Alacrite
Family of Cobalt based alloys / From Wikipedia, the free encyclopedia
Alacrite (also known as Alloy L-605, Cobalt L-605, Haynes 25, and occasionally F90[1][2][3]) is a family of cobalt-based alloys. The alloy exhibits useful mechanical properties and is oxidation- and sulfidation-resistant.[2]
One member of the family, XSH Alacrite,[4] is described as "a non-magnetic, stainless super-alloy whose high surface hardness enables one to achieve a mirror quality polish."[5] The Institut National de Métrologie in France has also used the material as a kilogram mass standard.[5][6]