本规范涵盖棒材、棒材和挤压件形式的铌（铌）合金。这种材料通常用于需要暴露在超高温下的零件，但使用不限于此类应用。在氧化性环境中的应用需要一层保护涂层。

This specification covers a columbium (niobium) alloy in the form of bars, rods, and extrusions.This material has been used typically for parts requiring exposure at ultra-high temperatures, but usage is not limited to such applications. Applications in oxidizing atmospheres necessitate a protective coating.