HIGH-STRENGTH CORROSION-RESISTANT TUBING FOR OIL AND GAS COMPLETION AND DRILLING APPLICATIONS, AND PROCESS FOR MANUFACTURING THEREOF

摘要

The present invention is Ni about 35 to about 55% by weight, Cr about 12 to about 25% by weight, Mo about 0.5 to about 5% by weight, Cu about 3% by weight or less, Nb about 2.1 to about 4.5% by weight, Ti about 0.5 to about It relates to a high strength corrosion-resistant piping comprising about 3% by weight, about 0.05 to about 1.0% by weight Al, about 0.005 to about 0.04% by weight C, residual amounts of Fe and incidental impurities and deoxidizers. The composition also satisfies the formula (Nb-7.75C)/(Al+Ti) = about 0.5 to about 9. The manufacturing method of the piping includes extruding the alloy to form the piping; Cold-working the extrusion pipe; Annealing the cold worked piping; And applying one or more age hardening steps to the annealing piping. Another method is extruding the alloy at a temperature of about 2050° F. or lower; Annealing the extrusion pipe; And applying one or more age hardening steps to the annealing piping.