seamless steel pipe we could supply you 200,300,400 and other series steel grade with different sizes. Feel free to contact us. seamless steel pipe1. Standard: GB/T14975-2002GB/14976-2002GB13296-94GB9948-88GB5310-95GB227080l.ASTMA213/A213-99a/ASTM312/A312M-OObASTMA269-00ASTMA511-96JISG3463JIS3446JIS3448JIS3459DIN2462DIN174852. Specification: 6-325×0.5-30mm3. Material Item(GB)(AISIASTM)(JIS)(BS)( ...