Torn wire at the drawing - 1.7176
The rod wire was cold drawn and occasional material demolitions appeared in the drawing die. An examination at the metallographic specimen showed an unfavorable microstructure for the process of drawing. There was a mixture of bainite and martensite. Small and greater transverse cracks have appeared inside the material because of the bad cold formability of the martensitic structure and its high hardness. The load-bearing cross-cut has himself strong reduces and thereby it came to the demolitions.
Rod wire 16,00 mm round - untreated , pickled