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.
KUNFENG has JIS G4304 SUS420J1 MARTENSITIC stainless steel plate/coil on sale .JIS G4304 SUS420J1 is a kind of MARTENSITIC stainless steel plate/coils. And JIS G4304 SUS420J1 MARTENSITIC stainless steel plate/coil is popular in the world.
18Cr2Ni4WA can also be used in not carburizing and using the qualitative case and 18Cr2Ni4WA is generally used for important parts with larger cross section, high load and good toughness and low notch sensitivity.