This specification covers three grades of ferrocolumbium, designated low-alloy steel grade, alloy and stainless steel grade, and high-purity grade. The material shall conform to the requirements as to chemical composition. Also, the ferrocolumbium shall be available in the sizes and tolerances specified.

1.1 This specification covers three grades of Ferrocolumbium (ferroniobium), designated Low-Alloy Steel Grade, Alloy and Stainless Steel Grade, and High-Purity Grade.

1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.