PIPE JOINT MADE OF STAINLESS STEEL AND METHOD OF MAKING THE SAME.

摘要

A pipe joint excellent in shape memory effect, made of stainless steel containing more than 10 % of chromium. The steel contains not more than 0.10 % of carbon, 3.0 to 6.0 % of silicon, 6.0 to 25.0 % of manganese, not more than 7.0 % of nickel, more than 10 to 17.0 % of chromium, 0.02 to 0.30 % of nickel, and 2.0 to 10.0 % of cobalt, and further contains, if necessary, one or more of 0.05 to 0.8 % of niobium, 0.05 to 0.8 % of vanadium, 0.05 to 0.8 % of zirconium, 0.05 to 0.8 % of titanium, not more than 2.0 % of molybdenum, and not more than 2.0 % of copper, wherein the proportions of the components are regulated in such a manner that no delta ferritic phase substantially appears in an annealed state. Since this joint is one treated to have such a shape memory effect that it will recover the memorized original shape with a smaller diameter when heated to an appropriate temperature, it can fasten pipes merely by heating. Furthermore, this joint is galvanized on its surface so as to improve the sealability in joining the pipes and prevent crevice corrosion from occurring at the interface between the joint and the pipe.