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.
Additional technical: As your wish, we can provide you ASTM A131 AH32 Steel Structural in AR, CR, TMCP, N or QT Heat treatment, PWHT, UT, Low Temperature Impacting Test, HIC and so on.