Compared to other methods of hardness testing, the Rockwell test is typically quicker and more precise. All metals can be tested using the Rockwell method, with the exception of those where excessive variation would be introduced by the test metal’s structure or surface conditions, where the indentations would be too large for the application, or where the sample size or sample shape would prevent its use.

The permanent depth of an indentation caused by a force or load on an indenter is measured using the Rockwell method. A sample is first subjected to a preliminary test force using a diamond or ball indenter, often known as a preload or mild load. In order to lessen the impacts of surface polish, this preload penetrates the surface. The baseline depth of indentation is measured following the holding of the preliminary test force for a predetermined dwell time.

From 3 kgf (used in the “Superficial” Rockwell scale) to 10 kgf (used in the “Regular” Rockwell scale), preliminary test loads (preloads) are available. Test forces totalling 15 kgf to 150 kgf (superficial and regular), as well as 500 to 3000 kgf, are used (macrohardness).

NextGen’s Ultrasonic Contact Impedance Hardness Tester – UH200 loading force is 5kgf manual probe (optional 1/2/10kgf manual probe)

(optional motorized probe: 0.3/0.5/0.8/1kgf).

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