Salzgitter Mannesmann Grobblech GmbH domiciled in Mülheim an der Ruhr is a wholly owned subsidiary of Salzgitter AG. It comprises diverse divisions, with the quarto plate mill constituting its main business area. Drawing from over 130 years' production expertise, the Mülheim location processes over 800,000 t of steel per year. The main product – plate for the manufacture of large-diameter line pipe – is used in renowned pipeline projects (e.g. Nord Stream) around the world. The materials processed cover a comprehensive range, from conventional structural steels to offshore grades for wind energy facilities and steels for pressure vessels – all in a broad spectrum of qualities and dimensions.

At the pipe bending plant of Salzgitter Mannesmann Grobblech GmbH, seamless and welded steel pipes made of carbon, alloyed and high-alloy steels are precision tailored to the customer's specifications using the induction bending process. Given the wide range of dimensions covered, this places exacting demands on the quality of our pipe materials and manufacturing processes. Thanks to the ongoing optimization of the induction bending process in cooperation with Salzgitter Mannesmann Forschung GmbH, the process-controlled bending plant in Mülheim ranks among the world's most efficient facilities of its kind. Our vast experience with this process makes us a competent partner, capable of offering you professional advice on all related questions. 
Special features / advantages for our customers

  • Many years' experience in major national and international projects
  • A comprehensive product portfolio covering a broad spectrum of geometries and dimensions, with finish-rolled plate widths of up to 4.8 m
  • Pipe bends featuring high accuracy of shape with close tolerances, even in the case of extreme wall thicknesses and/or special materials
  • In-depth research within a strong network and high development expertise, even in the case of complex requirement profiles
  • Integrated product development, from steel production to the finished pipe or coated pipe bend

Plate rolling mill

Manufacturing program


  • Deep-sea applications
  • High strength requirements
  • Low-temperature service
  • Sour service
  • Offshore wind applications
  • Conventional structural steels and pressure purposes


  • Thickness: 6 mm – 175 mm
  • Width: 1,200 mm – 4,800 mm
  • Length: 4,000 mm – 24,000 mm
  • Unit weight: up to 22 t

Steel grades

  • Up to and including S690 / X100 (yield strength up to 690 MPa)
  • Conventional and fine-grain structural steels S235 to S460 in accordance with EN 10025-2 to 5
  • Offshore steels up to S460 acc. to EN 10225
  • Shipbuilding steels acc. to DNV/GL and LR
  • Steels to international standards (e.g. ASTM, CSA) or customer specifications


  • ISO 9001 : 2008
  • ISO 14001 : 2004
  • BSOHSAS 18001 : 2007
  • ISO 50001 : 2011
  • Lloyd's Register
  • ABS qualification (Tendon pipe, Tension leg)
  • HPQ-Deutsche Bahn
  • Weldability certificate acc. to EN 10225
  • AD 2000 Code of Practice W0
  • In-process control in accordance with DIN EN 10025-1:2005, Appendix ZA
  • CE Mark (declaration of conformity)
  • Quality assurance system for materials production in accordance with Pressure Equipment Directive 97/23/EC and AD2000 Code of Practice W0
  • Certificate of constancy of Performance (CoP) in accordance with Construction Products Regulation 305/2011 EU, Appendix III
  • Certificate of conformity ÜHP, Building regulations list A, part 1

Pipe bending plant

Manufacturing program

Pipe bends

  • Oil and gas pipelines
  • Riser bends for offshore platforms
  • Power plant piping systems
  • Steel building and bridge construction
  • Umbilicals for offshore windparks


  • Outside diameter: 114.3 mm – 1,626 mm
  • Wall thickness: 6.3 mm – 170 mm
  • Bending radius: to customer's specifications
  • Bending angle: up to 180°


Welded and seamless tube and pipe in steels from the following materials groups:

  • Line pipe steels, including TM steels
  • Case-hardening and heat-treatable steels
  • High-strength and high-strength high-temperature steels
  • Stainless and acid-resistant steels
  • Clad steels
  • Nickel base alloys

Production standards

  • ISO Standards
  • DIN / DIN EN
  • API Specifications
  • DNV Rules
  • ASME Standards
  • ANSI Pressure Piping Code
  • ASTM Standards
  • MSS Standard Pressure Practice
  • British Standards
  • Dutch Standards
  • Canadian Standards
  • Norsok
  • Technical Rules for Steam Boilers (TRD)
  • VdTÜV Codes of Practice
  • RCCM Code (Areva)
  • KTA Safety Standards (Rules for the Construction of Nuclear Facility Components)