This British Standard specifies requirements for cobalt-chromiumtungsten-nickel-manganese heat‑resisting alloy supplied in the following forms.
a) Bars and extruded sections for machining: annealed, designation HR 40A.
b) Billets and bars for forging: hot or cold worked and subsequently machined or ground, designation HR 40B.
c) Forgings: annealed, designation HR 40C.