(U.S. Patent No. 4,006,011)
(UNS N19903)

Single Figures are Maximums
0.05 C, 0.50 Mn, 0.50 Si, 0.015 P, 0.015 S, 0.50 Cr, 0.20 Mo, 0.50 Cu, 38.00/40.00 Ni, 2.50/3.50 Cb and Ta, 1.25/1.75 Ti, 0.70/1.20 Al, 0.0075 B, 14.00/16.00 Co, Bal. Fe

High-strength, precipitation-hardenable superalloy exhibiting low coefficient of thermal expansion with high strength at temperatures to 1200°F (649°C). Has been used for gas turbine engine components and hot-work die applications. This alloy requires a protective coating if exposed to atmospheric conditions above 1000°F (538°C).

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