1.size:3"-36" 2.standard:API/JIS/DIN/ASTM/EN 3.material:API5LGR. ... /ST52 4.Certificate:API/CE/ISO 5.zhonghai steel 6"-36" carbon steel pipeDear ,This is Julia here from China he ... check the details as follows :1.Seamless pipe Size: 6”- 36”(168mm-914mm)Standard: GB/API/ASTM/EN/DIN/JIS/GOSTMaterial ... , pls do not hesitate to contact me .Best wishes, 6"-36" carbon steel pipe