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.
We mainly produce DIN 17175 ST35.8, DIN 17175 ST45.8, and 10CrMo910 steel pipes. DIN17175 ST35.8 steel pipe is our star produce. KUNFENG put DIN17175 ST35.8 steel pipe on the very important position.
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.