ADVERTORIAL FEATURE | MANNESMANN STAINLESS TUBES
Innovative tubular solutions
Mannesmann Stainless Tubes has a proven pedigree in providing high specification seamless stainless and nickel alloy tubes and pipes across the nuclear island
WHEN SUPPLYING HIGH SPECIFICATION SEAMLESS stainless and nickel alloy tubes and pipes to meet the needs of the global nuclear power industry our experience and qualification demonstrates and gives our customers complete assurance in our performance. As today’s nuclear technologies evolve it is essential that we also bring our nuclear customers and partners the innovation and flexibility they depend upon to meet tomorrow’s standards. Adapting manufacturing technologies to changing
markets and customer expectations is a key focus for the team at Mannesmann Stainless Tubes (MST). Fundamental to the innovation we bring to our
customers is the integration and control of the complete manufacturing process.
Hot Extrusion:
We utilise two extrusion presses within our facilities: ● Remscheid, Germany - from 44.5 to 122mm Outside Diameter and
● Montbard, France – from 33.4 to 280mm Outside Diameter
Hot extrusion is a key determinate process in the structure, quality, mechanical properties and ultimately length of a seamless stainless steel or nickel alloy tube or pipe. Supporting the need for longer tube lengths, in both hot
and cold finished products, the extrusion press located in Montbard, France has recently been upgraded to an extrusion force of 4300 tons.
The final properties and the dimensional characteristics
such as straightness, roundness and eccentricity limits must be maintained along the complete length. All these facts need to be considered and consistently controlled. From the important starting point of the hot extrusion,
we have a product that can either go through the finishing process as a hot finished product or be used as a mother tube or “hollow” – which forms the starting point for the cold manufacturing process.
Cold Production: The two technologies we use are cold pilgering and cold
drawing. ● Cold pilgering, maximum 280mm (11.024”) Outside Diameter, at our Remscheid, Germany facility, for nuclear applications typically associated with piping systems or mechanical tube (hollow bar) – bringing our customers the benefit of the latest and one of the largest cold pilger mills in the world.
● Cold Pilgering, for applications typically up to 88.9mm (3.5”) Outside Diameter, from our Costa Volpino, Italy facility for applications associated with heat exchanger, instrumentation tubing and special profiles.
● Cold Pilgering is also used within our Houston, US facility from 6.35mm (1/4”) to 101.6mm (4”) Outside Diameter.
● Cold Drawing, from 1.6mm (1/16”) Outside Diameter, from our Issoudun, France facility; with many in-core related applications.
Production of tubes at our Issoudun, France facility is focused on cold drawing technology which allows thin wall tolerance control down to +/-0.02mm with tube diameters as small as 1.6mm and lengths up to 43m (141ft) in straight length with serpentine coils being an alternative form of supply. The cold drawing process utilises hollows from the
extrusion or cold pilgering process and reduces these to the required dimensional size in a number of draw passes. In the context of handling long tubes, the manufacturing steps of drawing, degreasing, annealing, testing and final inspection all had processes specifically developed to take into consideration the length of the product.
Above: Precision Tubes 42 | February 2022 |
www.neimagazine.com
Quality: Nuclear standards: nuclear pedigree. Our quality system accreditations and extensive customer references demonstrate our proven capabilities across the global nuclear industry. From the control of our raw materials to final inspection, certification and shipment we apply the highest standards
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