Scab out of foreign material - 1.4305

 

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 a defect of the pre-material. At the microsections a different austenitic material was found in the scab. The scab didn't show any sulfides, as it is distinctive for the material 1.4305.

Rod wire 21,00 mm round - solution annealed , pickled

Back to material defects

 

Pictures