1.Standard:API,ASTM,JIS,DIN,GB,EN,BS. 2.Certification: ... , ASTM A252, GR.B TO X70, GR.1 GR.2 GR.3 OD: 219.1 - 4064mm (8" - 160") WT: 3.2 - 25 ... , L290, L320, L360, L390, L415, L450, L485, L555ASTM A252: Gr.1 Gr.2 Gr.3Size range:welded steel pipeOuter Diamter: 219 ... :EN 10204/3.1BThird party inspection:SGS, BV, Lloyds etc. ERW welded steel pipe