Induction heating machines for steel

Our induction heating machines are ideally suited to the entire metallurgical process chain – from the initial planning of a new machine to extensions and upgrades. Along with offering standardised products and solutions for all types of facilities, we develop special solutions adapted to your facilities. In all of this, the primary focus is on the heating task, and the solution can be individually adapted to your requirements.

Hybrid designs incorporating induction heating

Along with pure induction heating machines, we cooperate with other companies in the SMS Group to supply hybrid designs incorporating induction heating.

Induction heating offers you advantages in all situations where high power density is required in a limited space, precise dosing is necessary, or a flexible set-up is desired. Moreover, induced energy can be concentrated very well and applied to localised areas of workpieces. As a result, it is often possible to dramatically reduce the total power and achieve high efficiency.

Conventional heating concepts can optimally complement induction technology in areas where, for example, soaking or equalisation is necessary. With the addition of induction technology, conventional furnace concepts can be implemented in half the usual space.


energy efficiency

High power density

Targeted power input

precisely configurable process parameters


Induction methods

In the induction heating process, the metal workpiece is exposed to an alternating electromagnetic field generated by a current-carrying coil. This non-contact process produces eddy currents in the material, which in turn produce heat. This process can be influenced in a controlled manner. Depending on the frequency and the amount of induced energy, specific temperature profiles can be generated in the material that are advantageous for further process steps in terms of energy and distribution.

Whether this involves the most uniform possible heating of the material or targeted reheating depends on the downstream process chain.

In combination with a subsequent quenching operation, induction technology can also be used to achieve specific microstructure properties. For example, mechanical properties can be distinctly improved by induction tempering of the material.

Precise surface hardening according to customer requirements is also possible for geometries ranging from simple to complex.

Induction heating process for steel heating


Metallurgical processes for steel heating

Metallurgical processes

Due to their technical advantages, induction heating technologies from SMS Elotherm are being used more and more in the metallurgical process chain, especially for the production of steel and stainless steel products. With these technologies, production operations can be made more economical, more productive and more environmentally-friendly, thanks to precisely configurable process parameters for very high productivity.

The portfolio of SMS Elotherm in the area of metallurgical induction solutions extends from billets to slabs and strip treatment. One of the greatest advantages for customers is the total competence of SMS Elotherm together with the SMS Group for harmonised and stable processes.

With resources becoming increasingly scarce, energy-intensive processes such as the production of steel products are receiving more and more attention. Where operations were previously carried out separately, such as casting followed by rolling of long or flat products, the new possibilities of coupled process chains are now coming to the fore.

Why should billets that are still hot first be left to cool down and later reheated in a large furnace so they can be rolled, at the cost of immense amounts of primary energy? With new plants, the layout can be directly arranged to allow immediate further processing with the available residual heat.

Variations in thermal process control or any necessary reheating can be handled very elegantly using induction technology. The necessary installation space is minimal – for example, with the EloHeat Long series, 9000 kW can be implemented in a length of just 8 metres – and so is the required additional energy. With suitably matched components, it is possible to process billets from continuous casting to round steer bars with 8 to 32 mm diameter using reheat energy of just 24 kWh per tonne. This sort of reheating naturally has spare capacity to handle variations in the process, so that an adequate temperature level can be attained even with relatively low infeed temperatures. Generator capacities of 6 to 18 MW are common here. It should also be borne in mind that the yield of these machines is 100 to 200 t/h.


SMS Elotherm offers modular product lines for hardening machines. Modular systems can be economically tailored and adapted to implement flexible hardening systems. Workpiece-specific systems that fulfil all customer requirements can be assembled from individual modules. This allows comprehensive solutions to be implemented for all commonly used workpieces. New workpieces and requirements can be integrated at any time.

In the hardening machines from SMS Elotherm, EloProcess integrated effective power measurement enables precisely targeted quality control of hardened workpieces. This largely eliminates the need for complicated inspections, for example on cut bearing segments.

Induktives Härten