Heavy-Duty Thick-Walled Drill Pipes with 1-Year Warranty

Warranty period - 1 year. Service life is 4 yrs. Average MTBF 400 screws - unscrews.

Average life before the first re-cutting is not less than 3000 hours, including re-cutting not less than 18000 hours. Mechanical properties: TBT and TBTP with diameter of coupling and nipple dropouts up to and including 175 mm Tensile strength not less than 965 MPa Yield strength not less than 758 MPa; Relative elongation not less than 13% Impact toughness KCU value not less than 600 J/sq. m Impact work KV value not less than 54 J TBT and TBTP with socket and nipple diameters over 175 mm Tensile strength not less than 931 MPa Yield strength not less than 689 MPa; Relative elongation not less than 13% Impact toughness KCU value not less than 600 J/sq.

m Impact work KV value not less than 54 J The hardness of TBT pipes shall be 302...364HB at a length of at least 550mm from the ends and 285...364HB at the rest of the pipe. The hardness of TBTP pipes shall be 302...364HB at a length of at least 200mm from the ends and 285...364HB on the rest of the pipe.