Precision tubes for hydraulic and pneumatic lines – HPL type

We offer a wide range of tubes for hydraulic and pneumatic circuit within the following parameters:

Dimensions of tubes for hydraulic and pneumatic lines

OUTER DIAMETER (OD)	6.0 - 80.0 mm
WALL THICKNESS (WT)	1.0 - 12.5 mm
EN 10305-4; DIN 2391; 2445-2 STN / ČSN 42 6711, 42 6712;	See tube sizes acc. to European standards
ASTM A 822	Tube sizes acc. to ASTM standard
JIS JOHS 102	Tube sizes acc. to JIS standard.

Tolerances of tubes for hydraulic and pneumatic lines

Tolerances of the precision tubes meet the appropriate dimensional table standards. Zeleziarne Podbrezova a.s. offers precision tubes with tighter tolerances, i.e. tolerances that are tighter compared with the standard values.

Reduced tolerances for metrical sizes - European standards.

Steel grades of tubes for hydraulic and pneumatic lines

EN 10305-4	E215; E235; E355 Marking system for steel grades according to EN
DIN 2391-2C DIN 1630	St 35 St 37.4; St 44.4; St 52.4
JIS JOHS 102	OST1; OST2; STPG370; STS370
ASTM A 822	A 822

Chemical composition and mechanical properties of steels acc. to EN, DIN, UNI, BS, NF-A, ASTM, JIS and other standards

Tubes surface protection

(a) oiled outer surface (b) phosphated outer surface (c) electrolytically galvanized and chrome-coated outer surface (d) galvanized and special outer surface

Steel micropurity

According to NFA 04 - 106 or ASTM E45 (JK ranking) max. A4-B2-C2-D2. Upon agreement it is also possible to assign according to EN 10247 or ISO 4967 (A – sulphides, B – alumina, C – silicates, D – oxides). Grain size meets the EN ISO 643 – 5 and finer.

Allowable pressure for hydraulic and pneumatic lines

The highest allowable pressure for hydraulic and pneumatic lines in relationship to steel and tube testing. Calculation was done according to DIN 2413.
Steel 37.4 (E235) without specific testing according to 3.1.B (3.1)
Steel 37.4 (E235) with specific testing according to 3.1.B (3.1)
Steel 52.4 (E355) without specific testing according to 3.1.B (3.1)
Steel 52.4 (E355) with specific testing according to 3.1.B (3.1)

Length of tubes for hydraulic and pneumatic lines

- manufactured length of the tubes is 6 000 mm (length tolerances 0 + 50 mm) - exact length is in the range of 3 000 - 9 000 mm (length tolerances 0 + 10 mm)

Tubes for hydraulic and pneumatic lines ends

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

 

 

Marking of tubes for hydraulic and pneumatic lines

Each tube is marked by the InkJet system along the whole length according to standards or according to customer requirements. Tube bundles are marked by tags.

Packaging of tubes for hydraulic and pneumatic lines

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

(b) tubes wrapped in plastic sheets, burlap,

(c) tubes in wooden crates.

Tubes for hydraulic and pneumatic line testing

Non specific or specifific testing.			flattening test or drift expanding test
			leak tightness test (NDT)
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),
Other tests according to standard.

Certified test reports of tubes for hydraulic lines

EN 10204	2.2 nonspecified testing (only mandatory tests),
	3.1 specific testing,
	3.2 after agreement .

Straightness of tubes for hydraulic and pneumatic lines

The allowable straightness for the whole length of the tube is 0.0015 multiple of the tube length, allowed straightness of one meter is 3 milimeters.

Delivery condition of tubes for hydraulic lines

Tubes are delivered as cold drawn and normalized NBK (acc. to DIN standard), +N (acc. to EN standard), N (acc. to ASTM standard). Overview of other conditions can be found here. Coarseness of the outer and inner surface (starting with 15 mm of the inside diameter) is Ra <= 4 micrometers (0.004mm).