[ Duplex / Architecture ]
[ Duplex / Architecture ]
Precision in series: Hartmann duplex tubes A crucial contribution to Ithra’ s iconic stainless-steel façade was made by Hartmann Edelstahlrohre GmbH, who supplied the high-quality tubes made of 1.4462 duplex steel used as base material. At that time— under Wuppermann on an interim basis— the team at the Wilnsdorf plant produced special tubes with an outer diameter of 76.1 mm and a wall thickness of 1.5 mm, maintaining tight tolerances of just ± 0.1 mm in the outer diameter. This extreme precision was essential for the complex 3D bending process at seele, as each tube had an individual bending radius. The subsequent forming into flat oval profiles of type 112.7 × 12 × 1.5 mm was particularly challenging. The controlled deformation of the duplex material required for this process necessitated a precise prediction of the so-called“ springback” behaviour. Hartmann developed their own calculation formula for this purpose, which goes beyond classic FEM simulations and accurately calculates forming degrees, taking into account varying yield strengths and
In the heart of Saudi Arabia’ s oil fields: The King Abdulaziz Center for World Culture, featuring a 30,260 m ² stainless-steel tube façade. Photo: seele
microstructural proportions( austenite / ferrite). To ensure a visually consistent exterior, all tubes were ground to defined roughness depths and gloss levels. In close collaboration with abrasive manufacturer VSM, special grinding belts were developed specifically for this project, enabling an absolutely uniform finish. Close cooperation with the machine manufacturer Dynobend also enabled the development of customised tool solutions for flat oval tubes, an area in which Hartmann is still considered a specialist today.
Stainless steel as a catalyst for the vision For the stainless steel industry, Ithra represents a prime example of the possibilities offered by modern materials and manufacturing technologies when maximum corrosion resistance, formability and durability are required. Without this material and the engineering innovations, a project of this complexity would have been inconceivable. Duplex steels such as grade 1.4462 prove their exceptional performance and highlight stainless steel’ s importance as a sustainable, enduring material for the future.
Artis 300
Powerful and precise: TIG-DC welding at the highest level
With up to 300 amperes, the Artis 300 delivers stable welding power and ensures clean, precise TIG welds – even on longer jobs. Extensive setting options and simple operation make this a dependable companion for everyday work.
For more information, please visit www. fronius. com / artis