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ERW Welded Carbon Steel Pipe ASTM A53 A36 Grade B Factory Direct Q235B Q345b Welded Round Steel Tube for Construction Structure, Find Details and Price about Carbon Steel Pipe Steel Pipe from ERW Welded Carbon Steel Pipe ASTM A53 A36 Grade B Factory Direct Q235B Q345b Welded Round Steel Tube for Construction Structure - Tianjin Lixin Technology Co., Ltd.