Drawn-in drawing agent - 1.4301
This defect has arisen because there was a thick stearate layer on the rod wire surface in local places. This was drawn through the drawing die when drawing the wire to the bar and the rod wire became deformed abnormally at this area. The light undersize which has arisen in this place hasn't been removed completely after a light sharpening of the bar surface. The sticked drawing agent has now been solved out from the surface and the original pickled wire surface gets visible. Macroscopicly, in the range of defect, a light grain boundary attack is to see.
Rod wire 17,00 mm round - solution annealed , pickled , drawn , sharpened