api 5l mild steel tubes suppliers Tianjin Ruijie Steel Pipe Co.,Ltd is located in Cuizhuangzi Industrial Park, Tianjin, China, covering a total area of 48,800 square meters, the existing staff 260 People, including senior engineering and technical personnel 36 people.Quality inspection personnel and welding workers have been ****essed by specialized agencies, special types of employment rate of 100%, so that the quality of products has been guaranteed. Tianjin Huaruitai International Trading Co.,Ltd. Is a subsidiary of Ruijie Group. http://www.ruijiesteelpipes.com/