In this group, the energy to cut the sheets of DP750, GXE450B and ZStE260 + ZE is higher. This result was expected, since these sheets are thicker than the previous ones. Fig. 5 shows how at the same cutting speed, in comparison to the previous case, a higher power is required. All tests have been carried out using O2 as assisting gas at a constant pressure of 4 bars. Focal point positions have been maintained below the sheet surface (+1.5 to +1.75 mm).