This specification covers standards for ferromanganese (Grades A, B, and C), medium-carbon ferromanganese (Grades A, B, C, D, and nitrided) and low-carbon ferromanganese (Grades A and B). The ferroalloys shall conform to manganese, carbon, silicon, phosphorus, sulfur, and nitrogen contents specific to different material grades. Materials shall also adhere to content limits of arsenic, tin, lead and chromium. The material shall be available in standard sizes, tolerances, and friability ratings.

1.1 This specification covers ten grades of ferromanganese, designated as follows:

Standard ferromanganese

Grade A

Grade B

Grade C

Medium-carbon ferromanganese

Grades A,B,C, and D

Nitrided

Low-carbon ferromanganese

Grade A

Grade B

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.