Ferrolegeringen (excl. ferromangaan, ferrosilicium, ferrosilicomangaan, ferrochroom, ferrosilicochroom, ferronikkel, ferromolybdeen, ferrowolfraam, ferrosilicowolfraam, ferro titanium, ferrosilicotitanium, ferrovanadium, ferroniobium, ferrofosfor en ferrosilicomagnesium)