Patent ID: 6863313

Claim:
A workpiece for use in making a corrosion-resistant, threaded tubular member, comprising: an outer metal tube of corrosion-prone material having a first end, a second end, and an inner surface, a first ring of corrosion-resistant material secured to said first end of said metal tube and having a first ring end surface axially spaced from said metal tube and an outwardly facing, annularly extending, thread free pin shoulder, a first annular securing locus formed between said first ring and said first end of said metal tube, an inner metal tubular lining of corrosion-resistant material disposed in said outer tube, said metal lining having a first end, a second end, and an outer surface, said outer surface of said lining overlying said inner surface of said tube, said first end of said lining being secured to said first ring at a second annular securing locus axially spaced from both said first annular securing locus and said first ring end surface.