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.
DD11 steel machining parts Industry application: DD11 steel can be processed as the automobile chassis, automotive frame, automobile rim, automobile bumper ,and other small parts of the car interior.