High strength low thermal expansion alloy

摘要

The alloy of the invention provides a low coefficient of thermal expansion alloy having a CTE of about 4.9x10-6 m/m/ DEG C. or less at 204 DEG C. and a relatively high strength. The alloy contains about 40.5 to about 48 nickel, about 2 to about 3.7 niobium, about 0.75 to about 2 titanium, about 0 to about 1 aluminum, about 3.7 or less total niobium plus tantalum and a balance of iron and incidental impurities. Alloys of the invention may be aged to a Rockwell C hardness of at least about 30.