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Donges SteelTec GmbH

150 years of experience in structural steel engineering, innovative designs and buildings and a highly motivated and competent workforce: Donges SteelTec GmbH in Darmstadt. The range of our company’s business activities includes the planning, development, design, fabrication and assembly of architecturally sophisticated projects in the fields of steel bridge construction, steel structural engineering, as well as industrial facade and turnkey construction, and with its references, it is one of Germany’s market and technology leaders.

The history of the company can be traced back to 1872, when Georg Donges founded a locksmith business. Up until 2008, Donges was a family-run business. From 2008 to 2017, Donges belonged to the globally active Japanese Group, Mitsubishi Hitachi Power Systems. Since November 2017, Donges has been part of the Munich-based Mutares Group. 

Donges is continuously adapted to the requirements of modern technology and has a production facility at its headquarters in Darmstadt with its own workshops on asite of 65,000 square-meters.

With 180 highly-qualified, experienced employees, we offer our customers services involving all aspects of construction projects from a single source, from project planning, structural engineering and design, right down to fabrication and assembly. The annual production capacity at the Darmstadt plant is approx. 20,000 metric tons.

The technical expertise and experience of our company is manifest in the completion of many major projects and outstanding buildings such as the curved steel structures of the Berlin Central Station, the Porsche Museum in Stuttgart, the Stuttgart exhibition center’s multi-level parking garage, the Wesel Rhine Bridge, the Schönebeck Elbe Bridge, the stadium roof of the Rhein Neckar Arena (TSG 1899 Hoffenheim), the coal-fired power plants in Wilhelmshaven, Rotterdam, as well as in Kusile and Medupi in South Africa, or the launch table and umbilical mast of the ARIANE 6 launch site in Kourou, French Guiana.

If you would like to learn more about the history of Donges, you can read more about it here.

Corporate Film Donges SteelTec

History and tradition from

1872 – 2025

If you would like to learn more about the history of Donges, you can read more about it here.

History

Dr. Wolf Cornelius

CEO

2022 – today CEO Donges SteelTec GmbH

2008 – today multiple functions

2000 – 2007 Technical Manager

1997 – 2000 Orthmann & Herbst-Kettner GmbH / Crown Simplimatic GmbH Hamburg – CEO
1993 – 1997 Piepenbrock Verpackungstechnik – CEO
1990 – 1993 KHS- SEN Maschinenbau AG – Plant Manager
1986 – 1990 Schenk Filterbau GmbH, Technical manager
1980 – 1985 Johann Stahl Apparatebau, Manager large tank construction
1976 – 1980 Preussag Metall – Operations Manager
1969 – 1975 Schering AG – Process Development Group (PhD)

Dirk Lehmann, Dipl.-Ing. (FH), Dipl.-Wirtsch.-Ing. (FH)

Head of Building Construction Division

Since April 2023 Manager Building Construction Division of Donges Steeltec GmbH and Authorised Signatory

  • 2017 – April 2023 Managing Director
  • 2003 – 2017 Sales Manager and Authorised Signatory
  • 2000 – 2003 Sales Engineer
  • 1996 – 2000 Project Manager
  • 1998 – 2001 Industrial Engineering and Management – at the TFH Wildau, degree Dipl. Wirtsch.-Ing. (FH)
  • 1992 – 1996 Mechanical engineering (steel construction) – at the FH Dortmund, degree Dipl.-Ing. (FH)

Stephan Langer, Dipl.-Ing.

Head of Bridge Construction Division

Since January 2009, Head of the Bridge Construction Division at Donges SteelTec GmbH and authorized officer

Donges Stahlbau GmbH, Darmstadt

Deputy Head of Bridge Construction

Project Engineer Bridge Engineering, since 1999 Division Head of Sales Bridge Construction

Engineering construction – at the Darmstadt Technical University, degree Dipl.-Ing., specialization in steel construction

Contacts

Responsible for the areas of

Bridge Construction

Stephan Langer
(Dipl. Ing.)

