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.
APPLICATIONS
These tubes are construction elements, ready for the assembly of hydraulic and pneumatic cylinders.
NORMS
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 steelgrade E235,tolerance H10 with roughness(Ra) below 1 micron(µm).
For steelgrade 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
Max.W.T.- Min W.T.
ECCENTRICITY: _____________________ *100 ≤ 7.5%
Max.W.T.+ Min W.T.
STRAIGHTNESS:
for OD ≤ 260 mm
se ReH ≤ 500 Mpa 0.0015 L;
se ReH > 500 Mpa 0.002 L;
for OD >260 mm
se ReH ≤ 500 Mpa 0.0025 L;
se ReH > 500 Mpa 0.003 L;
L= total length of the tube, the max. values to be checked on the total tube length.