Rest of scale after the grinding - 1.4305
Because of unfavorable parameter during the solution annealing, too high temperature or too long holding time, strong scale layers can be formed. This scale layer is partly accompanied by stronger formation of scars. Unless by wrongly selected annealing parameters, a furnace disturbance yields the same defect picture. If such handicapped material is then processed to ground bars, rests of these scaled scars can remain on the surface. This defect appears if the allowance for the grinding is smaller than the defect depth at the pre-material.
Rod wire 12,00 mm round - solution annealed , ground