heat resistance is the firmness of a material at increased temperatures. Materials with special heat resistance become within the range of the ceramic materials, the foundry industry or in the iron and steelmaking and/or. - processing, in addition, assigned in aviation and petrochemical industry. Usual alloying elements for the increase of the heat resistance of iron are cobalt (CO), molybdenum (Mo) and vanadium (V). Alloys, those with 90% of the fusing temperature still structurally loadable (high-temperature resistant) are call one superalloy.