Tianjin City Tian Yi Seamless Steel Tube Manufacturing Co., Ltd is a factory that specializes in seamless steel pipes, located in Tianjin, covers 66700 square meters area, gross investment 93 million, permanent assets occupy 63 million. We are specialized in manufacturing seamless carbon steel and alloy steel tubes complying with the specifications GB, ASTM, API 5L, API 5CT, JIS, DIN, and BS. The annual output are over 100,000MT, annual sales revenue 650 million. The dimension is with outside diameter of 16mm - 1016mm and wall thickness of 5-36mm. Our products are widely used in petrochemical, machinery, shipyard, power station, boiler, and heat exchanger. Our main manufacturing equipment include gasogene stoves,dim:14.5 circular heating stoves, punch machines, A-R stretched machines, vertical straightening machines and so on. circular heating stoves possess many merits, such as symmetrical temperature when heating, lower energy source and metal consuming and so on; billet perfora