The alloy is strengthened by a precipitation-hardening heat treatment made possible by additions of niobium and aluminum. In addition, the aluminum content provides excellent resistance to oxidation at high temperature.

The alloy’s density is 5% less than those of superalloys such as INCONEL alloy 718. The combination of low expansion, high strength and excellent resistance to oxidation makes the alloy especially useful for gas turbine and steam turbine components.

The low expansion enables closer control of clearances and tolerances for greater power output and fuel efficiency.

Table 1 - Limiting Chemical Composition*, %

Chromium……………………………………………………………. 2.5-3.5

Nickel ……………………………………………………………….26.0-30.0

Iron ……………………………………………………………………24.0-27.0

Niobium…………………………………………………………………2.5-3.5

Aluminum………………………………………………………………5.0-6.0

Cobalt………………………………………………………………Remainder

Boron……………………………………………………………..0.003-0.012

Carbon………………………………………………………………0.03 max.

Manganese………………………………………………………..0.50 max.

Silicon……………………………………………………………….0.50 max.

Phosphorus……………………………………………………..0.015 max.

Sulfur ……………………………………………………………….0.005 max

Titanium…………………………………………………………………0.1-0.4

Copper……………………………………………………………….0.50 max

Physical Properties

Table 2 - Physical Constants

Density, g/cm3…………………………………………………………..7.81

lb/in3………………………………………………………….0.282

Melting Range, °F ……………………………………………..2437-2565

°C …………………………………………….1336-1407

Specific Heat, Btu/lb•°F (77°F)……………………………………0.109

J/kg•°C (25°C)……………………………………….455