Hot rolling is performed on a steel with a predetermined composition containing Ti: 0. The intermediate erase step is comprised of an erase pulse voltage, applied to the semiconductor well of the selected memory block of memory cells, while edge rows of memory cells are biased at a low positive voltage. In a preferred embodiment, the first probe has two nozzles, both oriented perpendicular to the longitudinal axis, and offset 180 degrees from each other. Therefore, the object is a self-defining object.