Steel grades of tubes for hydraulic and pneumatic lines
| EN 10305-4 | E215, E235, E355 |
| EN 10 294-2C | St35 |
| STN 42 0260 | 11 353, 11 523 |
| DIN 1630 | St37.4, St44.4, St52.4 |
| ASTM A 822 | A 822 |
Tubes for hydraulic and pneumatic lines – HPL type
Tubes designated for hydraulic and pneumatic pressure distribution – type HPL are seamless cold drawn steel tubes that are used in pressure distributions and circuits, in hydraulically and pneumatically operated equipment.
The speed and pressure of the medium are significantly changing and these devices have characteristic pressure surges on the inner surface of tubes.
Dimensions of tubes for hydraulic and pneumatic lines
| OUTER DIAMETER (OD) | 6,0 – 80,0 mm |
| WALL THICKNESS (WT) | 1,0 – 12,5 mm |
| EUROPEAN STANDARDS | EN 10305-4, DIN 2391-1, BS 7416, NF a 49-330, STN/ČSN 42 6711, STN/ČSN 42 6712 |
| JAPANESE STANDARDS | JIS JOHS 102 |
| AMERICAN STANDARDS | ASTM A 822 |
Length of tubes for hydraulic and pneumatic lines
(a), manufactured length of the tubes is 6 000 mm (length tolerances 0 + 50 mm)
(b), exact length is in the range of 3 000 – 9 000 mm (length tolerances 0 + 10 mm)
Tubes for hydraulic and pneumatic line testing
Non specific inspection or specific inspection. In both cases leak tightness test will be carried out in accordance with EN 10246-1 (electromagnetic test).
Other tests according to standards.
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.
Tubes for hydraulic and pneumatic lines ends
Tubes surface protection
(a) oiled
(b) phosphated and oiled
(c) outside surface of tube as chromating – upon agreement only
Packaging of tubes for hydraulic and pneumatic lines
Tubes are packed in round or hexagonal bundles of maximum 2000 kg each, fastened with steel strips.
On request – paper below the stripes and plastic bags at the bundle ends.
Marking of tubes for hydraulic and pneumatic lines – HPL type
Each tube shall be marked with Ink-Jet system along whole tube length according to standard or customer’s specification.
The bundle of tubes shall be marked with a label attached to the bundle.
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 – Steel 37.4 a Steel 52.4.
Calculation was done according to DIN 2413.
