Material number 1.2311
Treatment : spheroidised
Magnification : 200 : 1
Etching medium : 3 % alcoholic nitric acid
Sampling / Specification : transverse
Testing result :
weak surface decarburization 0,11 mm deep
Treatment : spheroidised
Magnification : 100 : 1
Etching medium : 3 % alcoholic nitric acid
Sampling / Specification : transverse
Testing result :
stress crack 0,31 mm deep
the crack is emerged at the cooling after the hot forming
of the rod wire