... tubeWe are Tianjin BoReiXiang Steel Pipe Sales Co., Ltd.-----American Petroleum Institute:Certificate of Authority to ... China, we sincerely hope to establish businessrelations with your esteemed ,corporation,. We have good cooperation with Chengdu Steel Group Co., Ltd ... ., Baotou Steel Group Co., Ltd., Baoshan SteelCorporation and Tianjin Steel Pipe Group Co., Ltd.in China.With many ...