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Cold Drawn Tubes

COlD DRAWN TUBES:

GERNERAL FEATURES

These products are Manufactured by cold drawing of seamless and welded fully killed steel tubes.This Particular process assures a high dimensionals precision,while different kind of following heat treatments are used to reach different levels in mechanical properties.

Types

The different kinds of cold drawn tubes ready on stock cover a wide range of applications :

  • COLD DRAWN SEAMLESS AND WELDED TUBES SUITABLE FOR HONING

  • COLD DRAWN SEAMLESS AND WELDED TUBES INSIDE H8

  • COLD DRAWN SEAMLESS TUBES FOR SHAFTS

  • WELDED SMOOTH BORE CYLINDER TUBES INSIDE H9 OR H10.

  • COLD DRAWN SEAMLESS TUBES FOR HYDRAULIC AND PNEUMATIC POWER SYSTEMS.


    STEELGRADES AND DELIVERY CONDITIONS

    1.COLD DRAWN/HARD

    ( Cacc.EN10305/BK acc.DIN2391)

    No heat treatment after final cold drawing.

    2.COLD DRAWN/SOFT

    ( LC acc.EN10305/BKWacc.DIN2391)

    The final heat treatment is followed by a suitable drawing pass

    (limited reduction of area)

    3.STRESS RELIEVED

    ( SRacc.EN10305/BK Sacc.DIN2391

    After the final cold drawing process,tubes are stress relieved in controlled atomosphere in order to reduce work hardening due to the cold forming process.

    4.ANNEALED
    (Aacc.EN10305/GBKacc.DIN2391)
    After final cold drawing process,tubes are annealed in controlled atomosphere.

    5.NORMALIZED
    (Nacc.EN10305/NBKacc.DIN2391)
    After final cold drawing process,tubes are normalized in controlled atomosphere at a temperature exceeding the austeniting temperature.

    *Standard stock

    1.The alumininum content is no longer ruled when the steel contains an adequate percentage of nitrogen binding elements,like Niobium,vanadium or Titanium.
    2.0.080 ≤V ≥0.15;NB ≤0.070;TI ≤0.050;Nb V ≤0.20(%on mass).
    3.Steel accourding to manufacture's specification ,not forseen by any norm.CU ≤0.70;Cr ≤0.30; ≤0.80;Mo ≤0.10;V ≤0.20;Ti ≤0.040;N ≤0.020;Nb ≤0.050;Nb Ti V


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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.

 


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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.

NORMS3.

 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;


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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.


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