... /400 Seamless.welded,hot rolled,cold drawn,ERW ductile iron k9 tubeStandard: JIS, AISI, ASTM, GB, DIN, ENPlace of Origin: TIANJIN ... produce general purpose parts, cutting tools, mechanical parts, petroleum refining equipment, bolts and nuts, pump rods, and kitchenware. Inspection:Chemical Analysis ... supplied with shipment, Third Part Inspection is acceptable. ductile iron k9 tube