Composition (Nominal)
0.10 C, 0.35 Mn, 0.35 Si, 0.015 P, 0.015 S, 17.00/21.00 Cr, 50.00/55.00 Ni+Co, 2.80/3.30 Mo, 4.75/5.50 Cb+Ta, 0.65/1.15 Ti, 0.35/0.85 Al, 0.001/0.006 B, 0.15 Cu, Bal. Fe
The Cobalt content is on an "If determined" basis.
A precipitation-hardened, nickel-base alloy that offers exceptionally high yield, tensile and creep-rupture properties up to 1300°F (704°C). Has been used for jet engine and high-speed airframe parts such as wheels, buckets, and spacers, and high temperature bolts and fasteners.
Specifications: API 6A718, NACE MR0175, AMS 5662, AMS 5663