Main feature: A. The drill rods comply with the provisions of API SPEC 5D & API SPEC7. B. The grade of steel are determined according to the requirements of Group
1 & Group 3 of API SPEC 5D. C. Drill pipe joints at the same level comply with the provisions under the Standard
API SPEC 7. Drill Pipe Feature: A. High precision in size and shape
B. Good low temperature toughness
C. Excellent comprehensive mechanical properties
D. High connection strength and sealability
E. Large inside diameter of tool joint
F. High torque resistance
G. High fatigue strength and long fatigue life
Internal Coating Feature: A.High abrasion resistance and low friction factor
B. Good adhesion and flexility
C. High application temperature and pressure
D. High hardness and impact resistance
E. Good corrosion resistance
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