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Hardness TESTING
Hardness TESTING


Ultrasound is used for the measuring of hardness or elastic material properties under loads by the ultrasonic contact-impedance (UCI) method, in which a rod-shaped resonator , one end holding an intentation body, is pressed against a test specimen with a given test force, so that the indentation body penetrates the specimen, and the resulting change of df in the frequency f of the resonator is measured. With a wide variety of UCI probes, a large number of test problems can be solved, especially at hard-to-get-to locations. The probe usually contains a Vickers diamond (136° pyramid) and due to conversion scales, the reading can be performed in HV, HB, HRC, HRB and HS.
~ hardening depth: This is another application for the use of ultrasonics in the field of hardness testing. The hardening depth of induction hardening components can be measured with the Ultrasonic backscattering method. Higher backscattered signals can be measured at the beginning of the base material, thus the applied time of flight measurement gives a result for hardening depth


Available upon request


  • no specimen preparation required (separation, grinding, embedding)
  • hardness value directly readable, no optical evaluation required (measurement of diagonals as in the optical methods)
  • quick (short test cycle) and cost-effective process (the relevant hardness testers are relatively inexpensive, as they do not need to be equipped with elaborate optical systems, such as those used in Brinell, Vickers and Knoop machines)
  • non-destructive testing; the test specimen can be used for other purposes


  • What is Non Destructive Testing?

    Non Destructive Testing is defined as a method used to investigate the integrity of an object, material or system, without impairing its future usefulness.

  • Why is NDT used ?

    It is used to determine the following: a) In place quality of Concrete b) Health of Concrete] c) Influence of Time d) Non-availability of old drawings related to the structure.

  • What is the Accuracy?

    The accuracy of the diameter measured increase with decrease in cover. It also depends upon the diameter of the bar. For example if the cover is 30 mm and bar diameter is 25 mm the accuracy is + 1 mm. This accuracy can improve if either of these parameters i.e. diameter or cover is reduced

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