Standard precision welded tubes are widely used in the engineering industry in the production of machine and equipment components.
The requirement for the precision of the tubes also determines the method of production. The tubes are supplied as cold drawn.
Cold-drawn welded tubes are intended for the engineering industry, energy and mainly for the production of automotive components:
• Fuel / oil distribution and engine
• Chassis
• Car steering systems
• Car bodies
| OUTSIDE DIAMETER (OD) | 6,0 – 20,0 mm |
| WALL THICKNESS (WT) | 1,0 – 1,5 mm |
| EUROPEAN STANDARDS | EN 10305-2 |
| EN 10305-2 | E235 (E155, E195, E275, E355 – by agreement) |
| Marking of steels according to EN standards: E – steels for machine parts 235 – minimum yield strength in N/mm2 +N – normalized +A – soft annealed +LC – cold drawn / soft +C – cold drawn / hard | |
| Types of tube lengths supplied: (a) random production lengths, in range of 4 – 7 m, (b) approximate lengths , in range of 4-7 m with a length tolerance of ± 500 mm, (c) exact lengths, with tolerances: • in range of 4-5 m – 0 + 5 mm • in range of 5-7 m – 0 + 10 mm • over 7 m – according to the agreement | |
Tubes are usually tested by a specified test.
Mandatory testing:
(a) cast / chemical analysis
(b) tensile test,
(c) dimensional inspecti,
(d) visual inspection of the tubes surface.
Optional testing:
a, flattening test or drift expanding test,
b, Eddy current leak test according to EN ISO 10893-1,
c, Eddy current test for longitudinal defects according to EN ISO 10893-2, class E3.
The tubes are supplied with anti-corrosion protection – preservative oil. While ordering, it is necessary to agree upon the method and means of temporarily protecting the surface of the tubes or none surface protection.
Special treatment of tube ends only by agreement.
The tubes are made by cold drawing from HF welded calibrated tubes. The surface of the tubes corresponds to the relevant standards and depends on the production process and the final heat treatment of the tubes.
Surface roughness value:
according to EN – Ra ≤ 4 mm
The wall thickness tolerance is +/-7.5%, but at least +/-0.1 mm.
(a) tubes bound with a steel band,
Packaging by agreement:
(b) tubes wrapped in plastic sheets or burlap,
(c) tubes in wooden crates.
Precision welded tubes are supplied in packages with a circular or hexagonal outline with weight of 300 – 3 500 kg
Tubes are usually supplied without marking.
The necessary and required data are listed on the label attached to the tube bundle:
a, the name or logo of the tube manufacturer,
b, dimension,
c, EN standard number,
d, steel grade,
e, delivery status – heat treatment,
f, heat number,
g, identification number (order number, order item number).
Are you interested in cooperation? Send us an inquiry, or order the goods directly from stock.
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