These are cold drawn WELDED tubes that get, during the cold drawing the cold drawing process, a good roundness, and a high ID precision, that satisfies tolerances H9 or H10 according to EN 20286.
These tubes are construction elements, ready for the assembly of hydraulic and pneumatic cylinders.
Cold Drawn Welded Tubes EN 10305-2
Dimensional Features Of The ID EN 20286
Dimensional Tolerances :
OD: see dimensional tables of the bore cylinder tubes inside H9 or H10.
ID : For steel-grade E235,tolerance H10 with roughness(Ra) below 1 micron(µm).
For steel-grade E335,tolerance H9 with roughness(Ra) below 0.8 micron(µm).
(see dimensional table for welded smooth bore cylinder tubes inside H9 or H10).
W.T.: ± 7.5% with a minimum of ±0.1 mm
Our standard stock includes cold drawn tubes, both SEAMLESS and WELDED, with machined ID according to tolerance H8 EN 20286 and roughness (Ra) below 0.4 microns (µm).
Chemical and mechanical features are the same of the raw tube (see steels-table for cold drawn tubes suitable for honing), which is machined on ID. The dimensional tolerances are the same of the raw tube, except for the ID, which is according to H8.
Approx. Rs 200 / Kilogram
The manufacturing process and strict tests foreseen for the cold drawn SEAMLESS and WELDED tubes give as result a fine grain steel with high pureness degree together with a high dimensional precision.
These tubes are intended to resist to internal pressure and are therefore used for the manufacture of cylinders. They are produced in all the sizes used for hydraulic and pneumatic applications, in different steelgrades and delivery conditions.
COLD DRAWN SEAMLESS TUBES - EN 10305-1
COLD DRAWN WELDED TUBES - EN10305-2
DIMENSIONAL TOLERANCES ACCORDING TO EN 10305-1/2
O.D.: see dimensional table for tubes suitable for honing.
W.T.: welded tubes: ±7.5% with a minimum ±0.1 mm
seamless tubes: ±10% with a minimum ±0.1 mm
ECCENTRICITY: welded tubes: ≤ 7.5%
seamless tubes: ≤ 10%
to be calculated with the follwing formula:
Max.W.T.- Min W.T.
Max.W.T.+ Min W.T.
for OD ≤ 260 mm
if ReH ≤ 500 Mpa 0.0015 L;
if ReH > 500 Mpa 0.002 L;
for ID >260 mm
if ReH ≤ 500 Mpa 0.0025 L;
if ReH ≤ 500 Mpa 0.003 L;
L= total length of the tube, max. values to be checked on the total tube length.
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