Mannesmann Line Pipe GmbH's experience in welded pipe production reaches back 130 years. With production sites in Hamm and Siegen, the company is a global player and technology leader in HFI-welded steel pipe. The manufacturing program comprises line pipe for oil, gas, water and wastewater pipelines as well as tube and pipe products for exploratory drilling projects, energy production and storage, district heat and refrigeration, machinery and plant construction, as well as power transmission. For the renewable energies market, the company chiefly supplies circular, square and rectangular steel hollow sections for onshore and offshore structures. Particularly in the offshore segment and under the umbrella of the Salzgitter Group, Mannesmann Line Pipe offers innovative solutions for structural tubes in primary, special and secondary steel.

Manufacturing program

Longitudinally high-frequency induction (HFI) welded steel pipe


  • Outside diameter: 114.3 mm – 610.0 mm
  • Wall thickness: 3.2 mm – 25.4 mm
  • Length: up to 18 m

Steel grades

  • S235 – S460
  • Outside diameters from 355.6 mm onwards and wall thicknesses up to 25.4 mm: S355
  • All dimensions in S355J2H as well as S355K2H, S355NH and S355NLH acc. to EN10210, EN10219 or S355G13+N as well as S355G1+N acc. to EN10225

Square and rectangular MSH sections


  • 250 x 250 mm to 500 x 300 mm and/or 400 x 400 mm
  • Wall thickness: 6.3 mm – 25.4 mm
  • Length: up to 16 m

Steel grades

  • S355J2H as well as S355K2H, S355NH and S355NLH acc. to EN10210
  • S355G13+N as well as S355G1+N acc. to EN10225
  • Other specifications on request

Special features / advantages for our customers


  • MAPEC® Coatings
    • Polyethylene (PE)
    • Polypropylene (PP)
    • Polyamide (PA)
  • Fusion-bonded epoxy (FPE)
  • Diverse coatings for hydraulic structural engineering
  • Other coatings on request
  • Short delivery times thanks to well-organized stocking systems (starting material, pipes) for renewable energy projects
  • Our products meet the most exacting specifications in surface condition, straightness, roundness and diameter accuracy
  • Research project KOWIND: Development of a novel anti-corrosion coating technology for offshore wind turbines


  • BS OHSAS 18001
  • BV
  • CE
  • DNV
  • GL
  • LRS
  • Declaration of Performance acc. to EN 1090
  • EN ISO 9001
  • EN ISO 14001

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