Sticked flaky things, which are in places on the surface,
are described as scab. They usually only have connection to the basic material
in a place. Scabs can appear as a pre-material defect of the billet or block or
they can arise from local pincher at the hot forming. In most cases a metallographic
specimen examination can give information about the origin of the scabs. In this
case it is defects of the pre-material. At the microsections non metallic oxide
slags and an anomaly of the sulfides were stated in the environment of the scabs.
15,00 mm round - solution annealed