Form This specification covers a heat-resistant iron-nickel alloy in the form of bars@ wire@ forgings@ flash welded rings 8.0 inches (203 mm) and under in nominal diameter or least distance between parallel sides@ and stock of any size for forging or flash welded rings (see 8.5). Application These products have been used typically for low-stressed parts requiring oxidation resistance up to 2100 ??(1149 ??@ particularly where such parts may require welding during fabrication@ but usage is not limited to such applications.