Applicable Scenarios for Different Rockwell Hardness Scales?

Different scales of the Rockwell hardness tester have their respective applicable scenarios.
The HRA scale adopts a diamond cone indenter, with an initial test force of 98.07N and a main test force of 588.4N, and is suitable for testing high-hardness materials such as cemented carbide and surface-hardened steel. These materials have high hardness and require a larger test force to enable the indenter to produce measurable indentations; the HRA scale can accurately reflect their hardness characteristics.
The HRB scale uses a steel ball indenter with a diameter of 1.5875mm, an initial test force of 98.07N, and a main test force of 882.6N, and is commonly used for testing softer materials such as annealed steel, non-ferrous metals (copper, aluminum, etc.), and their alloys. These materials have lower hardness; the smaller test force and steel ball indenter can avoid excessive indentation depth that damages the specimen, while accurately measuring its hardness.
The HRC scale also adopts a diamond cone indenter, with an initial test force of 98.07N and a main test force of 1471N, and is one of the most commonly applied scales, mainly used for testing medium-hardness materials such as quenched steel and tempered steel, which can meet the hardness testing needs of most metallic materials.

Kunshan Fuze Testing Equipment Co., Ltd. can provide users with detailed introductions to the applicable scenarios of each scale to help users make the correct choice.