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A corrosion-resistant threaded connection including a first tubular member having an outer metal tube of corrosion-prone material and an inner metal lining of corrosion-resistant material, the first tubular member forming a pin connection having a nose portion comprising a ring of corrosion-resistan

A corrosion-resistant threaded connection including a first tubular member having an outer metal tube of corrosion-prone material and an inner metal lining of corrosion-resistant material, the first tubular member forming a pin connection having a nose portion comprising a ring of corrosion-resistant material secured, e.g., welded, to the tube of corrosion-prone material, a radially outwardly facing, annularly extending thread-free first pin shoulder being formed on the corrosion-resistant ring, the first member including an externally threaded portion providing male threads, and a second tubular member comprising a metal coupling having a first end and a second end and forming a first box connection and a second box connection, respectively, the coupling including an internally disposed annularly extending metal section of corrosion-resistant material disposed intermediate the ends of the coupling, each of the box connections comprising a radially inwardly facing, annularly extending box shoulder formed on the section of corrosion-resistant material, each of the box connections further including a threaded female portion having threads complementary to the male threads, the pin and box shoulders being sized and configured such that when first and second of the first tubular members are threadedly received in the first and second box connections, respectively, the pin and box shoulders are in metal-to-metal sealing engagement.

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[ What is claimed is:] [1.] A corrosion-resistant threaded connection assembly comprising:a first tubular member comprising an outer metal tube of corrosion-prone material and an inner metal lining of corrosion-resistant material, said first tubular member comprising a pin connection, said pin conne

[ What is claimed is:] [1.] A corrosion-resistant threaded connection assembly comprising:a first tubular member comprising an outer metal tube of corrosion-prone material and an inner metal lining of corrosion-resistant material, said first tubular member comprising a pin connection, said pin connection comprising a nose portion comprising a ring of corrosion-resistant material secured to said tube of corrosion-prone material, forming an annular securing locus, said ring defining an annular, axially facing end surface, said pin connection further including a radially outwardly facing, annularly extending thread-free pin shoulder formed on said corrosion-resistant ring and an axially extending, externally threaded portion providing male threads and extending axially inwardly of said pin shoulder, said securing locus being disposed intermediate said end surface and the end of said externally threaded portion distal said end surface;a second tubular member comprising a metal coupling having a first end and a second end, said coupling having a first box connection formed in said first end and a second box connection formed in said second end, said coupling including an internally disposed, annularly extending section of corrosion-resistant material disposed intermediate said first and second ends of said coupling, each of said box connections comprising a radially inwardly facing, annularly extending box shoulder formed on said section of corrosion-resistant material, each of said box connections further including an axially extending, internally threaded portion providing female threads complementary to said male threads and extending axially outwardly of said thread-free box shoulder; andsaid pin and box shoulders being sized and configured such that when first and second of said pin connections are threadedly received in said first and second box connections, respectively, said pin and box shoulders are in metal-to-metal sealing engagement, at least a portion of the first one of said male threads being formed on said ring of corrosion-resistant material.