Examinations at the material 1.7076
Treatment : 30 min. 780°
C / oil + tempered
Magnification : 100 : 1
Etching medium : 3 % alcoholic nitric acid
Sampling / Specification : longitudinal
Testing result :
core area
heat treated structure with ca. 25 % ferrite
hardness : 215 HV 10
Treatment : 30 min. 780° C / oil +
tempered
Magnification : 200 : 1
Etching medium : 3 % alcoholic nitric acid
Sampling / Specification : longitudinal
Testing result :
core area
heat treated structure with ca. 25 % ferrite
surface area was a little better , ca. 10 % ferrite