2.0855 is the Werkstoff number for the copper-nickel alloy most commonly known as Hidurel® 5. Werkstoff numbers were developed by the German standards body DIN; the word translates roughly as "material".
Hidurel® 5 is a high-strength copper-nickel alloy with a significant silicon addition, which we developed for bearing applications. It has high electrical and thermal conductivity with very good notch ductility and high mechanical strength, and despite that strength it resists hydrogen embrittlement. Corrosion resistance under marine and industrial conditions is excellent, and the alloy has good anti-frictional and bearing properties. With a magnetic permeability of less than 1.001, it is essentially non-magnetic.
Hidurel® 5 meets the mechanical and chemical properties of DTD 498, BS 4577 Type A3/2 and Rolls Royce MSRR 8501, to which we can supply, so it can be specified with confidence for high-integrity components. Cold-worked material to DTD 504 can also be supplied to order. It also fits the caption of UNS C64700.