Pipe joint

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/44 (2006.01) C22C 38/00 (2006.01) C22C 38/42 (2006.01) C22C 38/46 (2006.01) C22C 38/58 (2006.01) F16K 25/00 (2006.01) F16K 27/00 (2006.01) F16L 19/02 (2006.01) F16L 19/04 (2006.01) F16L 19/08 (2006.01)

Patent

CA 2491990

Pipe joint (30) comprising pipe-shaped body (31) in which pipe (32) is inserted from the rear end side; front ring (33) and back ring (34) fitted round portion of the pipe (32) protruding from the rear end side of the body (31); and cap nut (35) for tightening the front ring (33) and back ring (34) so as to fix the pipe (32) to the body (31). The back ring (34) is constituted of an alloy comprising, on the basis of weight %, 0.001 to 0.01% of C, 5% or less of Si, 2% or less of Mn, 0.03% or less of P, 100 ppm or less of S, 50 ppm or less of O, 18 to 25% of Cr, 15 to 25% of Ni, 4.5 to 7.0% of Mo, 0.5 to 3.0% of Cu and 0.1 to 0.3% of N, the remainder composed substantially of Fe and other unavoidable impurities.

L'invention concerne un joint (30) de conduit comprenant un corps (31) en forme de conduit dans lequel un conduit (32) est inséré par le côté d'extrémité arrière; une bague avant (33) et une bague arrière (34) placées autour d'une partie du conduit (32) dépassant du côté d'extrémité arrière du corps (31); et un écrou borgne (35) destiné à serrer la bague avant (33) ainsi que la bague arrière (34), de manière à fixer le conduit (32) au corps (31). La bague arrière (34) est constituée d'un alliage comprenant, sur la base d'un pourcentage en poids, 0,001 à 0,01 % de C, 5 % ou moins de Si, 2 % ou moins de Mn, 0,03 % ou moins de P, 100 ppm ou moins de S, 50 ppm ou moins de 0, 18 à 25 % de Cr, 15 à 25 % de Ni, 4,5 à 7,0 % de Mo, 0,5 à 3,0 % de Cu et 0,1 à 0,3 % de N, le reste étant constitué sensiblement de Fe et d'autres impuretés inévitables.

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