Northwest Pipe Co. on Monday said it has sold its "oil country tubular goods" assets to Centric Pipe LLC, an affiliate of Dallas, Texas-based industry supplier SB International Inc., for $42.7 million. Vancouver, Wash.-based Northwest Pipe makes large-diameter pipes for industrial applications. The division served the oil and gas markets in Texas. "After reviewing a full range of alternatives for our OCTG business, we determined that a sale to Centric Pipe provided the best outcome for the company,…