Groove defect by shelling at the roll - 1.7139
Treatment : untreated
Magnification : 50 : 1
Etching medium :
Sampling / Specification : transverse
Testing result :
groove defect 0,15 mm deep
scaled defect
Treatment : untreated
Magnification : 50 : 1
Etching medium : 3 % alcoholic nitric acid
Sampling / Specification : transverse
Testing result :
groove defect 0,15 mm deep
only weak decarburization at the defect