... 2. K7&K9&K8 3.ling according to ISO4179 ductile iron socket spigot pipe Standard: JIS, AISI, ASTM, GB, DIN, ENPlace ... Number: 200 300 400 600Type: SeamlessSteel Grade: 300 SeriesApplication: medichine,food, machine,industry,Certification: ISOWelding Line Type: ERWThickness: 0.5mm-40mmOuter Diameter ... is supplied with shipment, Third Part Inspection is acceptable. ductile iron socket spigot pipe