We are Run Delong, company specializing in producing small and large diameter of rectangular and square steel pipe. Established in 2005, we supply high quality products which are known for their durability. Our company has passed ISO9001 national security management system certification, ISO14001 environment management system certification and OHSAS18001 occupational health and safety management system certification. Our company execute China petroleum and natural gas SY/T series standard 、national standard GB/T 23257、DIN 30670、Canada and AWWA standard and China Ministry of Construction CJ114 、CJ115 standard and so on . We are located in the industrial area of Daqiuzhuang county in Tianjin, the wellknown city in industry in China. We have adequate resources for transportation and we enjoy the reputation of honor the delivery times.