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.
20MnV alloy structural steel under GB/T 3077 chinese standard, can be produced into hot rolled round bars and square bars, cold-drawing bars,forged bars. We henan KUNFENG can supply GB/T 3077 20MnV all of shapes.
X10CrMoVNb9-1 steel structure contains super higher chromium in heat analysis at 8.00-9.50%. Therefore, X10CrMoVNb9-1 steel structure owns special property for resistance of atmospheric corrosion and oxidization.