Patent ID: 6273477
Filing Date: 2001-08-14
Classification: C22C,F16L,Y10S

Abstract:
A pipe joint comprising a pair of tubular joint members, an annular gasket interposed between opposed end faces of the two joint members, and threaded means for joining the two joint members, the pipe joint being characterized in that each of the joint members is prepared from a stainless steel having a surface with a Vickers hardness of at least 300, the gasket being prepared from a stainless steel comprising, in radio by weight, 12.90 to 15.00% of Ni, 16.50 to 18.00% of Cr, 2.00 to 3.00% of Mo, up to 0.02% of C, up to 0.30% of Si, up to 0.40% of Mn, up to 0.03% of P, up to 0.003% of S, up to 0.25% of Cu and up to 0.01% of Al, the gasket having a surface with a Vickers hardness of 90 to 160, such that flaws are prevented from developing in the opposed end faces of said two joint members upon repeated disassembly and reassembly of the two joint members when said gasket is interposed between the opposed end faces.