Boiler construction

Best quality steel for boilers and apparatus

Flender quality steel pipes are employed in numerous applications relating to the construction of boilers and apparatus and stand for consistently high quality. We specialise in pipes from 33.7 mm with seam annealing. In comparison to seamless pipes, they have lower tolerances and more evenness in the internal and external surfaces of the pipe.

We keep a variety of material goods and wall-thicknesses in stock for our customers and also convince with a needs-based production process and flexible delivery times.

Flender boiler pipes – your advantages:

  • Economic solution in premium quality
  • Optimum surface character
  • High accuracy
  • Broad spectrum of goods
  • Flexible production and delivery times

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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:

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