It can come to bursts at the wire surface of cold upsetting
steels by the compressing to screws or tools. The strength of the bursts is dependent
from the degree of the cold forming, the size of the existing defects and possible
anomalies of the structure. Too bad spheroidised microstructure was the reason
for the processing problems in this case. Shear cracks arise from unfavorable flow
properties of material with a too low spheroidization degree.
17,00 mm round - spheroidised