* Petitioners include U.S. Steel and Vallourec * Traders says complaint will have impact on market * Importers say group filing is excessive By Silvia Antonioli LONDON, July 3 (Reuters) - A group of steel pipe makers in the United States has urged the U.S. International Trade Commission to consider imposing anti-dumping duties on what they say is a flood of unfairly traded products from nine countries. The petition, filed late on Tuesday on behalf of companies including U.S. Steel Corp, asked the commission to investigate...
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