Rockwell hardness test is one of the most popular material hardness testing methods. The hardness is measured using the depth of indentation produced by a force from a unique indenter. It only needs a small sample of the material, making the process faster. The Rockwell Hardness testing is ISO certified, making its results accurate.
How To Calculate Hardness Testing Using Rockwell
It involves applying the preliminary test force on the additional load to attain the total, then back to the preliminary test load. The preliminary test force is the ground-zero reference where the actual load is set. After some time (allowance for elasticity), remove the major load while holding the preliminary load in place. The difference between the 2 readings is the hardness test.
Varieties of Rockwell Hardness Testing Machines
- 200AR – 10-150kgf, manual, deadweight and analogue reading
- 200ACL – 10-187.5 kgf, closed-loop system, digital setting and analogue reading.
- 200DCL – 10-187.5 kgf, closed-loop system and full colour digital touch screen.
- 300U – 1-250kgf, closed-loop system and i-Touch system.
- 300XL – 1-250kgf, closed-loop system with i-Touch system and a 40mm working height.
- 250RS – 1-187.5kgf, automatic with a closed-loop with i-Touch system.
- 400RS – 1-187.5kgf, closed-loop system with i-Touch system, and a 400mm working height.
- 652RS – 1-187.5kgf, closed-loop with Impressions system and 650mm working height.
There is also 400RS-IMP and 651RS.
Other models include Nexus, Versus and Nemesis.