Sntai Group .is a large and comprehensive enterprise engaging in manufacture of oil and petrochemical equipment. In August 2004, it was reformed from General Engineering Machinery Factory of China Petroleum Administrative Bureau, Sinopec Group, which was founded in 1964. It mainly deals with such activities as petroleum equipment manufacture, special purpose vehicles refit, pipelines production and so on. Its working areas are largely distributed in Dongying city , Qingdao city ,and Zibo City .we mainly produce Tubing and casing in accordance with API 5CT .