Abstract: A precipitation strengthenable, nickel-cobalt-iron base alloy and articles made therefrom are disclosed. The alloy contains controlled amounts of silicon, nickel, cobalt, iron, chromium, niobium, titanium, and aluminum which are critically balanced to provide a unique combination of high strength, good ductility, and controlled thermal expansion, together with good thermal stability and good oxidation resistance up to about 1200.degree. F. or higher.

Abstract: A heat resisting, controlled thermal expansion, nickel-iron base alloy consisting essentially of, in weight percent, about:______________________________________ C 0.1 max. Mn 0.5 max. a small but effective amount up to Si 0.7 P 0.015 max. S 0.010 max. Cr 0.8 max. Ni 32-52 Mo 0.5 max. Co 0-20 Ti 1-3 Al 0.2 max. Nb 5-7 V 0.5 max. Zr 0.1 max. B 0-0.02 Cu 0.8 max. W 0.5 max. Fe Bal. ______________________________________and an article formed therefrom are disclosed. The alloy provides an outstanding combination of elevated temperature tensile properties and notch rupture ductility by close control of the niobium and titanium in the alloy. Within the compositional range of the alloy niobium and titanium are balanced such that(a) % Nb.gtoreq.6.7-0.5(% Ti), for Ti.ltoreq.1.5%;(b) % Nb.gtoreq.18.3-8.2(% Ti), for Ti.gtoreq.1.5%; and(c) % Ti.ltoreq.0.67(% Nb-1.3). Furthermore, the sum, % Mn+% Cr+% Mo+% V+% Cu+% W.ltoreq.2.

Abstract: This invention provides a process for improving, to at least a predetermined level, the stress rupture life and/or stress rupture ductility of precipitation hardenable nickel and nickel-iron base alloys containing nickel, niobium, and silicon when said alloys have less than a predetermined level of these stress rupture properties when worked and aged by a primary heat treatment. This improvement in properties is accomplished by controlled precipitation of a sufficient quantity of a (Ni, Nb, Si)-containing intermetallic phase.

Abstract: A heat, corrosion and wear resistant austenitic steel and article made therefrom is disclosed containing in weight percent about______________________________________ w/o ______________________________________ Carbon 0.35-1.50 Manganese 3.0-10.0 Silicon 2.0 max. Phosphorus 0.10 max. Sulfur 0.05 max. Chromium 18-28 Nickel 3.0-10.0 Molybdenum Up to 10.0 Vanadium Up to 4.0 Boron Up to 0.03 Nitrogen 0.25 min. Tungsten Up to 8.0 Niobium 1.0 max. ______________________________________the balance being essentially iron. To attain the unique combination of properties provided by the present alloy w/o C+w/o N must be at least about 0.7, w/o V+0.5 (w/o Mo)+0.25 (w/o W) must be about 0.8-9.0.

Abstract: A heat, corrosion and wear resistant austenitic steel and article made therefrom is disclosed containing in weight percent about______________________________________ w/o ______________________________________ Carbon 0.35-1.50 Manganese 3.0-10.0 Silicon 2.0 max. Phosphorus 0.10 max. Sulfur 0.05 max. Chromium 18-28 Nickel 3.0-10.0 Molybdenum Up to 10.0 Vanadium Up to 4.0 Boron Up to 0.03 Nitrogen 0.25 min. Tungsten Up to 8.0 Niobium 1.0 max. ______________________________________the balance being essentially iron. To attain the unique combination of properties provided by the present alloy w/o C+w/o N must be at least about 0.7, w/o V+0.5 (w/o Mo)+0.25 (w/o W) must be about 0.8-9.0.