The three companies hope to start the 280m real ($68.2m) venture in April in Pindamonhangaba, São Paulo, pending approval from the antitrust regulator.
Porto Alegre-based Gerdau will likely take at least a 50% stake in the venture, dubbed Gerdau Summit.
It will supply equipment to make special steel for wind turbine towers, including main shafts and bearing rings.
Total output of wind-related components and of rolling mill rolls is expected to reach 50,000 tonnes per year.
The
