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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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Product Details:
Steel GradeST52/E355, ck20, ck45, 34CrMo4, SAE 1026, SAE4130,SAE4135, SAE4140, 27SiMn
MaterialStainless Steel
Outer DiameterLess than and equal to 260 mm
Inner DiameterGreater than 260 mm
Thickness3 - 35 mm
TechniqueCold Drawn
Surface TreatmentPainted, oiled, polished...
Quality StandardDIN 239, EN 10305 and ASTM A519
Cylinder diameterID28~OD400, ID28~OD120
Wall thickness+, - 8%
ApplicationHydraulic pressure, pneumatic cylinder, oil pump barrel, motor body

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.

 

FEATURES :
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.

 

STRAIGHTNESS:

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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Product Details:
Size2 inch, 3 inch, 3/4 inch, 1/2 inch
Steel GradeE235, E335
Unit Pipe Length18 meter, 6 meter, 3 meter
FeaturesAnealed
MaterialStainless Steel,Nickel Alloy,Carbon Steel
ToleranceH9-H10
Roughness0.8 micron - 1 micron or below
ShapeCylindrical
ApplicationDrinking Water, Gas Handling, Utilities Water, Chemical Handling

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 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

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Product Details:
Size1 inch, 3/4 inch, 1/2 inch, 2 inch, 3 inch
Unit Pipe Length18 meter, 3 meter, 6 meter, 9 meter
FeaturesPickled, Anealed
MaterialStainless Steel,Nickel Alloy,Carbon Steel
TechniqueCold Drawn
Thickness50 - 360 mm
Outer Diameter60 - 500 mm
ID toleranceH7, H8
OD toleranceDIN2391-2 or EN10305-1
W T tolerance+/-7.5%
RoughnessBelow 0.4 Micron
End finishPlain ends with square cuts, free of burrs, bevelled ends
ApplicationHydraulic pipe

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).


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.

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