Strong slag line - 1.3520
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. In this case the slag accumulation was existing in the core area. It is possible that the casting end got croped insufficient.
Steel bar 50,00 mm round - spheroidised