Shear cracks at a pressed part - 1.5513
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.
Rod wire 17,00 mm round - spheroidised