TerniEnergia recovers and sells harmonic steel from the recovery of used tires. The high purity of the material, resulting from mechanical treatment is able to contain the rubber contamination below 1%, and  facilitates direct reuse in the foundry.

The harmonic steel of TerniEnergia, thin material and filaments (maximum 10 mm) with a high content of carbon, is used as a correction or replacement in the smelting process, or as acceleration  mean for fusion process.