API High Quality Drill Collar

We are offering api high quality drill collar.
1. Material: non magnetic steel
2. Shape: it is the round pipe with smooth surface and thick wall, and the both ends are machined screw thread for connection.
3. Use: it is mainly used for the inspection in the process of petroleum drilling.
4. Standard: api spec 7-1 or syt5144 standard.
5. Inspection&test: when producing, traceability are maintained from the receipt of raw material to completion of final products, and serial numbers are die-stamped on each workpiece body. During each manufacturing process, inspection and test are performed.
6. Magnetic permeability(mps=1×1054∏am)
1). Average: ur.
2). Magnetic field gradient: δb≤0.05μt.