Specifies a corrosion and heat resistant steel in the form of sand castings. Mainly for parts, such as nozzle diaphragm vanes, needing both corrosion and heat resistance and which may be welded during fabrication. The steel is oxidation resistant up to 2000 Deg F (1095 Deg C) but is useful at the higher temperatures only when stresses are very low. At elevated temperatures, strength is similar to that of the 18 Cr - 8 Ni types.