Low in reactor creep zr-base alloy tubes

Details Low in reactor creep zr-base alloy tubes Low in reactor creep zr-base alloy tubes

C - Chemistry, Metallurgy

22

C

75/53, 148/35.7

C22C 16/00 (2006.01) C22F 1/18 (2006.01)

Patent

CA 1163120

ABSTRACT A process for fabricating tubes from a quaternary 3.5% Sn, 1%Mo, 1% Nb balance Zr alloy by hot extrusion, cold working and heat treatment so that the tubes have small grains that have low dislocation densitics. The tubes are superior to the standard cold worked Zr-2.5wt% Nb tubes because during service in CANDU-PHW reactors they (a) have lower axial elonga- tion and diametral expansion and (b) the hydrides are less susceptible to reorientation from the circumferential-axial plane into the radial-axial plane.

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