Heat-resistant ferritic steel with 13% chromium content with the addition of Aluminum and resistance to 950C in air work. Material shows satisfactory resistance to reducing gases containing sulfur compounds below 850C. Due to the difficulties related to cold forming, molding should be performed at elevated temperatures of 100-350C with cross-sections up to 6mm. Higher distortions and thicknesses should be formed within the 700-850C temp. range.