With hardness testing, the abrasion and pressure resistance of materials is tested. It furthermore allows testing of whether the hardness of a material changes when it undergoes heat treatment or when it is deformed in a cold state. The most well-known hardness test methods are the Brinell, Vickers, and Rockwell methods.
This procedure has been named after a Swedish engineer and is used with soft to medium-hard metals. It employs carbide balls with a diameter of 1 to 10 mm as penetrators. The Brinell hardness number is then determined with a formula according to the size of the deformation that took place during the hardness test.
The Vickers hardness test uses a diamond indenter, with its surfaces set at an angle of 136 degrees. When it is pressed into the material being investigated, it leaves behind an indentation with diagonals that can then be measured. Taking into account the force load, the results are then converted into a Vickers hardness value. This hardness test can be applied to even and smooth surfaces.
The Rockwell hardness test method employs a diamond cone (for hardened materials) or a carbide ball (e.g. for soft steel) with which even surfaces can be tested. Before the actual application of the inspection load, a preliminary test force is applied that is used as a reference for the actual inspection load – the major load. The major load is released after a few seconds, returning to only the preliminary load. The Rockwell hardness value is derived from the depth measurement before and after the actual inspection load.
Our metal hardness tester determines the above parameters, as well as the tensile strength in N/mm2 and is furthermore equipped with an internal data storage of up to 360000 points. It distinguishes itself with high measurement precision and can be connected directly to the PC via a USB cable.