| 摘要 |
PURPOSE:To improve corrosion resistance to water and steam having a high temp. and high pressure in the stage of forming a Zr alloy by >=2 stages of cold plastic working to a pipe or bar shape by subjecting the alloy to a specific heat treatment during course of the cold plastic working or after the final cold plastic working. CONSTITUTION:A Zr alloy material is worked to a pipe material or bar material by >=2 times of cold plastic working in the stage of producing a pipe or bar material of a corrosion resistant Zr alloy to be used in water or steam having a high temp. and high pressure as a structure of a nuclear plant. A part 2 made of the Zr alloy is put into a heating furnace 1 during the course of the cold plastic working stage or after the final cold plastic working, then the top and bottom ends thereof are fixed by restraining parts 7 and electricity is conducted thereto to heat the part in a temp. region of the beta phase or (alpha+beta) phase of the Zr alloy. Cooling water is thereafter ejected from many cooling nozzles 13 provided to the outside cylinder 12 of the heating furnace and in the case of the pipe material, inert gas such as Ar is passed in the pipe to cool quickly the pipe, whereby the corrosion resistance of the part 2 is improved. |
