Precision tubes for production of bearings


Precision tubes for production of bearings use the cold drawing process. Rolled seamless tubes are used as the semi-finished product.

Bearing tubes


Dimensions of the bearing tubes

Steel grades for bearing tubes

OUTER DIAMETER (OD)22,0 – 70,0 mm
WALL THICKNESS (WT)3,0 – 8,0 mm
DIN 17 230100Cr6
STN 14 109
Dimensional standard SIZES (OD x WT) Dimensional table
STNby customers specification22.0 x 3.0 – 70.0 x 8.0 mm
Standard TDC Steel grade (open product)
STNby customers specification
DIN17230
ČSNby customers specification

Length of bearing tubes

length 3 000 mm with tolerance +/- 500 mm.

Testing of bearing tubes

Testing is done according to DIN 17 230.

Tolerances of tubes for bearing production

outside diameter
D < 50 mm
0 – +0.15 mm
outside diameter
D > 50 mm
0 – +0.25 mm
wall thickness-/+ 7,5 % (after agreement 5 -/+ %) of the wall thickness

Ends of the bearing tubes

The tubes with deburred ends or ends customized for welding.
The tubes with deburred ends or ends customized for welding.
The ends are vertical to the longitudinal axis and are without burrs.
The ends are vertical to the longitudinal axis and are without burrs.

Tubes have its ends smooth, plain square cut ends, one beveled 0,5 to 4,00 x 45°.

Packaging of the fine-grained tubes

Tubes are packed in circular weighing between 1 000 – 3 000 kg.

Tubes bound with a steel band.

Packaking-STANDARD-tubes bound with a steel band
Packaking-STANDARD-tubes bound with a steel band
Packaking-STANDARD-bundle tied down by steel strap underlaid by paper
Packaking-STANDARD-bundle tied down by steel strap underlaid by paper
Packaking-STANDARD-PLUS-paper tape and polyethylene foil
Packaking-STANDARD-PLUS-paper tape and polyethylene foil
Packaking-STANDARD-PLUS-the bundle placed into a wooden box
Packaking-STANDARD-PLUS-the bundle placed into a wooden box
Packaking-PREMIUM-B-into a wooden box in which the tubes are wrapped in foil
Packaking-PREMIUM-B-into a wooden box in which the tubes are wrapped in foil
Packaking-PREMIUM-C-the bandles are wraped into and plastic foil
Packaking-PREMIUM-C-the bandles are wraped into and plastic foil
Packaking-PREMIUM-D-placing the whole shipment into foil+vacuum sealed
Packaking-PREMIUM-D-placing the whole shipment into foil+vacuum sealed

Steel hardness for bearing tubes

After the soft annealing the hardness ranges is 174 – 220 HB.
Hardness value dispersion along the length of the tube is 15 HB maximum.
Minimum hardness according to the hardness test is 61 HRc.

Demagnetizing

Residual magnetism 10 Oe maximum.

Microstructure of bearing tubes

Testing procedures according to SEP 1520:
• carbide sizes 2.1 – 2.3,
• lamellar pearlite 3.0,
• carbide net 5.2,
• carbide line spacing (max 6.3 – continuous, max 7.3 – released).

Marking of bearing tubes

Bundles of tubes are marked with label.

Marked by a label
Marked by a label
Marked with spray either by a white or black color using InkJet
Marked with spray either by a white or black color using InkJet
Marked by stamping the data
Marked by stamping the data

Micropurity

Tested according to DIN 50602..
Total value of oxide and sulphur micropurity K3 <= 10.

Surface protection of bearing tubes

Surface of the tubes is oiled.

Notes

The tubes also may be delivered as hot rolled.
It is also possible to deliver bearing tubes according to STN EN ISO 683-17.


It is annealed and automated steel that it is destined for hot treatment, part 17: steel for roller bearings.

According to DIN 50049 – EN 10204 – 3.1.B.


1 mm / m (1 : 1 000) measured on the outside surface, maximum 2.5 mm / 3000 mm.

Tubes are delivered with after its surface was soft annealed.

Maximum depth of defects is 0,25 mm and it includes decarbonizing.



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