Eramet Marietta is proud to be one of only a few manganese alloy manufacturing facilities in the USA. We manufacture a variet ... y of manganese-based products including: Silicomanganese (2% Carbon), Ferromanganese (High Carbon, Medium Carbon, Low Carbon) & Manganese by-products (Manganese tetraoxide and slag). Manganese is used in everyday products such as bridges, guardrails, and stainless steel appliances. We are proud to have been a part of the Mid-Ohio Valley community for the past 60 years. read more