Hunan Shinestar Steel Group(HSSG) was found in 1987 and It's the predecessor of branch of China's Oil and Gas pipeline science research institute, as the most authoritative pipeline engineering research institute, consist of institute and eight linepipe bureau postdoctoral research stations. The main pipeline products and range dimension as follow: Carbon/ Alloy seamless steel pipe (Hot finish OD: 2"-36",Cold drawn OD: 0.875"-4.5") Stainless Smls/Weld steel pipe (OD：0.236"-36") ERW/LSAW/DSAW/SSAW steel pipe (OD：0.236"-123") OCTG, Casing, Tubing, Drill pipe (Casing: OD: 4 1/2” – 20”, Tubing: OD: 2 3/8”-4 1/2”)