* Petitioners include U.S. Steel and Vallourec * Traders says complaint will have impact on market * Importers say group filing is excessive By Silvia Antonioli and Allison Martell July 3 (Reuters) - A group of U.S. companies that produce specialty steel pipe used to drill for oil and gas has launched one of the biggest steel trade cases in years, asking the U.S. International Trade Commission to stem what they say is a flood of unfairly traded products from nine countries. If they succeed, the price of some high-margin steel products sold to the energy industry could rise, benefiting domestic producers like United...
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