Drill Pipe,Drill Collar

Drill Pipe: Designed and manufactured according to API SPEC. 5D, API SPEC. 7 Tube steel: API SPEC. 5D, Group 1, Group 3(Group 1-Grade E, Group 3- X95, G105, S135) The matching tool joints conform to API SPEC.7, selected according to your requirementsting

DRILL COLLARS: The collars are made of AISI 4145H forging or finish rolling alloy structural steel and conform to API Spec 7. Grinding crafts adopted finish boring technology eliminates regions of the weld stress concentration, making welding appearance more perfect, and increases their life.

The full length thermal treatment ensures the mechanical performances and fulfills even exceed API Spec 7 requirements. Its brinell hardness ranges from 285 to 341, moreover, charpy “v” notch minimum impact strength of 40 ft-lb at 15-25 ℃ are guaranteed one inch below the surface.