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.
ASTM A517 GRADE S steel work/steel structure/steel machining parts is made by steel plate, in Shanghai KUNFENG’s processing center, we can do all kinds of steel processing work, cover welding, cutting, milling, shot blasting, etc.