Classification of hardness

The measurement of hardness is mainly divided into three types: Brinell Hardness, Rockwell Hardness, and Vickers Hardness. Each hardness measurement method has its specific areas of application and characteristics. 1. **Brinell Hardness (HB):** It is commonly used to measure larger, rougher samples such as cast iron, aluminum, copper, etc. The measurement method involves pressing a cemented carbide ball of a certain diameter onto the surface of the material under test with a specific load, then measuring the diameter of the indentation, and using a formula to calculate the hardness value. 2. **Rockwell Hardness (HR):** This is the most commonly used method for measuring hardness, and it can be applied to both metals and non-metals. The main advantage of the Rockwell hardness test is that no complex calculations are required; the hardness value can be read directly, and the indentation is small, resulting in minimal damage to the sample. 3. **Vickers Hardness (HV):** The Vickers hardness test is suitable for measuring the hardness of all metals and ceramics, especially for materials that are extremely hard or extremely soft, such as steel, cast iron, aluminum, copper, etc. The advantages of the Vickers hardness test are its high accuracy and wide measurement range; regardless of the material’s hardness level, only one hardness standard is required. All of the above hardness testing standards have corresponding international and domestic standards. In practical applications, it is necessary to select an appropriate hardness measurement method based on the type and hardness range of the material, as well as the required measurement accuracy. .