Production that meets the highest standards

Our production plants

Energietechnik Essen GmbH’s production plants make steel that needs to guarantee absolute safety. Thanks to our modern plants and continuous investment, we are able to ensure maximum quality and keep our processes efficient.


Two remelting units

We use one electro-slag remelting unit and one pressure electro-slag remelting unit to produce materials for retaining rings, as well as other high-nitrogen-alloyed, austenitic and ferritic-martensitic special steels for a wide range of dimensions and applications.  These two units manufacture remelt ingots with weights of 1 to 30 tonnes and diameters of 400 to 1,000 millimetres – using continuously monitored and controlled processes.

60 MN expansion press

For the cold expansion of our retaining rings, we use an expansion press with 60 MN (meganewtons) of pressing force. This allows us to achieve diameters of up to 2,200 millimetres and heights of up to 1,480 millimetres. Cold expansion is a special form of strain hardening that enables us to make the austenitic material P900 to the required final strength.


We use 17 carousel lathes to cut our retaining rings. The heaviest workpiece weight is 16 tonnes, and the maximum diameter is 3,070 millimetres. A centre lathe, several band saws and a number of cutting machines complete our facilities at Energietechnik Essen GmbH and supplement the range of services we offer.

Heat treatment

We use specialised heat treatment to optimise the hardness and resilience of our steel in accordance with our customers’ requirements. We make use of all the options this process offers us, from soft and solution annealing to normalising and oil and water quenching.