Compléter SiderurgyVersion en ligne The siderurgy process par Aitor Zaballa 1 most structure siderurgy compositions zinc used steel iron carbon Steel ? is an essential part of our everyday life . ? It takes part of the of the buildings where we work and live , the home appliances that we use , ? ? the cars that we drive , bridges , boats , planes , trains etc . without it , modern day life would look a lot different . ? Last year the world steel produced eighteen hundred million tons of steel , ? the equivalent of over 5100 building's . So how is possible to ? transform ? rocks in the ground into one of the structural materials in the world . The steel making process starts with the processing of rocks that have been extracted from a mine containing . These rocks are crushed ( trituradas ) and ore iron is extracted using magnetic media . This iron ore is mixed with and melted in a big furnace ( HORNO DE FUNDICIÓN ) . The melted steel will be treated in different ways to obtain ingots , sheets or bars . Often additives are added to the melted steel like chromium , or titanium to obtain different alloys of the steel with different .