Superior Steel Overseas

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.

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

Cold drawn cylinder tubes inside H8 refers to a specific tolerance class for the inner diameter (ID) of cylinder tubes that are produced through the cold drawing process. The H8 tolerance class is a commonly used precision class for cylinder tubes.

The H8 tolerance means that the actual inner diameter of the cylinder tube will have a tolerance of ±0.08 mm from the specified nominal inner diameter. This tolerance class ensures a tight and precise fit for various applications, such as hydraulic cylinders and pneumatic systems.

The cold drawing process involves pulling a seamless tube through a die to reduce its diameter and improve its surface finish. This process can enhance the mechanical properties of the tube, including its strength, dimensional accuracy, and surface quality.

The combination of cold drawing and the H8 tolerance class results in cylinder tubes with a precise inner diameter, allowing for smooth operation and optimal sealing when used in hydraulic or pneumatic systems.

It is important to note that different tolerance classes, such as H7 or H9, may also be available for cylinder tubes. The selection of the appropriate tolerance class depends on the specific requirements of the application.

When sourcing cold drawn cylinder tubes inside H8, it is advisable to consult with reputable manufacturers or suppliers who can provide tubes that meet the desired tolerance class and other relevant specifications for your application.

Additional Information:

• Minimum Order Quantity: 100 Kg

Additional Information:

• Minimum Order Quantity: 100 Kg