This table clearly shows the difference
in the full densities between high speed
steel and the high-chromium materials
that should be considered when reviewing
apparent density and compressibility figures.
Annealed hardness of the OB1 has
been measured directly using Hv10 but to
make an annealed hardness comparison
this has been converted to HB using tabulated
conversions for comparison with the
mid point of the usual anneal hardness
taken from the literature.