This document describes a patent application filed in 1954 for improvements to cobalt-iron-chromium alloys. The alloys contain 45-70% cobalt, 15-22% chromium, 2-6% tungsten and molybdenum each, and 1-6% niobium and/or tantalum. Adding larger amounts of carbon, manganese, and other strengthening elements improves the heat resistance of the alloys. The alloys are solution treated at 1150-1300°C and may be further improved with warm working at 500-900°C. Several example alloy compositions and their properties are provided.