Sharpened slag line - 1.8519
Non metallic inclusions (slags), branch-on through the casting process, can occur in the steel. If slag is washed in larger quantity into the steel by an irregularity during the cast, these non metallic inclusions in the material can be existing as long lines, after rolling the pre-material. The size of this slag line is dependent on the slag amount in the pre-material and on the reforming of the rolled piece. These slag lines can be cut, if the surface of rod wire or steel bar is worked on, by cutting or by grinding. The slag lines then come to the surface and a dark line is seen on the surface of the material.
Rod wire 22,00 mm round - quenched and tempered , drawn , sharpened