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.
NK DH40 shipbuilding steel plates are mainly used for making the offshore oil drilling platform, the hull of ship building and ship repairing, the platform pipe joints and other components.
GB/T 18254 GCr15SiMn stainless steel belongs to bearing stell. Compared with GB/T 18254 GCr15, GCr15SiMn has better abrasive resistance. GCr15SiMn round bars can be used for manufacturing large size bearing,running pulley and so on.
TB/T 1979 is Chinese standards. TB/T 1979 05CuPCrNi whether resistant steel plate has the same strong corrosion resistance as American Standard Weathering Steel. .