Surface cracks at the drawing - 1.4301

 

The wire material was drawn in several steps from 8,00 mm to 3,00 mm. Between the individual drawing events a solution annealing was carried out. The first transverse cracks then probably have appeared on the material surface at one of the last drawing steps due to material overload. An available drawing agent in the bursts then has led to the local carburized areas by the following solution annealing. The surface has completely burst at the last drawing step and has then looked scaly.

Rod wire 8,00 mm round - solution annealed , pickled
following drawn at 3,00 mm

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