Burst of Screw head at the compression - 1.7034
Treatment : quenched and tempered
Magnification : 6,5 : 1
Etching medium :
Sampling / Specification : surface - head burst
Testing result :
light burst in the area of the upseted
screw head
Treatment : quenched and tempered
Magnification : 200 : 1
Etching medium :
Sampling / Specification : transverse
Testing result :
small rolling defect 0,09 mm deep as the cause of
the defect