Historically, this was the standard form in which manganese was traded and used in steel making (see Bessemer process); today, manganese is usually traded and used in more concentrated form, 80% manganese content being typical.
This was the standard form in which manganese was traded and used in steel (see Bessemer process). This was historically. This steel was making (see Bessemer process). Today, manganese is usually traded and used in more concentrated form manganese content. This was 80%. Today, manganese was being typical.