Drill String Cross-over Sub uses AISI4145H chromium-molybdenum steel, execute API specification.We can produce the same-dia type, reducers type and L-type three types, the screw can be cold thread rolling, copper or phosphate treatment.
The grade SCM432 is under the standard JIS G4053-2003. SCM432 is used to manufacture all kinds of engineering structures, such as building, bridge, shipping and car, ect.