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GENERAL INFORMATION	12 Months Ended
GENERAL INFORMATION	Dec. 31, 2017
GENERAL INFORMATION
GENERAL INFORMATION	NOTE 1 - GENERAL INFORMATION Gerdau S.A. is a publicly traded corporation (sociedade anônima) with its corporate domicile in the city of Rio de Janeiro, Brazil. Gerdau S.A and subsidiaries (collectively referred to as the “Company”) is a leading producer of long steel in the Americas and one of the largest suppliers of special steel in the world. In Brazil, the Company also produces flat steel and iron ore, activities which expanded the product mix and made its operations even more competitive. The Company believes it is the largest recycler in Latin America and around the world it transforms each year millions of tons of scrap into steel, reinforcing its commitment to sustainable development of the regions where it operates. Gerdau is listed on the São Paulo, New York and Madrid stock exchanges. The Consolidated Financial Statements of Gerdau S.A and subsidiaries were approved by the Board of Directors on April 2, 2018.