Welcome to
Energietechnik Essen GmbH!

Energietechnik Essen GmbH is the global specialist in rotor retaining rings for energy-sector machinery and a byword for safety and reliability in turbo-generators. The company also develops and produces nitrogen-alloyed steels.

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File nameFile size
Energietechnik Essen GmbH - BV- Heat Treatment of Materials for Marine and Offshore units including crankshafts 343,08 KB Download
Energietechnik Essen GmbH - DNV GL - Heat Treatment for forgings of carbon, carbon-manganese and alloy steel grades 210,20 KB Download
Energietechnik Essen GmbH - Framatome - Standard KTA 1401 with AVS D 100/50, IAEA GSR Part 2, IAEA GS-R-3, IAEA 50-C-Q 724,60 KB Download
Energietechnik Essen GmbH - TÜV NORD - AD 2000-Merkblatt W0 338,18 KB Download
Energietechnik Essen GmbH - TÜV NORD - KTA 3201.1, Item 2.4 289,86 KB Download
Energietechnik Essen GmbH - TÜV NORD - QAS for material manufacturer according to directive 2014/68/EU 342,40 KB Download
File nameFile size
Energietechnik Essen GmbH - DNV GL - ISO 14001 539,02 KB Download
Energietechnik Essen GmbH - DNV GL - ISO 45001 378,83 KB Download
Energietechnik Essen GmbH - DNV GL - ISO 50001 378,81 KB Download
Energietechnik Essen GmbH - DNV GL - ISO 9001 539,33 KB Download
File nameFile size
Energietechnik Essen GmbH - Cronidur® 30 176,81 KB Download
Energietechnik Essen GmbH – Cronidur® 30 – EN/CHIN 252,03 KB Download
Energietechnik Essen GmbH – Cronidur® 30 – FRZ 108,54 KB Download
Energietechnik Essen GmbH – Cronidur® 30 – RU 215,36 KB Download
Energietechnik Essen GmbH – P2000 318,16 KB Download
File nameFile size
Energietechnik Essen GmbH General Terms of Sale and Delivery 695,39 KB Download

Your contacts in Sales

Michael Sobiella

Head of Sales Retaining Rings of Energietechnik Essen GmbH

Julia Vogel

Team Manager Sales HNS of Energietechnik Essen GmbH

High-tech and innovation

Top expertise in rotor retaining rings

No one in the world can match our more than 100 years of experience in the production of rotor retaining rings - precision components that reliably withstand the centrifugal forces encountered in today's increasingly powerful generators, where the rotors regularly reach speeds of up to 3,600 rpm.

Specialist in extreme applications

Our CRONIDUR® 30 cold-working steels incorporate a unique combination of properties. In many cases, they are what make innovative, highly stressed applications in aerospace, mechanical engineering, medical, pharmaceutical and foodstuffs technology, and also in the production of high-quality consumer goods, at all possible.

Steel that delivers safety

Our precision-engineered special steels are in demand around the globe: for satellites hurtling through space, for Formula 1 race cars performing to their limits on the world's top circuits, in beverage filling plants and for the springs that give high-end watches their extreme timekeeping accuracy. These steels assure product resilience and are the driving force behind whole industries.

Our production facilities

Two remelting furnaces

We use a standard electroslag remelting furnace and a pressure electroslag remelting furnace to produce the materials needed for retaining rings, and also for numerous other high-nitrogen austenitic and martensitic special steels in a wide range of dimensions and for the most diverse applications. These two installations produce remelt ingots with weights extending from 1 to 30 tonnes and diameters from 400 to 1,000 mm.

Expanding press of approx. 2,300 millimeters

We use an expanding press that exerts a force of 60 MN for cold expansion of our retaining rings. This enables us to achieve diameters of up to 2,200 mm and height of up to 1,480 mm. Cold expansion is a special variant of strain hardening that assures the precise attainment of the specified ultimate mechanical strength in the P900 austenitic material used for this application.

Machining/ incl. wage work

Our retaining rings are turned on seventeen carousel lathes. Maximum item weight 16 tonnes, maximum diameter 3,070 mm. A centre lathe, band saws and other mechanised cutting equipment complete the machining facilities at Energietechnik Essen GmbH and extend the range of operations we can perform.

Heat treatment/ incl. wage work

Systematic heat treatment enables us to meet precisely our customers' requirements for optimum hardness and toughness of steel - soft and solution annealing, normalising, oil and/or water quenching and tempering.

Future-orientated for more than 200 years.

  • 1811

    Friedrich Krupp steel foundry established in Essen

  • 1984

    Merging of the Krupp and Klöckner forging divisions to form Schmiedewerke Krupp-Klöckner GmbH

  • 1988

    Merging of the forging activities of Krupp Stahl, Klöckner Stahl and Thyssen Stahl to form VSG

  • 1994

    VSG Energie- und Schmiedetechnik GmbH

  • 2003

    Energietechnik Essen GmbH is absorbed by Georgsmarienhütte Holding GmbH

Your management contacts

Christian Scholz

Managing Director of Energietechnik Essen GmbH

Jörg Schulze

Head of Sales of Energietechnik Essen GmbH

Carsten Hellwig

Head of Technology and Quality of Energietechnik Essen GmbH

Careers at GMH Gruppe

GMH Gruppe creates future perspectives in steel – not least of all for its around 7,000 employees. We are continuously searching for new talent and seasoned professionals to join our production, engineering, innovation and management teams.

Our values

For us at GMH Gruppe, responsibility, team spirit, transparency and trust are not just empty words, they are values that are lived out every day by our employees.

Learn more

Career opportunities

Whether you're just starting out on your career or are already a seasoned professional – GMH Gruppe offers a whole range of career opportunities. Check out our job portal for vacancies and other employment-related information.

To the GMH Gruppe job portal


Is it your personal vision to experience a whole range of different tasks and enjoy a great team spirit? Then take an apprenticeship or traineeship at GMH Gruppe and lay the foundations for a successful career with outstanding prospects.

Available apprenticeships/traineeships

Your contacts in Human Resources

Volker Mielke

Head of Human Resources of Energietechnik Essen GmbH

How to find us

We look forward to welcoming you. Find your best route to Energietechnik Essen GmbH here.

Plan your journey

Energietechnik Essen GmbH

Westendstr 15
45143 Essen

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Birgit Boegel

Assistant to the Management


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