This experiment was carried out at room temperature. The power source was on for 30 min and the voltage applied was 27 V, which in this case, resulted in 6.5 A. After 30 min, the temperature of the sample was measured by using a thermo- couple. The temperature of the sample was about 200 ◦ C. Other than that, neither change in the color of sample nor the wire was observed despite the heating. The voltage applied cause a much lower increase in the temperature of the sample than the temperature of the heat treatment. Some later heat treatments were carried out at 950 C for 150 min and at 1050 ◦ C for 30 and 180 min to compare the effect of temperature and period of time of heat treatment on the hardness and on the microstructure of steels studied. The results of AISI 1020 steel hardness after heat treatments are displayed in Table 4. The hardness of the sample of AISI 1020 steel heat-treated at 950 ◦ C for 150 min was about the same as measured in the sample heat-treated at 750 ◦ C to which to voltage was applied. Nevertheless, the heat treatments carried out at higher temperatures showed dissimilar results. The hardness of the sample heat-treated at 1050 ◦ C for 30 min was considered high, although lower than the hardness measured in the samples heat-treated at 750 ◦ C to which the voltage was applied. The sample heat-treated at 1050 ◦ C for 180 min showed much lower hardness than the sample heat-treated at 1050 ◦ C for 30 min. The steel decarburization is the explanation for the lowest hardness of the sample heat-treated at 1050 ◦ C for 180 min. The loss in carbon caused a drop in hardness. The results of AISI 52100 steel hardness after heat treatments are displayed in Table 5. The hardness of the samples heat- treated at 1050 ◦ C for 30 min and at 950 ◦ C for 150 min was the same and was considered high, although lower than the hardness measured in the samples heat-treated at 750 ◦ C to which the voltage was applied. The sample heat-treated at 1050 ◦ C for 180 min showed lower hardness than the samples heat-treated at 1050 ◦ C for 30 min, at 950 ◦ C for 150 min and at 750 ◦ C to which the voltage were applied. The steel decarburization is the explanation for the lowest hardness of the sample heat-treated at 1050 ◦ C for 180 min. The loss in carbon caused a drop in hardness in the sample heat-treated for longer periods of time and at higher temperatures