Hardness conversions between different scales
There are several hardness scale conversion systems, including BS 860 and ASTM E140.
The table shows a set of values that has been used for stainless steels and also includes a tensile strength (UTS) comparison. The Rockwell B values are superimposed on this table using an approximation from ASTM E140 Table5, which compares Rockwell B and Brinell.
Comparison tables should only be used as a guide. The figures shown are not equivalents and Righton Blackburns accepts no responsibility of the accuracy of the data. In any case of doubt or dispute values using the actual test methods should be used rather than converted table values.