1. The investigation of the casting properties and manufacture of turbine vanes showed that it is possible to use investment casting for gas turbine vanes of the experimental alloys tested. 2. In alloys hardened with aluminum and titanium (alloys 1 and 2) the maximum short-term strength was retained to higher temperatures than for the alloys hardened with aluminum and niobium (alloy 3) or niobium alone (alloy 4). 3. All the alloys investigated had stable properties at 700–900°. More notable weakening of the alloys began at 900–950°. 4. For long-term operation the heat resistance is highest for alloys with aluminum and titanium as the main hardening elements (alloys 1 and 2), and lower for alloys hardened with aluminum and niobium (alloy 3) as compared with alloys in which the precipitation-hardening element is niobium alone (alloy 4). 5. Alloys 1 and 2 can be recommended for manufacturing, guide vanes operating at temperatures up to 950°, and alloys 3 and 4 for temperatures up to 850–900°.