ROCKWELL SUPERFICIAL HARDNESS SCALES Empty Cell Empty CellPreliminary Test ForceTotal Test Force ScalePenetratorkgfNkgfkN 15-N Diamond cone 3 29.4 15 0.14 30-N Diamond cone 3 29.4 30 0.29 45-N Diamond cone 3 29.4 45 0.44 15-T 116 in (1.588 mm) steel ball 3 29.4 15 0.14 30-T 116 in...