high strength and corrosion resistant tubing; and corrosion resistant high strength pipe fabrication process

摘要

summary high strength and corrosion resistant tubing; and corrosion resistant high strength pipe fabrication process corrosion resistant high strength pipe comprises about 35 to about 55% ni, about 12 to about 25% cr, about 0.5 at about 5% by weight, up to about 3% by weight, about 2.1 to about 4.5% at nb, about 0.5 to about 3% by weight, about 0.05 at about 1.0% wt, about 0.005 to about 0.04 wt%, and balance is more incidental and deoxidizing impurities. The pipe composition also satisfies the equation: (nb - 7.75 c) / (al + ti) = about 0.5 to about 9. A pipe fabrication process includes: alloy extrusion to form a pipe; cold work of extruded pipe; annealing of cold worked pipe; and applying at least one time hardening step to the annealed pipe. another process includes extruding the alloy at a temperature of about 1121 ° C or less; annealing of extruded pipe; and applying at least one time hardening step to the annealed pipe.