Heat Treatment of Steel 1.1730 with Concentrated Solar Energy

This paper presents and discusses research conducted with the purpose of developing the use of solar energy in the heat treatment of steels. For this, a vertical axis solar furnace called at Plataforma Solar de Almeria was adapted such as to allow control of the heating and cooling processes of samples made from1.1730 steel. Thus temperature variation in pre-set points of the heated samples could be monitored incorrelation with the working parameters: the level of solar radiation and implicitly the energy used theconditions of sample exposed to solar radiation, and the various protections and cooling mediums.Therecorded data allowed establishing the types of treatments applied for certain working conditions. Thedistribution of hardness, as the representative feature resulting from heat treatment, was analysed on allsides of the treated samples. In correlation with the time-temperature-transformation diagram of 1.1730steel, the measured values confirmed the possibility of using solar energy in all types of heat treatmentapplied to this steel. In parallel the efficiency of using solar energy was analysed in comparison to the energyobtained by burning methane gas for the heat treatment for the same set of samples. The analysis consideredenergy consumption, productivity and the impact on the environment. Thanks to various data obtainedthrough developed experiences, which cover a wide range of thermic treatments applied steels 1.1730model, we can certainly state that this can be a solid base in using solar energy in applications of thermictreatment at a high industrial level.