Burst of Screw head at the compression - 1.7076
Treatment : quenched and tempered
Magnification : 6,5 : 1
Etching medium :
Sampling / Specification : surface - head burst
Testing result :
strong burst in the area of the upseted
screw head
Treatment : quenched and tempered
Magnification : 100 : 1
Etching medium :
Sampling / Specification : transverse
Testing result :
rolling defect 0,23 mm deep with small slag
in the crack course as the cause of the defect