... ASTM A213 T91 alloy tubeWe are Tianjin BoReiXiang Steel Pipe Sales Co., Ltd.-----American Petroleum Institute:Certificate of Authority ... Our products are widely used in petrochemical, transport gas,machinery, shipyard, power station, boiler and heatexchanger. As ... Chengdu Steel Group Co., Ltd., Baotou Steel Group Co., Ltd., Baoshan SteelCorporation and Tianjin Steel Pipe Group Co., Ltd.in China.With ...