Ferro-alliages
Ferro-manganèse ; C > 2 %
Ferro-manganèse ; C <= 2%
Ferro-silicium ; silicium > 55%
Ferro-silicium ; silicium <= 55%
Ferro-silico-manganèse
Ferro-chrome; C > 4 %
Ferro-chrome; C <= 4%
Ferro-silico-chrome