Patent ID: 8603269
Filing Date: 2013-12-10
Classification: B21C,C21D,C22C,C22F,E21B

Abstract:
1. A method of fabrication of corrosion resistant tubular having a minimum tensile strength of 65-ksi comprising: selecting a low-cobalt, non-ferromagnetic nickel alloy blank selected from a group of nickel alloys consisting of: N06625, N07716, and N06985, having a mass and a longitudinal extent sufficient to create a tubular in a standard oilfield length; forming a hole in the longitudinal axis of said blank to create a tubular; increasing the grain size of the low-cobalt, non-ferromagnetic nickel alloy of the tubular by heating the tubular and by water quenching; cold working the tubular; heat treating by a non-oxidizing annealing and water quenching the tubular to increase a grain size of the tubular member toward ASTM Grain Size No. of 0 to permit machining; and, machining the tubular to form a final product.