Drawn-in scale - 1.2826
Before annealing the rod wire in a furnace with inert gas atmosphere the material becomes pickled mostly, to remove the scale arisen when rolling. An insufficient pickling leaves rest of scale on the surface. If the wire is then drawn, these rests of scale can be pressed-in in the material. It is the radiate of the surface to remove another possibility tinder in front of the ache in a line in front of the ache. Another method to remove scale before drawing is to shot blast the surface in a line before drawing. An inadequate removal of scale can lead to a mottled appearance of the surface. Little darker places are then visible on the drawn material.
Rod wire 13,00 mm round - pickled , spheroidised
following shot blast , drawn at 12,00 mm