pressures that prevail in hydraulic cylinders to ensure the safety and reliability of these devices.
Calculate the weight of pipes

Calculate the weight of pipes

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Standards

EN 10305-1 Steel tubes for precision applications. Part 1: Seamless cold drawn tubes.
DIN 2391 Seamless precision steel tubes. Part 1: Dimensions. Part 2: TDC.

HPZ type – precision tubes for mechanical treatment
HP type – precision hydraulic tubes “ready to use”

Steel grades

E355 according to EN 10305-1, St52 according to DIN 2391, St52-3 according to DIN 17100, 20 MnV6 according to EN 10294-1

Lengths

  •  random lengths 3 m-6 m (HPZ type), 2 m-6 m (HP type)
  •  fixed lengths max 6 m

Straightness

1 mm / 1000 mm – measured on the outside surface.

Tube ends

Plain, on request ends can be plugged with plastic caps.

Delivery condition

+SR (EN); BKS (DIN) – cold finished / stress relieve annealed
Other conditions upon agreement (+N / NBK, +C / BK)

Testing

– cast analysis
– tensile test
– visual test
– dimensional test
– NDT (eddy current test)
– other test upon agreement

Marking

Colour stencilling along whole tube length:
– producer’s logo
– size (inside diameter x wall whickness)
– steel
– heat no.
– standard no. (or according to customer’s specification)

Surface protection

Tubes are oiled.

Packing

Tubes are packed in round or hexagonal bundles with weight max 2 000 kg, fastened with steel strips.

Certificates

According to EN 10204 3.1

Dimensions, tolerances and weight of HPZ tubes

Dimensions, tolerances and weight of HP tubes