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.
GL DH32 shipbuilding steel plate is a kind of hot rolled high tensile strength steel. Higher-strength GL shipbuilding steel comes in 12 grades of 3 strengths, GL DH32 shipbuilding steel plate is one of the grades.