Rolling fin - 1.6582

Treatment :  untreated
Magnification :  6,5 : 1
Etching medium :  
Sampling / Specification :  surface of rod wire
Testing result :

strong rolling fin on the surface

Treatment :  untreated
Magnification :  12,5 : 1
Etching medium :  
Sampling / Specification :  transverse
Testing result :

rolling fin 0,33 mm high

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