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.
ABS Grade D shipbuilding Steel plate is a common tensile strength steel . .ABS Grade D shipbuilding Steel plate is the Hull structural steel which with a good toughness properties, higher strength,strong corrosion-resistance,the processing properties,and