Welded & drawn precision steel tubes

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Description

Our welded, drawn precision steel tubes are manufactured by cold drawing of HFI-welded hollows. In this process, both the diameter and the wall thickness are typically reduced. The tubes are formed through cold drawing, which ensures their high dimensional accuracy and excellent surface finish. The mechanical and technical properties of the tubes can be specifically tailored to the respective applications through cold forming and subsequent heat treatments. 

Your benefits

  • Exceptionally high dimensional accuracy for inner and outer diameters
  • Very tight wall thickness tolerances
  • Minimal eccentricity
  • Smooth drawn surface
  • Increased strength due to cold forming

Dimensions

Outside diameter
from to
16 mm 120 mm
0.630 inch 4.724 inch
Wall thickness
from to
0.8 mm 7.5 mm
0.031 inch 0.295 inch
Other dimensions available upon request
Detailed Dimensions Table

Further information

Lengths

The supplied lengths are subject to the following distinctions:

a) Production lengths between 4 and 7 m (13.123 - 22.966 ft) are supplied - unless otherwise agreed. The lengths per order item are not permitted to vary by more than 2 m (6.561 ft).

b) Fixed lengths with a permissible deviation from the ordered length of ± 500 mm (1.64 ft). Up to 10 % of the delivered quantity may deviate from the fixed length, but not by more than 2 m (6.561 ft).

c) Cut-to-length. Extremely narrow tolerances can be agreed for the ordered length.

Standards & materials

We produce our steel tubes in accordance with internationally recognized standards and use different, carefully selected materials depending on the application. You will find various standards and the materials specified therein under the following link. Further standards can be agreed on request. Additionally, properties and materials outside the usual standards can be specified and agreed. Our Technical Customer Support will support you in all matters relating to material selection and technology.

Learn more about standards & materials
Delivery conditions
Designation Symbol Description
Cold finished, hard +C No heat treatment after the last cold forming pass. The tubes therefore feature lower uniform strain and elongation at rupture.
Cold-finished, soft +LC The final heat treatment is followed by a cold finishing pass (cold drawing) with a slight reduction of the cross section. Given appropriate further processing, the tubes may be cold formed to a greater extent than in the +C delivery condition (e.g. by bending and/or expanding).
Cold finished and stress-relieved +SR The last cold forming pass is followed by a heat treatment. Thanks to the reduced lattice stresses, the tubes can be more readily shaped or machined.
Soft annealed +A After the last cold forming pass, the tubes are annealed in an inert gas atmosphere. The associated forming of the plate shaped cementite results in reduced hardness and good forming properties.
Normalized +N After the last cold forming pass, the tubes are normalized in a controlled atmosphere.
Quenched and tempered +QT The quench-and-temper treatment increases the material's strength, toughness, and wear resistance. It is carried out on materials with increased carbon contents. Quenching at high temperature gives the material very high hardness. The required strength and toughness are achieved by tempering. The hardened product is then reheated to a specific temperature and cooled in air. This reduces the material's hardness and increases its toughness.
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Tests
[Translate to Englisch:] Foto einer Prüfung bei Mannesmann Precision Tubes

We conduct tests in accordance with the requirements of the relevant standard.

Additional tests can be agreed upon.

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Tube processing

We have acquired our expertise over many years and offer a wide range of possible further processing steps for steel tubes. We actively support you with your plans - from sawing and machining of the tube blank to complex bending and upsetting operations.

We can also reduce eccentricity and improve concentricity by turning and grinding, create complex geometries with processes such as rotary swaging and axial forming, and modify properties with the aid of partial heat treatment.

Learn more about tube processing options
[Translate to Englisch:] Bild eines innen geschälten Rohres
[Translate to Englisch:] Bild von aufgeweiteten/reduzierten Rohren
[Translate to Englisch:] Bild eines gestanzten Rohres
Engineering

Do you have any questions regarding the further processing of tubes to tubular components for engineering purposes? Our experts will be happy to support you. If required, we accompany the entire process - from the idea to the development and production of pre-series parts and prototypes to the product ready for series production.

Depending on the intended application, we advise you on the selection of the right tube production route, suitable heat treatment, and the necessary processing steps - which includes useful surface protection strategies. For this purpose, we have a wide range of options for computation and simulation as well as testing and measuring processes available.

 

Mannesmann Precision Tubes
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