Form:This specification covers a corrosion and heat resistant nickel alloy in the form of round@ square@ and flat wire 0.625 inch (15.88 mm) and under in nominal diameter of thickness.Aplication:Primarily for helical sprins for use at elevated temeratures.Direct precipitation hardening as in 3.3.2@ after colling@ produces optimum stress and low relaxation up to 700??(371??.Solution and precipitation heat treatment as in 3.3.3@ after coiling@ produces optimum resistance to relaxation combined with farily fine and uniform grain size for use in service at 1000?? 1300??(538?? 704??.