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.
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.Plan your journey
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|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|
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|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|
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|Energietechnik Essen GmbH General Terms of Sale and Delivery||695,39 KB||Download|
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High-tech and innovation
Top expertise in rotor retaining rings
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
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.
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.
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.
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.
Friedrich Krupp steel foundry established in Essen
Merging of the Krupp and Klöckner forging divisions to form Schmiedewerke Krupp-Klöckner GmbH
Merging of the forging activities of Krupp Stahl, Klöckner Stahl and Thyssen Stahl to form VSG
VSG Energie- und Schmiedetechnik GmbH
Energietechnik Essen GmbH is absorbed by Georgsmarienhütte Holding GmbH
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How to find us
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Energietechnik Essen GmbH