Brazil’s government will launch an investigation into suspected export "dumping" of some hot-rolled steel products from China, India and Indonesia, its official gazette said on Monday.Preliminary studies have found the sufficient evidence of dumping as well as resulting damage to its domestic steel industry, the document said. Steelmakers in Latin America’s largest economy have long complained of an unfair playing field, saying that China floods the market with cheap material and calling on the government to do more to control those imports.