Precision tubes machined to “ready to use” - type HP

“Ready to use” precision tubes (type HP) are used directly for production of the hydraulic cylinders. We offer a wide range of those tubes within the following parameters:

Dimensions of "ready to use" cylinder tubes


INNER DIAMETER (OD)	40.0 - 110.0 mm
WALL THICKNESS (WT)	4.0 - 10.0 mm



EN 10305-1; DIN 2391;	See tube sizes acc. to European standards

Tolerances of "ready to use" cylinder tubes

Tolerances of the outside diameter (OD) HP tubes meet the appropriate dimensional table standards DIN 2391-1, EN 10305-1. Tolerances values of the inside diameter (d) H8 a H9 are presented in the table. Tolerance of the wall thickness is -/+ 7.5% or 10% of the wall thickness.

Steel grades of "ready to use" tubes for cylinders


EN 10305-1 EN 10294-1	E355, 20MnV6, Marking system for steel grades according to EN

DIN 2391-2 DIN 17100	St 52 St 52-3

Chemical composition and mechanical properties of steels acc. to EN, DIN

Length of HP tubes


- manufactured length of precision tubes in the range of 3 to 6 meters - maximum precise length 6 meters
Straightness of "ready to use" HP tubes

Straightness of the tubes is 0,001 multiple of the tube length maximum, allowed straightness for one meter length is 1.0 milimeters.

Tubes ends


The ends are vertical to the longitudinal axis and are without burrs. Upon agreement the tubes may be capped with plastic caps.

ASK FOR QUOTE

Marking of tubes and tube bundles

The tubes are marked along the length of the tube where the following pieces of information are used: manufacturers’ logo, dimension (OD x ID), steel, heat number and the number of standard or other data as per the customers’ request. Bundles of tubes are marked with one or more labels with the required data

(a) tubes marked with labels

(b) tubes marked along the length

Packaging of tubes

Tube are supplied in packages with a circular or hexagonal outline with maximum weight of 2 000 kg

(a) tubes bound with a steel band and paper

Tube testing


Selection of the tests is either according to standards or upon agreement with customer:			cast / chemical analysis

			tensile test,

			dimensional inspecti

			visual inspection

			NDT to find longitudinal defects

eddy current (STN 01 5054, PRP 02-74, SEP 1925, ASTM E 309, EN 10246-3 Gr.E3), stray flux (STN 01 5047, ČSN 01 5047, SEP 1913, ASTM E 570, EN 10246-5 Gr.F3), ultrasound (STN 01 5028, ČSN 01 5028, SEP 1915, ASTM E 213, EN 10246-7 Gr.U3),

Certified test reports for HP tubes


EN 10204	3.1 specific testing,

DIN 50049	3.1.B,

Delivery condition of HP tubes

The tubes are delivered as cold drawn and annealed to relieve the stress BKS (+SR). Other delivery conditions are possible upon agreement. Marking for material condition according to DIN 2391-2 and ASTM 519 may be found here.