How to convert Richter hardness HL to Brinell hardness HB?

There is no universal and accurate formula for converting Richter hardness HL to Brinell hardness HB, as the principles and application ranges of these two hardness testing methods differ. However, to meet engineering requirements, approximate conversions can usually be made by relying on empirical formulas or conversion charts. One of the commonly used empirical conversion formulas is: \ However, it should be noted that this formula can only provide an approximate value, and its applicability is limited; it is mainly suitable for materials of moderate hardness. For materials that are either very soft or very hard, the error will be relatively large. If a more precise conversion is required, it is best to consult specific hardness conversion tables or use conversion methods provided by authoritative organizations such as the International Organization for Standardization (ISO) or the American Society for Testing and Materials (ASTM). .

Check GB 17394.