It is the most generally useful cobalt alloy, having excellent resistance to manyforms of mechanical and chemical degradation over a wide temperature range.Particular attributes are its outstanding self-mated anti-galling properties, whichresult in its wide use as a valve seat material, high temperature hardness, anda high resistance to cavitation erosion. The alloy is ideally suited to a variety ofhard facing processes. Hardness : 40 Rockwell "C"