Companhia Siderúrgica Nacional (CSN) (en: National Siderurgy Company) is the largest fully integrated steel producer in Brazil and one of the largest in Latin America in terms of crude steel production. Its main plant is loed in the city of Volta Redonda, in the state of Rio de current CEO is Benjamin Steinbruch. Companhia Siderúrgica Nacional's annual crude steel capacity and ...