Building Construction

Dirk Lehmann
(Dipl.-Ing. (FH), Dipl.-Wirtsch.-Ing. (FH))

+49 (0) 06151 889-306

+49 (0) 06151 889-260

Facts + Figures

Founding:

1872 to 2007 Donges Stahlbau GmbH, family-run business; 2008 to 10/2017 Donges SteelTec GmbH, member of the Mitsubishi Hitachi Power Systems Group; since 11/2017 part of the Munich-based Mutares Group.

Employees:

180

Operating performance:

EUR 65 million

Annual tonnage:

max. 20,000 tons

Monthly capacity:

max. 1,700 tons

Inventory of primary material:

max. 6,000 tons

Unit weight and dimensions:

max. 160 tons
Dimensions 50 x 5 x 3 meters

Plant premises:

Total area: 65,500 m²
Covered area: 34,900 m²

Certificates:

DIN EN ISO 9001:2015
DIN EN 1090-1:2009+A1:2011
DIN EN ISO 17660
DBS 918005
DIN EN ISO 3834-2
SCC**Certificate, SCC-VAZ 2021

Transport connections:

Rail and road

Association memberships an Cooperations:

Hessen Metall (Association of the Metal
and Electrical Companies in the Federal State of Hesse)

VhU (Association of Hessian Business Associations)

h_da (Dual Studies Civil Engineering at Hochschule Darmstadt)

Facts + Figures

Donges SteelTec GmbH

EUR 65 million

Operating performance

180

Employees

max. 20,000 tons

Annual tonnage

Machinery and Equipment

  • 40 CAD workstations

    RZ-Industriebau, Tekla

  • 1 Steel shot-blasting machine
  • 2 Sawing and drilling lines
  • 1 Punching and shearing line
  • 1 Beam bending machine
  • 2 Milling equipment
  • 2 Submerged arc welding machines
  • 1 Trapezoidal stiffener attachment portal
  • 5 Welding and cutting systems
  • 1 Drilling and welding equipment
  • 2 Post-production shot-blasting sheds

    All machines online CNC-controlled

  • 60 overhead, gantry and bracket cranes

    from 0.8 t – 80 t for lifting within the plant

  • 1 Section lifting vehicle

    156 t payload

Machinery and Equipment

Technology and Innovation

40+

CAD workstations

60+

Overhead, gantry and
bracket cranes

6

Welding stations

Certifications

Approvals and Manufacturer Qualifications

The high standard of our quality and process management provides for a high degree of customer satisfaction, boosts our company’s competitiveness in the steel construction market and leads to the continuous improvement of our internal procedures and processes, in addition to optimizing the use of resources.

  • DIN EN ISO 9001:2015

    Quality management system for “planning, development, design, manufacturing and assembly in power plant construction, steel bridge construction, steel building construction, industrial facade construction and turnkey development”

    DIN EN ISO 9001:2015

    Download .PDF

  • DIN EN 1090-1:2009+A1:2011

    Conformity of factory production control for “structural components and assemblies for steel structures up to EXC4 according to EN 1090-2” for load-bearing structures in all types of buildings

    DIN EN 1090-1:2009+A1:2011

    Download .PDF

  • DBS 918 005

    Manufacturer-based product qualification of DB AG for the construction of railway bridges and other engineering structures

    DBS 918 005

    Download .PDF

  • SCC**-Managementsystem, SCC-VAZ 2021

    International management system for industrial safety, health and environmental protection for “planning, development, design, fabrication and assembly in power plant construction, steel bridge construction, steel building construction, industrial facade construction and turnkey finishing”

    SCC**-Managementsystem, SCC-VAZ 2021

    Download .PDF

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Certificates

Approvals and Manufacturer Qualifications

Donges SteelTec possesses all manufacturer qualifications required for planning, development, design, fabrication and assembly in steel bridge construction, steel building construction, industrial facade construction and turnkey development.

Sustainability

In view of ongoing climate change, Donges SteelTec is committed to sustainability in all aspects of its business activities that it can influence, including the use of modern technologies, cooperation with business partners, and all joint activities. The focus is on combining the use of sustainable materials and sustainable manufacturing processes to create sustainable products.

  • ECOVADIS Sustainability Scorecard - Bronze Medal 2025

    Download .PDF