Our history

Steel pipe specialists for more than a century

Flender is an innovative family business based in Siegen and has been around for more than 100 years. Founded by Rudolf Flender in 1910, the company is currently operating under the leadership of the third generation of Flenders.

Milestones of our company history:


Flender becomes even more qualified

The new year gets under way with more new certifications, including the API 5 L, API 5CT and GOST


Premium quality reaffirmed by new certifications

Flender has been further certified by several international testing institutes, including German Lloyd, Bureau Veritas, TÜV 


Construction and commissioning of a new HFI pipe welding line

Round tube pipes from 33.7 mm -114.3 mm in pipe lengths up to 24 m with seam annealing (≤ 800N/mm2))


Flender celebrates its 100 year anniversary

From a manufacturer of simple steel products to producers of innovative HFI-welded premium steel pipes.


Construction and commissioning of a new HFI direct moulding system

Manufacture of standard and special profile pipes with up to nine edges

Construction of the first continuous pipe manufacturing system (Flender Flextubing)

Round tube pipes without transverse welds (coiled tubing ≤4,100m/roll)


Construction and commissioning of a new slitting line for hot-rolled coils

Slitting steel coils as part of in-house production


Start to produce pickled precision steel pipes

Pipes with particularly low tolerance, for materials handling, etc.


First production of steel line pipes with PE plastic casing

Pipes for flammable gases and liquids, water and solids


Commissioning of the first pipe rolling machine and welding machine for profile pipes

Manufacture of profile pipes for a wide range of applications


Commissioning of the first pipe rolling machine and welding machine for round tube pipes

Semi-automatic production system for longitudinally welded pipes


Company founded by Rudolf Flender

Manufacture of sheet metal goods for industry and agriculture

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Dear visitor to this website,

the Rudolf Flender Rohr GmbH pipe production in Siegen was permanently closed on December 31, 2020. The production is closed and all supplies and machines have been sold. We ask you to pay attention to this!

To preserve, remember and honor the work of all employees who have written a total of 110 years of company history, this website remains online, even if no more products are offered for sale.

To contact us, please dial +49 (271) 3305-0 or email: info@flender-rohr.de.

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