Superior Steel Overseas

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 micron (µm).

GENERAL FEATURES
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.

NORMS

 COLD DRAWN SEAMLESS TUBES              EN  10305-1                                                              

COLD DRAWN WELDED TUBES                EN 10305-2                                                              

DIMENSIONAL FEATURES OF THE ID        EN 20286

TUBES SUITABLE FOR SHAFTS

APPLICATIONS

Itis used for cylinders on self-propelled cranes, hydraulic systems for lifts, tipping pistons and telescopic cylinders for automotive and hydraulic platforms. They can replace solid piston rods for pneumatic cylinders in order to reduce mass forces in high speed pistons.                                        
NORMS

EN 10305-1

TOLERANCES AND SIZES

ID: standard stock material is according to EN 10305-1. In case of tubes suitable for telescopic cylinders, that can be supplied on request, the tolerance allowing the machining also on the ID has to be agreed at the time of the order.

W.T.:                       ± 10% with a minimum of  ±0.1 mm

                                  Max.W.T.- Min W.T. 

ECCENTRICITY:   _____________________        *100                         

                                 Max.W.T.+ Min W.T.

STRAIGHTNESS:

for OD                   ≤ 260 mm

                               if ReH ≤ 500 Mpa 0.0015 L;

                               if ReH > 500 Mpa 0.002 L;

for OD                   >260 mm

                               if ReH ≤ 500 Mpa 0.0025 L;

                               if ReH > 500 Mpa 0.003 L;

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.

APPLICATIONS

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.

NORMS,

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.  

                                  _____________________        *100

                                 Max.W.T.+ Min W.T.

STRAIGHNESS:

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 lenght of the tube, max. values to be checked on the total tube length.