Vickers Hardness Testing

A Vickers hardness number is obtained by dividing the applied load (in kilograms force, kgf) by the surface area of the indentation (in square millimeters, mm2), which is computed from the mean of the measured diagonals of the indentation; the two diagonals of the indentation are measured to within 4% or 0.25um, whichever is greater.

This type of hardness is very usefull for doing weld profiles and determination of hardness in Heat Affected Zones (HAZ). There are several specifications which call out the use of this type of hardness method. The testing method which governs the marco hardness Vickers is ASTM-E-92.

Other specifications which refence the use of Vickers hardness testing are:

  • API 5L
  • ASME Section IX
  • AWS D1.1
  • NACE MR0175
  • ISO 15156-2