Rolling fin - 1.2381
Treatment : spheroidised
Magnification : 6,5 : 1
Etching medium :
Sampling / Specification : surface of rod wire
Testing result :
strong rolling fin on the surface
Treatment : spheroidised
Magnification : 12,5 : 1
Etching medium : 3 % alcoholic nitric acid
Sampling / Specification : transverse
Testing result :
rolling fin 0,60 mm high