Their nominal dimensions were 6mm
(diameter)×50mm (height).
Samples were ground using 500mesh sandpaper before the
treatment and 200, 400, 600, 800, 1000 and 1200 mesh sandpapers
respectively and polished using 3m diamond paste before etching
in 2% Nital solution after the treatment. Cross sections of the
boronized steels were examined using a JEOL JSM-6060 LV brand
scanning electron microscope.