Seamless & drawn precision steel tubes
Customer benefits
- High dimensional accuracy for inside and outside diameters
- Extremely limited wall thickness tolerances
- Reduced eccentricity
- Smooth drawn surface
- Increased strength values due to cold forming
- Tightly staggered range of dimensions
- Customized heat treatment
- CO2-reduced available (OUR Sustainable Solutions)
Dimensions
Materials
| Steel grade | Examples |
| Structural steels | E235, E355, E420, E460 |
| Case-hardening steels | 16MnCr5, 20MnCr5, 20MoCr4, SAE8617H |
| Quench-and-temper steels |
Non-alloyed steels: C35, C45, C50, C60, Cf53 Alloyed steels: 25CrMo4, 34CrMo4, 42CrMo4 Manganese-boron steels: 22MnB5, 26MnB5, 34MnB5 |
| Special steels | Air-hardening steels: MW700L, MW1000L |
| Other materials on request | |
Lenghts
The supplied lengths are subject to the following distinctions:
a) Production lengths between 4 and 7 m are supplied - unless otherwise agreed. The lengths per order item are not permitted to vary by more than 2 m.
b) Fixed lengths with a permissible deviation from the ordered length of ± 500 mm. Up to 10 % of the delivered quantity may deviate from the fixed length, but not by more than 2 m.
c) Cut-to-length. Extremely narrow tolerances can be agreed for the ordered length.
Further details can be found in our General Product Range.
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. |
CO2-reduced grades
Compared to our conventionally produced pre-material, which still has a CO2 footprint of around 2.1 t CO2/t of steel, our seamless, drawn precision steel tubes with the main grades E235 and E355 are based on pre-material that is produced with a CO2 reduction of more than 50 %. On this basis, the Product Carbon Footprint (PCF) of the seamless drawn precision steel tubes of these grades is significantly reduced. We calculate PCFs using the calculation method verified by TÜV Süd and are pleased to provide these at the customer's request.
You benefit directly from the change in our raw material route by reducing Scope 3 emissions in your greenhouse gas balancing.
For further information on the measures we take to reduce the CO2 emissions of our products and to make our production process sustainable, our sustainability team will be happy to assist you.
MW-protect®: Excellent surface protection
Mannesmann has developed an improved coating system for increased corrosion protection of HPL tubes in particular.
MW-protect® for seamless hydraulic and pneumatic precision steel tubes for according to DIN EN 10305-4 and surface protection with test according to DIN EN ISO 9227 in connection with DIN EN ISO 2081.
The designation according to ISO 2081 should be given as in the following example:
Galvanic Coating ISO 2081-Fe/Zn12/A/T2
Details on the increased protection can be found in the data sheet MW-protect®.
Our Technical Sales would be happy to support you with its application expertise. You can find further details of our seamless precision steel tubes in our General Product Range.
